SWAT teams with Major Crimes for a high-stakes mission to extract an undercover officer from a dangerous crime ring.

When a mystery woman attacks the founder of an AI company, the NCIS team must identify her before the next major global conflict ensues; Kilbride's ex-wife comes to visit and asks him to think about reconnecting with their son.

When a petty officer is found dead with an apparent suicide note, the NCIS team must investigate the mystery surrounding his death; Callen and Anna begin wedding planning; Sam has a heart-to-heart with his daughter.

Mike, Frank and Danielle hang out with music legends and Rock & Roll Hall of Famers while digging for vintage guitars, music memorabilia and more.

Jimmy is sent to a mining camp to build an ice landing strip for a DC-3 and a C-46.

Engine troubles force Devan to shut down an engine.

Kevin and his wife Sarah take on a special order; they need to find a one-in-a-million fir tree for a sailing school that is rebuilding a rare replica of a 1778-era schooner.

Logger Kevin Wenstob finds himself in a battle of wills against an opposing crew trying to thwart his plans to expand his sawmill.

Three stories of men willing to take risks to escape the cold, dark cells of "the Rock"; six convicts organize a jailbreak; three men attempt an elaborate breakout.

On ADX, "Alcatraz of the Rockies" located in Florence, Colorado, Ishmael Petty attacks the staff; Tommy Silverstein finds a way to communicate with Ramzi Youssef; an inmate starves himself to protest the prison's policies.

When a mystery woman attacks the founder of an AI company, the NCIS team must identify her before the next major global conflict ensues; Kilbride's ex-wife comes to visit and asks him to think about reconnecting with their son.

When a petty officer is found dead with an apparent suicide note, the NCIS team must investigate the mystery surrounding his death; Callen and Anna begin wedding planning; Sam has a heart-to-heart with his daughter.

The team races to stop a gunman who is targeting rehab centers and those he considers responsible for his brother's death; Deacon is caught off guard when his wife makes a parenting decision that has unexpected consequences for their daughter.

The team races to stop a violent rampage with ties to a painful chapter from Hicks' past.

SWAT teams with Major Crimes for a high-stakes mission to extract an undercover officer from a dangerous crime ring.

Matty Blake joins the Fellowship to recount the highs and lows of the longest treasure hunt in history, and shines a light on how far the team has come.

During World War II, the Nazi war machine creates specialized death camps; at Sobibor, in Poland, a small group of Jews engineer a mass escape and help bring the story of the Holocaust to the rest of the world.

Three stories of men willing to take risks to escape the cold, dark cells of "the Rock"; six convicts organize a jailbreak; three men attempt an elaborate breakout.

On ADX, "Alcatraz of the Rockies" located in Florence, Colorado, Ishmael Petty attacks the staff; Tommy Silverstein finds a way to communicate with Ramzi Youssef; an inmate starves himself to protest the prison's policies.

Have you ever wondered about the most bizarre things that have fallen from the sky? From meteorites to seafood, and even bathtubs, these are some truly unbelievable stories of what comes from above. Don't believe it? Just look up!

Just ahead of the Season 12 premiere, Alex Lagina and Jack Begley give Matty Blake a taste of the thrilling discoveries that were made during this year's search for the Oak Island treasure.

After last year's devastating flood in the garden shaft, Rick, Marty and the fellowship return to Oak Island with renewed confidence and immediately discover a never before known shaft, which may finally lead them directly to the Money Pit.

Have you ever wondered about the most bizarre things that have fallen from the sky? From meteorites to seafood, and even bathtubs, these are some truly unbelievable stories of what comes from above. Don't believe it? Just look up!

Just ahead of the Season 12 premiere, Alex Lagina and Jack Begley give Matty Blake a taste of the thrilling discoveries that were made during this year's search for the Oak Island treasure.

After last year's devastating flood in the garden shaft, Rick, Marty and the fellowship return to Oak Island with renewed confidence and immediately discover a never before known shaft, which may finally lead them directly to the Money Pit.

Three stories of men willing to take risks to escape the cold, dark cells of "the Rock"; six convicts organize a jailbreak; three men attempt an elaborate breakout.

On ADX, "Alcatraz of the Rockies" located in Florence, Colorado, Ishmael Petty attacks the staff; Tommy Silverstein finds a way to communicate with Ramzi Youssef; an inmate starves himself to protest the prison's policies.

Just ahead of the Season 12 premiere, Alex Lagina and Jack Begley give Matty Blake a taste of the thrilling discoveries that were made during this year's search for the Oak Island treasure.

At the site of a 19th century country church that has reached the end of its life, the salvage team plans to delicately extract fragile stained-glass windows and 200-year-old pine beams, but things quickly go sideways.

Mike fixes a 1961 Cadillac to showcase and smash to pieces at Rust Valley's annual Demolition Derby; mechanic Dave enters a 1974 Chrysler New Yorker for the big event.

Moe brings the team to the scene of one of his most terrifying previous investigations.

At the site of a 19th century country church that has reached the end of its life, the salvage team plans to delicately extract fragile stained-glass windows and 200-year-old pine beams, but things quickly go sideways.

Mike fixes a 1961 Cadillac to showcase and smash to pieces at Rust Valley's annual Demolition Derby; mechanic Dave enters a 1974 Chrysler New Yorker for the big event.

The dogs are brought in to assist officers; A traveler goes gaga at Vancouver International Airport.

Officers question a nervous traveler; a trampoline installer hopes to avoid the bounce around; undeclared dogs from Hungary.

Hawkeye and Charles set out to test the crew's gullibility when they announce that Marilyn Monroe is due to arrive.

Mildred writes a letter to Hawkeye; and a sergeant tries to kill the captive sniper responsible for his lieutenant's injuries.

Sam and Kilbride clash when a case involving an arms dealer responsible for the slaughter of ATF agents leads them to a well-connected colonel and friend of Kilbride; Kensi and Fatima go under cover to question the arms dealer's girlfriend.

When a misconduct complaint filed against Hondo gets him taken off active duty, Deacon steps up to lead the team in finding a robbery crew that is hitting marijuana dispensaries.

A holy relic from the Bible has been missing for over 2,000 years; while some believe the Ark of the Covenant was destroyed, many people think it's still out there; new clues could finally explain what happened.

The haunting image of the Shroud of Turin has captivated millions around the world; scientists and theologians are trying to figure out if the Shroud of Turin truly is an image of Jesus or something very different.

Hawkeye and Charles set out to test the crew's gullibility when they announce that Marilyn Monroe is due to arrive.

Mildred writes a letter to Hawkeye; and a sergeant tries to kill the captive sniper responsible for his lieutenant's injuries.

When a misconduct complaint filed against Hondo gets him taken off active duty, Deacon steps up to lead the team in finding a robbery crew that is hitting marijuana dispensaries.

After last year's devastating flood in the garden shaft, Rick, Marty and the fellowship return to Oak Island with renewed confidence and immediately discover a never before known shaft, which may finally lead them directly to the Money Pit.

France shipped prisoners to Devil's Island located off French Guiana so they would vanish from the public eye; Alfred Dreyfus, is a military officer convicted of crimes he didn't commit.

In the heart of the Confederacy, Andersonville was the last place a Union soldier wanted to end up during the Civil War; only opened for 14 months, becoming the final resting place for over 12,000 men.

Two previous champions will face off in a grueling five-hour challenge, making a blade inspired by Hollywood for the chance to duke it out against one of the titans of the forge.

The haunting image of the Shroud of Turin has captivated millions around the world; scientists and theologians are trying to figure out if the Shroud of Turin truly is an image of Jesus or something very different.

France shipped prisoners to Devil's Island located off French Guiana so they would vanish from the public eye; Alfred Dreyfus, is a military officer convicted of crimes he didn't commit.

In the heart of the Confederacy, Andersonville was the last place a Union soldier wanted to end up during the Civil War; only opened for 14 months, becoming the final resting place for over 12,000 men.

Two previous champions will face off in a grueling five-hour challenge, making a blade inspired by Hollywood for the chance to duke it out against one of the titans of the forge.

A holy relic from the Bible has been missing for over 2,000 years; while some believe the Ark of the Covenant was destroyed, many people think it's still out there; new clues could finally explain what happened.

The haunting image of the Shroud of Turin has captivated millions around the world; scientists and theologians are trying to figure out if the Shroud of Turin truly is an image of Jesus or something very different.

When a misconduct complaint filed against Hondo gets him taken off active duty, Deacon steps up to lead the team in finding a robbery crew that is hitting marijuana dispensaries.

Sam and Kilbride clash when a case involving an arms dealer responsible for the slaughter of ATF agents leads them to a well-connected colonel and friend of Kilbride; Kensi and Fatima go under cover to question the arms dealer's girlfriend.

A sweet opportunity pushes Justin to re-evaluate his place on the salvage team. At a century-old theatre that has been empty for over a decade, Ted uncovers a treasure trove of World War I artefacts, including a vintage compass and bayonet.

Mike restores a 1938 International Harvester; the shop holds a swap meet; wedding bells ring for Greg.

On a trip to the Deep South, Moe and his team visit a giant limestone cave that is the namesake of this haunted town.

A sweet opportunity pushes Justin to re-evaluate his place on the salvage team. At a century-old theatre that has been empty for over a decade, Ted uncovers a treasure trove of World War I artefacts, including a vintage compass and bayonet.

Mike restores a 1938 International Harvester; the shop holds a swap meet; wedding bells ring for Greg.

Customs and immigration officials work to protect their borders.

Officers get the dope on a traveler's rap sheet; A passenger is unsure of his luggage contents.

B.J. attempts to pull off the ultimate practical joke on Hawkeye.

Father Mulcahy agrees to offer his running abilities in a race that pits the 4077th against the 8063rd.

As Callen continues hunting Katya, Kilbride enlists NCIS to help find a truckload of stolen guns; the assignment becomes more challenging when their suspect is found dead.

The SWAT team tries to rescue civilian hostages during a prison riot; Hondo suspects an ulterior motive behind the uprising; Deacon's wife stops by the headquarters to celebrate Deacon's 10th anniversary with the SWAT division.

As the post-war baby boom creates unprecedented demand for toys, Ruth Handler turns her greatest gamble into the most recognizable toy in the world.

Milton Bradley creates one of America's first board games, but the Parker brothers threaten Bradley's reign.

B.J. attempts to pull off the ultimate practical joke on Hawkeye.

Father Mulcahy agrees to offer his running abilities in a race that pits the 4077th against the 8063rd.

The SWAT team tries to rescue civilian hostages during a prison riot; Hondo suspects an ulterior motive behind the uprising; Deacon's wife stops by the headquarters to celebrate Deacon's 10th anniversary with the SWAT division.

France shipped prisoners to Devil's Island located off French Guiana so they would vanish from the public eye; Alfred Dreyfus, is a military officer convicted of crimes he didn't commit.

In the heart of the Confederacy, Andersonville was the last place a Union soldier wanted to end up during the Civil War; only opened for 14 months, becoming the final resting place for over 12,000 men.

Two previous champions will face off in a grueling five-hour challenge, making a blade inspired by Hollywood for the chance to duke it out against one of the titans of the forge.

Lunchtime is one of the most enjoyable meals of every kid's day, but before the 1960s it was just another meal; then, three very different food visionaries take matters into their own hands.

Brothers Rick and Marty Lagina are closer than ever to solving the mystery.

Milton Bradley creates one of America's first board games, but the Parker brothers threaten Bradley's reign.

Lunchtime is one of the most enjoyable meals of every kid's day, but before the 1960s it was just another meal; then, three very different food visionaries take matters into their own hands.

Brothers Rick and Marty Lagina are closer than ever to solving the mystery.

As the post-war baby boom creates unprecedented demand for toys, Ruth Handler turns her greatest gamble into the most recognizable toy in the world.

Milton Bradley creates one of America's first board games, but the Parker brothers threaten Bradley's reign.

The SWAT team tries to rescue civilian hostages during a prison riot; Hondo suspects an ulterior motive behind the uprising; Deacon's wife stops by the headquarters to celebrate Deacon's 10th anniversary with the SWAT division.

As Callen continues hunting Katya, Kilbride enlists NCIS to help find a truckload of stolen guns; the assignment becomes more challenging when their suspect is found dead.

It's all hands on deck as some of Priestly's top buyers arrive at the yard; Ted closes one of his biggest sales of the year when he finally locks down a buyer for the plane fuselage; a practical joke is plotted at Ted's expense.

Mike restores a 1941 Ford Super Deluxe and a 1964 Ford Fairlane 500; a natural disaster threatens the shop.

Amidst the amusement parks of Central Florida, Moe and his team investigate a popular escape room attraction where the owners are plagued by supernatural phenomena that no one can explain.

It's all hands on deck as some of Priestly's top buyers arrive at the yard; Ted closes one of his biggest sales of the year when he finally locks down a buyer for the plane fuselage; a practical joke is plotted at Ted's expense.

Mike restores a 1941 Ford Super Deluxe and a 1964 Ford Fairlane 500; a natural disaster threatens the shop.

Suspicious x-rays; an MMA fighter's story; an RV search that reveals unusual weapons; a cross-border car sale.

A businesswoman's personal items sound alarms; a cargo ship crew member who has been concealing in the ceiling; a puppeteer couple; an American seeking legal advice in Ontario.

Three United Nations delegates visit: a physician who is similar to Charles, an Army officer who teaches yoga and a Swede who catches Margaret's attention.

Charles refuses to solve his annoying snoring problem; Potter's son-in-law visits with some shocking news.

When an NCIS mission to protect a compromised undercover agent goes completely sideways, the agents are individually interrogated to find out what really happened; Kilbride must make a difficult decision.

Hondo teams up with an old DEA friend to unmask the secret leader of a drug smuggling ring; Jessica begins implementing her new law enforcement community initiatives.

Rick, Corey and Chum end their road trip in the Old Man's hometown of Winston-Salem, N.C., where they hope to make some sweet Carolina deals; the trio check out antique tractors, test fire weapons at the range, and hang with a NASCAR racing legend.

Leavenworth located 25-miles northwest of Kansas City, was the largest maximum-security federal prison in the United States for over a hundred years; Carl Panzram, Robert Stroud and Tommy Silverstein share stories of life behind its walls.

Attica, a 90-year-old maximum-security prison in upstate New York, has a legacy of violence and inmate abuse stretching back decades; stories include the serial killer Son of Sam who gets his throat slashed, a successful escape, and a riot.

Three United Nations delegates visit: a physician who is similar to Charles, an Army officer who teaches yoga and a Swede who catches Margaret's attention.

Charles refuses to solve his annoying snoring problem; Potter's son-in-law visits with some shocking news.

Hondo teams up with an old DEA friend to unmask the secret leader of a drug smuggling ring; Jessica begins implementing her new law enforcement community initiatives.

Brothers Rick and Marty Lagina are closer than ever to solving the mystery.

Leavenworth located 25-miles northwest of Kansas City, was the largest maximum-security federal prison in the United States for over a hundred years; Carl Panzram, Robert Stroud and Tommy Silverstein share stories of life behind its walls.

Attica, a 90-year-old maximum-security prison in upstate New York, has a legacy of violence and inmate abuse stretching back decades; stories include the serial killer Son of Sam who gets his throat slashed, a successful escape, and a riot.

Sinaloa and its leader El Chapo aim to become the world's largest drug trafficking organization, but their success is threatened by the Tijuana Cartel, and U.S. and Mexican authorities.

When John Gotti, a capo from the Bronx, becomes fed up with the greed of his boss, Paul Castellano, he orchestrates a mob hit; rising to power as the new don of the Gambino family, Gotti's reign draws the scrutiny of the FBI.

Pablo Escobar's Medellin Cartel become powerful cocaine traffickers; when they go to war with Colombia, the cartel tests their limits.

Oakland Hells Angels president, Sonny Barger, transforms the club into an organized crime syndicate and creates a blueprint for outlaw biker clubs to follow; federal authorities strike at the club, employing the RICO statute.

Leavenworth located 25-miles northwest of Kansas City, was the largest maximum-security federal prison in the United States for over a hundred years; Carl Panzram, Robert Stroud and Tommy Silverstein share stories of life behind its walls.

Attica, a 90-year-old maximum-security prison in upstate New York, has a legacy of violence and inmate abuse stretching back decades; stories include the serial killer Son of Sam who gets his throat slashed, a successful escape, and a riot.

Sinaloa and its leader El Chapo aim to become the world's largest drug trafficking organization, but their success is threatened by the Tijuana Cartel, and U.S. and Mexican authorities.

When John Gotti, a capo from the Bronx, becomes fed up with the greed of his boss, Paul Castellano, he orchestrates a mob hit; rising to power as the new don of the Gambino family, Gotti's reign draws the scrutiny of the FBI.

Pablo Escobar's Medellin Cartel become powerful cocaine traffickers; when they go to war with Colombia, the cartel tests their limits.

Oakland Hells Angels president, Sonny Barger, transforms the club into an organized crime syndicate and creates a blueprint for outlaw biker clubs to follow; federal authorities strike at the club, employing the RICO statute.

Sinaloa and its leader El Chapo aim to become the world's largest drug trafficking organization, but their success is threatened by the Tijuana Cartel, and U.S. and Mexican authorities.

When John Gotti, a capo from the Bronx, becomes fed up with the greed of his boss, Paul Castellano, he orchestrates a mob hit; rising to power as the new don of the Gambino family, Gotti's reign draws the scrutiny of the FBI.

Rick, Corey and Chum end their road trip in the Old Man's hometown of Winston-Salem, N.C., where they hope to make some sweet Carolina deals; the trio check out antique tractors, test fire weapons at the range, and hang with a NASCAR racing legend.

Hondo teams up with an old DEA friend to unmask the secret leader of a drug smuggling ring; Jessica begins implementing her new law enforcement community initiatives.

When an NCIS mission to protect a compromised undercover agent goes completely sideways, the agents are individually interrogated to find out what really happened; Kilbride must make a difficult decision.

In the season premiere, Ted takes the plunge with his own new salvage business and hits the ground running at an abandoned wrecking yard that may be holding hidden treasures.

Connor restores a 1967 Chevy II behind Mike's back; Mike installs an engine in a 1964 Ford F100 truck.

At the site of the infamous Salem Witch Trials, Moe and his team encounter a famous local spirit.

In the season premiere, Ted takes the plunge with his own new salvage business and hits the ground running at an abandoned wrecking yard that may be holding hidden treasures.

Connor restores a 1967 Chevy II behind Mike's back; Mike installs an engine in a 1964 Ford F100 truck.

Partygoers receive rave reviews at the Coutts crossing; officers delve into an international affair.

Cookies can be more trouble than treat; twins with matching beers take a wrong turn.

A gruff general visits his severely injured son and faces the harsh realities of military life when the young man dies.

An old and dear friend of Col. Potter's arrives with injuries sustained in a careless accident.

Sam negotiates and Rountree goes under cover, when a man takes a busload of hostages and threatens to blow it up unless his daughter's war crimes are posthumously cleared.

Hondo and the team join forces with the FBI on a manhunt to find a militia group planning a domestic terror attack; Jessica's new police initiatives move forward; she braces herself for the negative impact those initiatives could have.

A German American pilot, Dieter Dengler, uses survival skills honed as a child to escape a secret prison in Laos during the early years of the Vietnam war.

When the infant son of an aviation legend is snatched from his crib at home, it ignites a media firestorm; after a nationwide manhunt, the supposed culprit is brought to justice, but questions pop up on the investigation.

A gruff general visits his severely injured son and faces the harsh realities of military life when the young man dies.

An old and dear friend of Col. Potter's arrives with injuries sustained in a careless accident.

Hondo and the team join forces with the FBI on a manhunt to find a militia group planning a domestic terror attack; Jessica's new police initiatives move forward; she braces herself for the negative impact those initiatives could have.

Pablo Escobar's Medellin Cartel become powerful cocaine traffickers; when they go to war with Colombia, the cartel tests their limits.

Oakland Hells Angels president, Sonny Barger, transforms the club into an organized crime syndicate and creates a blueprint for outlaw biker clubs to follow; federal authorities strike at the club, employing the RICO statute.

Multiple 911 calls push Dawson City to the brink as they battle to save a family home and a historic building, while snowstorms pummel Whitehorse, causing chaos and forcing a dangerous backcountry helicopter rescue mission.

Marty searches for a bull moose that vanished in thick brush; Mike races bears to pack out bull elk meat.; Lauro and Neil take their raft on its maiden voyage to set nets for fish and traps for beaver.

As winter tightens its icy grip, the small, isolated community of West Dawson finds itself completely cut off from emergency services. Alone, Ray faces a string of dangerous solo vehicle retrieval missions on a storm-battered highway.

A German American pilot, Dieter Dengler, uses survival skills honed as a child to escape a secret prison in Laos during the early years of the Vietnam war.

Marty searches for a bull moose that vanished in thick brush; Mike races bears to pack out bull elk meat.; Lauro and Neil take their raft on its maiden voyage to set nets for fish and traps for beaver.

As winter tightens its icy grip, the small, isolated community of West Dawson finds itself completely cut off from emergency services. Alone, Ray faces a string of dangerous solo vehicle retrieval missions on a storm-battered highway.

When the infant son of an aviation legend is snatched from his crib at home, it ignites a media firestorm; after a nationwide manhunt, the supposed culprit is brought to justice, but questions pop up on the investigation.

Marty searches for a bull moose that vanished in thick brush; Mike races bears to pack out bull elk meat.; Lauro and Neil take their raft on its maiden voyage to set nets for fish and traps for beaver.

Hondo and the team join forces with the FBI on a manhunt to find a militia group planning a domestic terror attack; Jessica's new police initiatives move forward; she braces herself for the negative impact those initiatives could have.

Sam negotiates and Rountree goes under cover, when a man takes a busload of hostages and threatens to blow it up unless his daughter's war crimes are posthumously cleared.

Ted and his team salvage an old farmhouse built by settlers who fled the American Revolution; Brandon puts his butt on the line to save some valuable lightning rods.

Mike risks ruin when he resurrects his costly restoration of a 1968 Camaro; new shop manager Avery sends the budget soaring on a 1966 Super Bee and they discover that thieves may be stealing parts from the Field of Dreams.

Moe and his team host their roadshow at the edge of the American Civil War's most famed battlegrounds, where the ghosts of Union and Confederate soldiers are known to roam.

Ted and his team salvage an old farmhouse built by settlers who fled the American Revolution; Brandon puts his butt on the line to save some valuable lightning rods.

Mike risks ruin when he resurrects his costly restoration of a 1968 Camaro; new shop manager Avery sends the budget soaring on a 1966 Super Bee and they discover that thieves may be stealing parts from the Field of Dreams.

Officers make a stunning discovery; a tourist's papers hint at her true plans for coming to Canada.

A senior has some unfriendly gear in his RV; a Canadian returning from Panama tells all.

When Charles is handed the job of being the 4077's charity collection officer, he desperately tries to pass the buck.

Everyone steps forth with memorable contributions when Hot Lips insists that a time capsule be left by the 4077th crew.

NCIS investigates the apparent suicide of a Navy intelligence officer who leapt to his death after taking LSD; while Kensi is away, Deeks makes plans to redo the backyard without her input.

Hondo and Jessica's secret relationship comes to a crossroads when the president of the police commission discovers their affair; Hondo and the team assist with the federal investigation to bring in an undocumented fugitive.

A look at whether time travel has already occurred, on purpose or by accident, and scientists who believe it is theoretically possible.

Stories of god-like beings providing instruction to early humans, helping establish the first civilizations; exploring if mysterious figures who appear throughout history provide evidence that these otherworldly teachers have been here all along.

When Charles is handed the job of being the 4077's charity collection officer, he desperately tries to pass the buck.

Everyone steps forth with memorable contributions when Hot Lips insists that a time capsule be left by the 4077th crew.

Hondo and Jessica's secret relationship comes to a crossroads when the president of the police commission discovers their affair; Hondo and the team assist with the federal investigation to bring in an undocumented fugitive.

As winter tightens its icy grip, the small, isolated community of West Dawson finds itself completely cut off from emergency services. Alone, Ray faces a string of dangerous solo vehicle retrieval missions on a storm-battered highway.

A look at whether time travel has already occurred, on purpose or by accident, and scientists who believe it is theoretically possible.

Humans want to go into uncharted territories to make discoveries; as the next era of space exploration begins it must be analyzed what humans will find when reaching other planets, as well as the dangers faced when trying to conquer new frontiers.

Studying stories of revenge, such as the one about a man in Colorado that uses a killdozer to settle a zoning dispute or another about an emperor who pickles his wife's lover; exploring vengeance seekers who take things too far.

Brothers Rick and Marty Lagina are closer than ever to solving the mystery.

Humans want to go into uncharted territories to make discoveries; as the next era of space exploration begins it must be analyzed what humans will find when reaching other planets, as well as the dangers faced when trying to conquer new frontiers.

Studying stories of revenge, such as the one about a man in Colorado that uses a killdozer to settle a zoning dispute or another about an emperor who pickles his wife's lover; exploring vengeance seekers who take things too far.

A look at whether time travel has already occurred, on purpose or by accident, and scientists who believe it is theoretically possible.

Stories of god-like beings providing instruction to early humans, helping establish the first civilizations; exploring if mysterious figures who appear throughout history provide evidence that these otherworldly teachers have been here all along.

Hondo and Jessica's secret relationship comes to a crossroads when the president of the police commission discovers their affair; Hondo and the team assist with the federal investigation to bring in an undocumented fugitive.

NCIS investigates the apparent suicide of a Navy intelligence officer who leapt to his death after taking LSD; while Kensi is away, Deeks makes plans to redo the backyard without her input.

Multiple 911 calls push Dawson City to the brink as they battle to save a family home and a historic building, while snowstorms pummel Whitehorse, causing chaos and forcing a dangerous backcountry helicopter rescue mission.

According to a 1980s author and historian, the Spanish have a long and hidden history of gold exploration in Pitt Lake, and Slumach found their cache.

Dale and his sister retrieve a crashed ATV; Dave slings propane across a river.

Multiple 911 calls push Dawson City to the brink as they battle to save a family home and a historic building, while snowstorms pummel Whitehorse, causing chaos and forcing a dangerous backcountry helicopter rescue mission.

According to a 1980s author and historian, the Spanish have a long and hidden history of gold exploration in Pitt Lake, and Slumach found their cache.

Lunchtime is one of the most enjoyable meals of every kid's day, but before the 1960s it was just another meal; then, three very different food visionaries take matters into their own hands.

A database software engineer is inspired to create a bigger, family-friendly video store, Blockbuster; an opening appears for two software executives in California to take on the media giant with their online subscription service, Netflix.

When Rick reels in an antique glass fishing buoy made in Japan, he hopes the seller's price floats his boat; Chum checks out a rare dinosaur fossil; a customer brings in an original poster for the film "Where the Buffalo Roam.".

The owner of an automotive boneyard is in the mood to sell; a California collector's kingdom of junk is home to one of the rarest motorbikes in the world.

Lunchtime is one of the most enjoyable meals of every kid's day, but before the 1960s it was just another meal; then, three very different food visionaries take matters into their own hands.

Humans want to go into uncharted territories to make discoveries; as the next era of space exploration begins it must be analyzed what humans will find when reaching other planets, as well as the dangers faced when trying to conquer new frontiers.

Studying stories of revenge, such as the one about a man in Colorado that uses a killdozer to settle a zoning dispute or another about an emperor who pickles his wife's lover; exploring vengeance seekers who take things too far.

As winter tightens its icy grip, the small, isolated community of West Dawson finds itself completely cut off from emergency services. Alone, Ray faces a string of dangerous solo vehicle retrieval missions on a storm-battered highway.

Sam Hanna must go under cover as a fighter to catch the leader of a gang dealing drugs on the streets.

When the NCIS team receives a cryptic, urgent message, Fatima and Rountree must work together to solve the case; Kilbride plans to visit his son; Callen asks Sam to be his best man.

When Hicks insists SWAT participate in Patrol Day in an effort to engage more meaningfully with the community, Hondo and Deacon have their hands full mentoring the newest members of the team; a suspended Tan investigates a mystery close to home.

When classified information falls into the wrong hands, the team races to stop a dangerous plot targeting former members of the U.S. military; Luca is faced with a challenging choice when a family member suddenly falls ill.

The team works with the FBI to hunt one of its most-wanted fugitives; Hondo and Nichelle are faced with an unexpected development in her pregnancy.

When Hicks insists SWAT participate in Patrol Day in an effort to engage more meaningfully with the community, Hondo and Deacon have their hands full mentoring the newest members of the team; a suspended Tan investigates a mystery close to home.

When classified information falls into the wrong hands, the team races to stop a dangerous plot targeting former members of the U.S. military; Luca is faced with a challenging choice when a family member suddenly falls ill.

The team works with the FBI to hunt one of its most-wanted fugitives; Hondo and Nichelle are faced with an unexpected development in her pregnancy.

Sam Hanna must go under cover as a fighter to catch the leader of a gang dealing drugs on the streets.

When the NCIS team receives a cryptic, urgent message, Fatima and Rountree must work together to solve the case; Kilbride plans to visit his son; Callen asks Sam to be his best man.

Mike and Frank pick a giant castle, a backyard spaceship and even an underground saloon in their search for weird wild worlds.

Rookie Scott gets a taste of the action when Buffalo responds to an emergency in Alberta.

Joe performs stunt landings for a film crew; new employee Ryan tries to prove his worth in Hay River; a dental hygienist gets thrown into the hot seat.

Thunder and lightning threaten logger Kevin Wenstob's crew as they shift into high gear on his high mountain timber claim.

Logger Kevin Wenstob gets terrible news as his crew struggles to bring the last of their 200 truckloads of logs off the mountain before winter shuts them down.

As winter tightens its icy grip, the small, isolated community of West Dawson finds itself completely cut off from emergency services. Alone, Ray faces a string of dangerous solo vehicle retrieval missions on a storm-battered highway.

France shipped prisoners to Devil's Island located off French Guiana so they would vanish from the public eye; Alfred Dreyfus, is a military officer convicted of crimes he didn't commit.

In the heart of the Confederacy, Andersonville was the last place a Union soldier wanted to end up during the Civil War; only opened for 14 months, becoming the final resting place for over 12,000 men.

Sam Hanna must go under cover as a fighter to catch the leader of a gang dealing drugs on the streets.

When the NCIS team receives a cryptic, urgent message, Fatima and Rountree must work together to solve the case; Kilbride plans to visit his son; Callen asks Sam to be his best man.

When Hicks insists SWAT participate in Patrol Day in an effort to engage more meaningfully with the community, Hondo and Deacon have their hands full mentoring the newest members of the team; a suspended Tan investigates a mystery close to home.

When classified information falls into the wrong hands, the team races to stop a dangerous plot targeting former members of the U.S. military; Luca is faced with a challenging choice when a family member suddenly falls ill.

The team works with the FBI to hunt one of its most-wanted fugitives; Hondo and Nichelle are faced with an unexpected development in her pregnancy.

Two previous champions will face off in a grueling five-hour challenge, making a blade inspired by Hollywood for the chance to duke it out against one of the titans of the forge.

Sinaloa and its leader El Chapo aim to become the world's largest drug trafficking organization, but their success is threatened by the Tijuana Cartel, and U.S. and Mexican authorities.

When John Gotti, a capo from the Bronx, becomes fed up with the greed of his boss, Paul Castellano, he orchestrates a mob hit; rising to power as the new don of the Gambino family, Gotti's reign draws the scrutiny of the FBI.

France shipped prisoners to Devil's Island located off French Guiana so they would vanish from the public eye; Alfred Dreyfus, is a military officer convicted of crimes he didn't commit.

In the heart of the Confederacy, Andersonville was the last place a Union soldier wanted to end up during the Civil War; only opened for 14 months, becoming the final resting place for over 12,000 men.

Matty Blake has a revealing meeting with the team about the incredible events that keep occurring at the so-called Triangle on Skinwalker Ranch.

Dr. Travis Taylor reveals the most mind-bending phenomena that the team has discovered so far at the mysterious Triangle on Skinwalker Ranch.

After the team conducts a simultaneous drone swarm experiment in order to stimulate phenomena on Skinwalker Ranch, they encounter more than what they bargained for.

Two brothers from Michigan search for buried treasure on Oak Island off the coast of Nova Scotia.

Brothers Rick and Marty Lagina are closer than ever to solving the mystery.

After the team conducts a simultaneous drone swarm experiment in order to stimulate phenomena on Skinwalker Ranch, they encounter more than what they bargained for.

Two brothers from Michigan search for buried treasure on Oak Island off the coast of Nova Scotia.

Brothers Rick and Marty Lagina are closer than ever to solving the mystery.

Matty Blake has a revealing meeting with the team about the incredible events that keep occurring at the so-called Triangle on Skinwalker Ranch.

Dr. Travis Taylor reveals the most mind-bending phenomena that the team has discovered so far at the mysterious Triangle on Skinwalker Ranch.

France shipped prisoners to Devil's Island located off French Guiana so they would vanish from the public eye; Alfred Dreyfus, is a military officer convicted of crimes he didn't commit.

In the heart of the Confederacy, Andersonville was the last place a Union soldier wanted to end up during the Civil War; only opened for 14 months, becoming the final resting place for over 12,000 men.

Sinaloa and its leader El Chapo aim to become the world's largest drug trafficking organization, but their success is threatened by the Tijuana Cartel, and U.S. and Mexican authorities.

When John Gotti, a capo from the Bronx, becomes fed up with the greed of his boss, Paul Castellano, he orchestrates a mob hit; rising to power as the new don of the Gambino family, Gotti's reign draws the scrutiny of the FBI.

At the site of a famous old hotel, Ted has to deal with a mountain of salvage and a ghost.

Mike's restoration of a 1966 Pontiac Parisienne connects him with Rust Valley's most oddball residents, as does a major swap meet, while his son Connor pushes him to help out a friend recovering from tragedy.

The spooky lighthouses on the east coast of Canada are only the tip of the paranormal iceberg; Moe and his team visit a historic prison and investigate a haunted axe from a 19th-century murder in another.

At the site of a famous old hotel, Ted has to deal with a mountain of salvage and a ghost.

Mike's restoration of a 1966 Pontiac Parisienne connects him with Rust Valley's most oddball residents, as does a major swap meet, while his son Connor pushes him to help out a friend recovering from tragedy.

An American is busted trying to catch a different kind of trip; officers help a tipsy traveler.

A heavy automobile container hints at trouble; A student's stash of food brings him discomfort.

As the war ends, Hawkeye has a nervous breakdown; Charles is dismayed when Margaret helps him get a position in Boston; B.J. tries to leave early; Father Mulcahy has a hearing loss; Klinger proposes to Soon Lee.

On the Hanoi Hilton, an American POW prison of the Vietnam War located in the city of Hanoi, Vietnam; captives include John McCain, the group of airmen who invent a secret communication code, and Jerimiah Denton who sneaks messages home on live TV.

On November 22, 1963, President John F Kennedy is assassinated, shaking the nation to its core; while an initial suspect is captured, many believe there's more to the story; investigators and amateur sleuths alike have been searching for answers.

Five years after John F. Kennedy is killed by gunshot, his brother Robert meets the same fate; an assassin's bullet again changes the course of history, and the latest clues in the case are riddled with inconsistencies.

As the war ends, Hawkeye has a nervous breakdown; Charles is dismayed when Margaret helps him get a position in Boston; B.J. tries to leave early; Father Mulcahy has a hearing loss; Klinger proposes to Soon Lee.

On the Hanoi Hilton, an American POW prison of the Vietnam War located in the city of Hanoi, Vietnam; captives include John McCain, the group of airmen who invent a secret communication code, and Jerimiah Denton who sneaks messages home on live TV.

Two brothers from Michigan search for buried treasure on Oak Island off the coast of Nova Scotia.

Located in the heart of London on the River Thames, the Tower of London's reputation for torture and beheadings fuels nightmares; originally built as a fortress by William the Conqueror in 1078, it becomes a prison in 1101.

Within the first forty years of operation, the Soviet Gulag system imprisons at least 18 million people and kills more than one and a half million; three tales of the fight for survival.

The top champions step back into the Forged in Fire arena to face their toughest competition yet: one of the expert judges. Tasked with making the grueling Ginunting sword in just five hours, only one will be left standing to compete.

Five years after John F. Kennedy is killed by gunshot, his brother Robert meets the same fate; an assassin's bullet again changes the course of history, and the latest clues in the case are riddled with inconsistencies.

Located in the heart of London on the River Thames, the Tower of London's reputation for torture and beheadings fuels nightmares; originally built as a fortress by William the Conqueror in 1078, it becomes a prison in 1101.

Within the first forty years of operation, the Soviet Gulag system imprisons at least 18 million people and kills more than one and a half million; three tales of the fight for survival.

The top champions step back into the Forged in Fire arena to face their toughest competition yet: one of the expert judges. Tasked with making the grueling Ginunting sword in just five hours, only one will be left standing to compete.

On November 22, 1963, President John F Kennedy is assassinated, shaking the nation to its core; while an initial suspect is captured, many believe there's more to the story; investigators and amateur sleuths alike have been searching for answers.

Five years after John F. Kennedy is killed by gunshot, his brother Robert meets the same fate; an assassin's bullet again changes the course of history, and the latest clues in the case are riddled with inconsistencies.

On November 22, 1963, President John F Kennedy is assassinated, shaking the nation to its core; while an initial suspect is captured, many believe there's more to the story; investigators and amateur sleuths alike have been searching for answers.

At the site of a famous old hotel, Ted has to deal with a mountain of salvage and a ghost.

Ted and his buddy Adam take on a difficult demolition with a big potential upside, but the risks are huge.

Mike struggles to finish a problematic 1966 Pontiac Parisienne, while stumbling into direct competition with a Rust Valley neighbour; Avery crashes into his new role as shop manager.

Moe's enthusiasm for vintage cars leads the team to an automotive museum and a mysterious haunted car; they prepare in a "curiosity shop" full of spooky objects.

Ted and his buddy Adam take on a difficult demolition with a big potential upside, but the risks are huge.

Mike struggles to finish a problematic 1966 Pontiac Parisienne, while stumbling into direct competition with a Rust Valley neighbour; Avery crashes into his new role as shop manager.

A traveler returns with a surprise; Marine officers come upon an infested container.

A student is failing his customs exam; officers prevent an artifact from going down in history.

To raise money to send his Korean houseboy to medical school, Hawkeye raffles off a weekend in Tokyo with a nurse.

Hawkeye and Trapper attempt to retrieve a supply of hydrocortisone stolen by black marketeers. Guest starring Jack Soo and Robert Ito.

The NCIS team scrambles to find Kensi after she is attacked and kidnapped by a mysterious militia group while helping a group of migrants cross the border.

The team goes on the hunt for a serial killer who escaped justice two years prior by faking his death; Hondo worries that the team's former leader is spiraling into depression in the aftermath of being fired from the department.

During World War II, a naval engineer accidentally creates an iconic spiral toy that walks down stairs; an engineer tries to invent a synthetic rubber for the war effort and instead creates a strange putty.

A young machinist in England invents one of the world's most successful toys when he creates a toy car small enough to fit inside a matchbox for his daughter to take to school; Elliot Handler creates one of the biggest toy rivalries in history.

To raise money to send his Korean houseboy to medical school, Hawkeye raffles off a weekend in Tokyo with a nurse.

Hawkeye and Trapper attempt to retrieve a supply of hydrocortisone stolen by black marketeers. Guest starring Jack Soo and Robert Ito.

The team goes on the hunt for a serial killer who escaped justice two years prior by faking his death; Hondo worries that the team's former leader is spiraling into depression in the aftermath of being fired from the department.