Forrest ventures home to Zimbabwe in search of the mysterious Cape lion; he and the crew navigate the African bush determined to get DNA proof, facing threats of charging rhinos and huge prides of lions.

Deep in the jungles of Colombia, Forrest is on a mission to prove the Rio Apaporis Caiman still exists. Locals believe this crocodilian resides within a lawless land inhabited by guerilla rebels, kidnappers, and deadly predators.

Forrest is in the Galapagos seeking the Fernandina tortoise, an animal that was only seen once, over 100 years ago; the clues are here, along with an abundance of unique species, raising hopes of a historic discovery.

In Vietnam, Forrest teams up with a conservation group to save the largest turtle species in the world from extinction; using cutting edge technology, they attempt to find a suitor for the last and only surviving Giant Softshell.

Forrest ventures home to Zimbabwe in search of the mysterious Cape lion; he and the crew navigate the African bush determined to get DNA proof, facing threats of charging rhinos and huge prides of lions.

Deep in the jungles of Colombia, Forrest is on a mission to prove the Rio Apaporis Caiman still exists. Locals believe this crocodilian resides within a lawless land inhabited by guerilla rebels, kidnappers, and deadly predators.

Forrest is in the Galapagos seeking the Fernandina tortoise, an animal that was only seen once, over 100 years ago; the clues are here, along with an abundance of unique species, raising hopes of a historic discovery.

In Vietnam, Forrest teams up with a conservation group to save the largest turtle species in the world from extinction; using cutting edge technology, they attempt to find a suitor for the last and only surviving Giant Softshell.

A massive leak fills the Time Bandit; a fistfight tests Jake's resolve while heavy winds and a snapped anchor threaten to wreck his boat; Sig's greenhorn has an awkward question.

Wild Bill struggles to pilot his new boat in big seas; Johnathan faces off with a massive swell in the perilous False Pass.

Amanda works with Tia of Pit Bulls & Parolees to rescue a 3-legged Shepherd mix as part of a road trip rescue mission; she picks up 16 dogs along the way, including a young lab with a brain issue and a puppy mill survivor.

A member of Amanda's crew wants to adopt a Frenchie who lived her entire life in a puppy mill; Cupid, a lab mix puppy, needs daily physical therapy for a brain disorder; a pittie from Amanda's past needs emergency surgery.

Zoo staff make the journey to east Africa to return to the wild thousands of toads they helped rescue from extinction; Utu, the test-pilot giraffe, tries out a new piece of equipment; the bird department works to save the lives of millions of birds.

A 14-year-old otter is not its usual, energetic self; staff at the New York Aquarium move their sharks to a new exhibit; quirky capercaillies need help producing healthy chicks.

Dan and Chris head across Lake Michigan to adopt two Mangalica piglets; a rooster called Bart undergoes surgery to remove his spur, and Steve the goat is gifted with pool noodles to protect the other animals from his rage.

After a year in the making, the Barn Sanctuary pigs are ready to move into their pig palace; the turkeys are gifted with musical instruments, and after Andy the cow passes, the staff has a memorial in his honor.

While pregnant, Bindi continues to work at the Wildlife Hospital.

Tia races to save the life of a dog that's been shot; a scared and sick puppy running loose near heavy traffic is pursued by Matt and Lizzy; Tia faces an agonizing decision after a home inspection raises red-flags.

Matt gets so scared during a rescue that Tania has to take over; newbie discovers the heartbreak associated with a life in dog rescue; a team favorite finally gets her shot at a forever home.

Pete builds a Swiss Family Robinson inspired treehouse in Michigan to help a man surprise his wife for their anniversary; Inspired but far more advanced than the original.

Pete's son Charlie oversees the latest project, which happens to be a live-in Washington resort and spa, home base for himself on 23 acres of forest.

Pete's fun-loving friend is the lucky recipient of a treehouse built strictly for good times; the team builds a dream of a treehouse complete with a wine bar, a loft, and their first-ever hot tub in the woods of Western Washington.

Pete tackles the first climb-in movie theater; concessions are served to seating pods through a pulley system and loungers elevate into the trees to give perfect views of the big screen; a tree house for monkeys at the Los Angeles Zoo.

The NTS crew travels to an alpaca farm to build a lodge in the trees inspired by national parks; they create a structure to take in the mountain views with a 50-foot-long cable bridge entrance and a deck devoted entirely to hammock lounging.

Pete answers the call of duty to build a tree house in Pennsylvania that focuses on the children of Marines; cargo netting off the deck provides an exciting way to enter, while even more nets inside form a bridge to access a private loft space.

A couple wants a treehouse inspired by a children's book with a grown-up twist, and at the same time, Pete and the team build a whimsical Tudor-style theatre treehouse.

The NTS team leave their tents behind and head to New Jersey to build a campers' retreat for an outdoor-loving couple; with a screened-in porch, floating barbecue deck and cozy hanging bed, this Adirondack style tree-cabin puts glamping in the trees.

Pete answers the call of duty to build a tree house in Pennsylvania that focuses on the children of Marines; cargo netting off the deck provides an exciting way to enter, while even more nets inside form a bridge to access a private loft space.

A couple wants a treehouse inspired by a children's book with a grown-up twist, and at the same time, Pete and the team build a whimsical Tudor-style theatre treehouse.

The NTS team leave their tents behind and head to New Jersey to build a campers' retreat for an outdoor-loving couple; with a screened-in porch, floating barbecue deck and cozy hanging bed, this Adirondack style tree-cabin puts glamping in the trees.

Pete's son Charlie oversees the latest project, which happens to be a live-in Washington resort and spa, home base for himself on 23 acres of forest.

Pete's fun-loving friend is the lucky recipient of a treehouse built strictly for good times; the team builds a dream of a treehouse complete with a wine bar, a loft, and their first-ever hot tub in the woods of Western Washington.

A woman and her family spend their time rescuing and rehabilitating koalas in their home in Australia; Crikey the koala, a baby found alone and very sick, becomes well enough to release back into the wild.

Katherine Conner drops out of school at 16 to work as a professional dancer in London's West End, her life's dream; at the age of 21, while on vacation in Thailand, she meets a baby elephant named Boon Lott that changes her life forever.

A nuisance call leads to a dangerous encounter with two bloodthirsty lizards; Tre and Jimmy bring alligators to a saloon.

Paul and Jimmy argue over Jimmy's goal to expand the Gator Boys Rescue Operation; Jimmy disappears; Paul tries to keep the Gator Boys from falling apart.

Paul and Jimmy capture a monster-sized gator; an alligator fights to protect her young.

Ashley has a bad experience in the gator pit; Jimmy accuses Chris of poor training methods.

Paul and Scott must fend for themselves when Jimmy makes an adventurous trip to South Carolina.

Troublesome alligators must be removed from a school playground, a nursery and a housing development; a Burmese python sinks its fangs into Tre.

Paul hopes to capture a gator before it gets hooked by an uncaring trapper; Tre books a risque photo shoot with gators and swimsuit models.

The boys have three minutes to obtain blood samples from aggressive gators for an important research project.

A 12-foot alligator stalks farm animals; an elusive gator moves into a neighborhood pond; a triple-amputee war veteran wants to wrestle an alligator.

A water moccasin is spotted near a home; 6-foot-long rattlesnake; Paul and Scott pull a prank on Ashley and Chris.

Skylar the cat is deathly afraid of her own tail; Jackson meets pair of guardians whose cat is destroying the house and attacking people at random.

A family becomes divided about a cat they rescued from New Orleans after Hurricane Katrina that is spraying the house and preventing them from getting new furniture.

Soft-spoken musician is ashamed that she can't control her abusive cat; Debbie's apartment is overrun by her pair of hairless Donskoy cats.

Samantha is so afraid of her cat, Spike, that she keeps him in a cat box outside the house; cats in Brooklyn are making life difficult for a couple who watch them fight constantly.

Father and son in New York, N.Y. have been caring for a feral cat colony in their backyard, but now are in serious need of some help; Jackson tries to help Mike and Darcy's antisocial cat.

A foster family has serious difficulty with a cat they want to adopt and asks Jackson for help; Jackson meets the feline Internet sensation Lil' Bunny Sue Roux, who has no front legs.

Soft-spoken musician is ashamed that she can't control her abusive cat; Debbie's apartment is overrun by her pair of hairless Donskoy cats.

Samantha is so afraid of her cat, Spike, that she keeps him in a cat box outside the house; cats in Brooklyn are making life difficult for a couple who watch them fight constantly.

Father and son in New York, N.Y. have been caring for a feral cat colony in their backyard, but now are in serious need of some help; Jackson tries to help Mike and Darcy's antisocial cat.

A foster family has serious difficulty with a cat they want to adopt and asks Jackson for help; Jackson meets the feline Internet sensation Lil' Bunny Sue Roux, who has no front legs.

A 12-foot alligator stalks farm animals; an elusive gator moves into a neighborhood pond; a triple-amputee war veteran wants to wrestle an alligator.

A water moccasin is spotted near a home; 6-foot-long rattlesnake; Paul and Scott pull a prank on Ashley and Chris.

A swan with a fish hook caught in its mouth requires a light touch from the RSPCA. Meanwhile, a group of ducklings are found covered in oil by some railway tracks and need immediate assistance.

A raven reared as a pet must forget its tame behavior if it is to return to the wild and be able to survive; Paige Burnham struggles to rescue a deer trapped by the quickly rising tide.

Famous for its Mayan ruins, the Yucatán in Mexico is home to diverse wildlife; after years of overharvesting and exploitation, regulated hunting is helping to conserve large areas of the fragile ecosystem; Dan travels to the region to learn more.

Human-wildlife conflict is common in Borneo, where human populations are scattered throughout the landscape; Dan Cabela travels to the area to participate in an elephant collaring project showing how people and elephants can live harmoniously.

The search is on for a missing boater who may have suffered a stroke on Corney Lake; wildlife agents deploy as a hurricane makes landfall, rescuing stranded survivors from the floodwaters and dispensing lifesaving supplies.

Wildlife agents join a manhunt for an armed fugitive on the bayou; a nervous young hunter reveals a serious violation; a night shrimping bust leads to a familiar and unrepentant culprit.

When wildlife agents find an alligator with a fresh bullet wound to the head, nearby anglers are the prime suspects; an injured hunter must be evacuated by helicopter; agents use drones to track crabbers selling their catch across state lines.

Wildlife agents question a hunter with something to hide and notice damning evidence on his person; a group of youths shooting ducks from a moving boat is caught in the act; frightened hunters accuse a landowner of serial harassment.

Wildlife agents interrogate a felon caught hunting with a firearm; witnesses report a hunter trying to bludgeon a swimming deer from his boat; a duck shot out of season leads agents to a slew of violations.

When an elderly man goes missing in a vast wilderness area, wildlife agents race to find him before nightfall; a tip leads agents to a haul of undersized redfish and anglers who refuse to confess; bloody evidence ties a trespasser to an illegal deer.

Officer Crouse responds to a call about a nuisance raccoon; Officer Towne searches for a deer attacked by coyotes; Officer Hannett monitors a suspicious fisherman; Officer St. Pierre responds to a call about an impaired driver.

Nature lovers show up for Discover Wild New Hampshire Day; Officers conduct an undercover surveillance; Officer McKee rescues a starving owl from the side of the road; on Mount Monadnock, a perilous rescue of an injured hiker.

Lt. Boudreau teams up with Trainee Masucci to track down a turkey hunter who may have shot from the road; when an animal release goes south, Officer Hannett lends a hand;Officer Canfield races to catch a trespassing dirt biker.

A team is deployed to relocate a moose that has found its way into the city; during an undercover mission, Officer Egan encounters multiple violating bird hunters; Officer Canfield rushes to rescue an injured hiker trapped on Mount Carrigain.

A group of ATV riders on prohibited trails; an illegal deer kill; an abandoned car is found on the Androscoggin River.

A look at the lives of Montana conservation officers who defend public lands, handle anti-poaching sting operations and more.

Wardens discover a sunken jet boat and its unhappy captain; out-of-state campers get a surprise visit from a warden; wardens take matters into their own hands when they find a shed filled with elk antlers.

A look at the lives of Montana conservation officers who defend public lands, handle anti-poaching sting operations and more.

Wardens discover a sunken jet boat and its unhappy captain; out-of-state campers get a surprise visit from a warden; wardens take matters into their own hands when they find a shed filled with elk antlers.

Nature lovers show up for Discover Wild New Hampshire Day; Officers conduct an undercover surveillance; Officer McKee rescues a starving owl from the side of the road; on Mount Monadnock, a perilous rescue of an injured hiker.

Lt. Boudreau teams up with Trainee Masucci to track down a turkey hunter who may have shot from the road; when an animal release goes south, Officer Hannett lends a hand;Officer Canfield races to catch a trespassing dirt biker.

In the Pacific Northwest, Jared Douglas and his logging crew risk life and limb to harvest some of the planet's most remote and valuable trees; getting these giants from the forest to market is deadly.

To make up for lost profits, Jared takes a big gamble on bringing two valuable pieces of machinery back to life after decades of neglect; handfallers Jim and Rob go toe-to-toe with a giant cedar that threatens to shut down the entire operation.

Jared moves into an abandoned logging camp, placing a $600,000 bet on a remote, dangerous site that will either sink or save his business; Ross is charged with moving the float camp ten miles deeper into the wilderness.

Drowning in debt, Jared is doing everything he can to keep his business afloat and his workers employed; when foul play threatens to sink his float camp, Jared fights back as his fallers play a game of dominos to get high-dollar trees to market.

Jared needs to move $1 million of wood down a river to market but can't find anyone brave enough to lead the journey; moving deeper into the wilderness to chase big wood, the road builders prepare a blast to gain access.

In an all-out push to turn a profit at Grizzly Camp, Jared enlists Dave to navigate $200,000 of wood down the deadly Grizzly River; fallers Chris and Jeff tackle steep terrain in search of big wood.

As fire season draws closer and threatens widespread shutdowns, Jared's feeling the heat; he races to salvage logs before it's too late; at Grizzly River, fallers Jim and Rob are called in to help clear a path to one last stand of money trees.

With fire season looming, Jared is under the gun to get all his product out of the woods before it turns to ash; fallers race to drop trees without sparking a backcountry blaze; an alarming discovery at float camp could sink the whole operation.

With just days left to move timber before fire season shuts him down, Jared races to save his float camp from sinking; Dave struggles to send one last haul down Grizzly River; Ross is called to the scene of an accident.

The Jackson family in Idaho suffers from a cabin on the verge of collapse and predator threat from 100 chickens; the Raneys use all new ingenuity to make the cabin livable, protect the flock and create a valuable income source.

In a first ever Homestead intervention, a daughter pleads for help from the Raneys to rescue her mother and step-father whose failing homestead in Arizona sits in the crosshairs of deadly monsoon floods and a menacing cougar.

In the Smoky Mountains, the Raneys visit a wind-ravaged homestead on the brink of total collapse; the Raneys race to shore up key structures and establish a viable homestead business before the next big storm.

A single mother's homestead is trapped between two active volcanoes; to battle the threat of toxic rain, the Raneys reinforce their besieged property, adding a safe water source and fortified gardens.

Marty Raney returns to the Nash homestead on Kauai; he builds a sheep barn and works on beekeeping; an unexpected person helps with the garden.

A widowed homesteader, realizing she didn't learn the skills she needed before her husband's passing, is overwhelmed by her large family homestead; her six kids are now even more determined to protect their dad's off-grid legacy and over 100 animals.

Marty Raney returns to the Nash homestead on Kauai; he builds a sheep barn and works on beekeeping; an unexpected person helps with the garden.

A widowed homesteader, realizing she didn't learn the skills she needed before her husband's passing, is overwhelmed by her large family homestead; her six kids are now even more determined to protect their dad's off-grid legacy and over 100 animals.

In a first ever Homestead intervention, a daughter pleads for help from the Raneys to rescue her mother and step-father whose failing homestead in Arizona sits in the crosshairs of deadly monsoon floods and a menacing cougar.

In the Smoky Mountains, the Raneys visit a wind-ravaged homestead on the brink of total collapse; the Raneys race to shore up key structures and establish a viable homestead business before the next big storm.

Six Coton de Tulear puppies romp on a farm; a young German shepherd struggles with obedience classes; twin French bulldog pups get in a tussle.

A shy toyger kitten makes friends with a large housemate; British shorthairs audition to work the door at a veterinarian's office; a RagaMuffin avoids household chores.

Andean bear Bouba returns from the National Zoo in Washington, D.C., to reunite with his mate, Nicole; a king cobra is treated; Blanche, a feisty alpaca, is due to give birth at any moment.

A markhor goat gives birth to Andre, the biggest baby of the year; a baby bat requires human care before it can be reintroduced to its colony; confiscated lizards destined for the pet trade require urgent medical attention.

Antonio helps a family who opened their home to neighborhood dogs create the ultimate backyard dog park with custom dog houses, a paddling pool for hot summer days, and a slick structure of ramps and tunnels to keep everyone entertained and active.

Antonio and his team design and build an elaborate system of tunnels and towers spanning two rooms for a family and their seven chinchillas.

After months of croc wrangling training with Steve Irwin's best friend Wes, Robert, Steve's son, takes the final step in his journey to feed Graham, a huge crocodile at the zoo's famous Crocoseum.

Tia, Tania and new employee Perry orchestrate a midnight rescue of an injured dog; unexpected danger threatens a potential home.

Ten dogs are rescued from inhumane conditions; Tia finds companion for special needs teen.

Investigator Marlynn Barkley tries to save a dog that has been left for dead by its owners.

A cat is brought into the shelter with its paws missing.

A dog with matted fur and an embedded harness is brought to the shelter.

Texas Game Warden Gould responds to the call about an exotic red stag that was shot; in Hunt County, many warrants are dispersed for unpaid fishing violations; Warden Flores and Warden Williams join forces on the last day on patrol.

As Warden Richards reminisces on his career during the last day on the job, he races to rescue a cow being attacked by a pack of hunting dogs; at the academy, new recruits wrangle a gator, while anglers are caught illegally fishing.

Discover the lives of conservation officers of Montana defending public lands, handling anti-poaching sting operations, and more.

Discover the lives of conservation officers of Montana defending public lands, handling anti-poaching sting operations, and more.

Discover the lives of conservation officers of Montana defending public lands, handling anti-poaching sting operations, and more.

Discover the lives of conservation officers of Montana defending public lands, handling anti-poaching sting operations, and more.

A cat is brought into the shelter with its paws missing.

A dog with matted fur and an embedded harness is brought to the shelter.

Oreo the tiny tuxedo kitten meets a smelly look-alike; Russian Blue siblings go on an adventure; Freckles the Ocicat tries to control five little jungle cats.

A pit bull puppy learns to walk; Chinese crested puppies investigate a turtle; a newborn collie overcomes her shyness.

Keepers introduce three gaur, a large species of cattle, to the rest of the herd; a sickly sambar fawn is rushed to the health center; the bird department prepares for the arrival of great hornbills.

Peaches, a 2-month-old warthog, charms his keepers while training to become an animal ambassador; a nervous one-horned rhino adjusts to her new exhibit; Willow, a red panda, shows signs of being pregnant.

A couple wants their savannah cat and foster kittens to safely enjoy the outdoors; Antonio's solution is to build an intricate system of outdoor catwalks and double-decker enclosures with cat-friendly plants, natural climbing surfaces and toys.

Antonio transforms an overgrown backyard into a beach-themed oasis for humans and rescued rabbits, complete with predator-proof enclosures.

Hunter the Sumatran tiger is blind and must be sedated for his annual eye check; the keepers prepare young giraffe Scarlett for a road trip to South Australia, reuniting her with family.

Tia is lured into a potentially deadly rescue when two pit bulls hide behind a stack of lumber.

A rescue mission focuses on a protective mama and her litter; William must step up and control rowdy puppies.

Wayde and Brett create unique aquariums for a luxury apartment complex and a knee brace company; Wayde hopes to energize his employees by holding a special contest.

Wayde and Brett are challenged by a Southern California resort to build a tank inside the trunk of an oak tree; a Halloween store wants a coffin aquarium.

Never before scene footage of some of the most outrageous tanks ever made.

Client wants a playable 8-piece drum set tank; tank for Hawaiian Lahaina Grill.

Wayde sends the team to team building boot camp to keep them motivated in building two huge salt water tanks.

Mike learns how to make high quality bird food in Payette, Idaho, and then milks spiders for their venom in Arizona.

Mike visits the Happy Trails Kennels in Big Lake, Alaska, where he finds out how to breed and train sled dogs.

Mike heads to a unique dairy farm in Ramona, Calif. where he learns how to milk, care for and breed dromedary camels.

Mike performs tests on endangered snapping turtles, then travels to San Francisco where he removes and recycles toilets.

Mike learns how to make high quality bird food in Payette, Idaho, and then milks spiders for their venom in Arizona.

Mike visits the Happy Trails Kennels in Big Lake, Alaska, where he finds out how to breed and train sled dogs.

Mike heads to a unique dairy farm in Ramona, Calif. where he learns how to milk, care for and breed dromedary camels.

Mike performs tests on endangered snapping turtles, then travels to San Francisco where he removes and recycles toilets.

Wayde and Brett are challenged by a Southern California resort to build a tank inside the trunk of an oak tree; a Halloween store wants a coffin aquarium.

Never before scene footage of some of the most outrageous tanks ever made.

A peppy aunt coaxes a Cavalier King Charles spaniel out of her shell; Alaskan malamutes compete to be top dog; three fire-station Dalmatians display their skills.

Nanook, a shy Chinook, is the only boy in a litter of four and is training to be a sled dog; Rocky the Labradoodle and his brother Stanley grow up poolside.

A trio of new penguin chicks are introduced to the pool for their first swim; family dynamics change when the mandrill monkey troop welcomes a new baby; a pair of king vultures are prepped for their big debut at the Queens Zoo.

A new bison calf has a hard time keeping up with his mom; the bird department prepares a group of Von der Decken hornbill chicks for their move to the Minnesota Zoo; keepers at the Central Park Zoo hope the female snow monkeys accept a new male.

Antonio goes hog wild and designs the ultimate piggy paradise with a new pig house, a mud pit, space to run and an activity wall to keep Mr. Pickles happy.

Antonio builds the ultimate barn with all the modern comforts for two rescued miniature horses that insist on sleeping in their owner's bedroom.

The family prepares Croc One, Steve Irwin's research ship, for a mission to release an endangered sea turtle back to the wild; Scarlett the giraffe reunites with her grandmother; Grub the wild echidna is released from the Zoo's Wildlife Hospital.

The Villalobos crew races into the city in search of a dog reportedly hit by a car; with the new arrival needing a kennel, Tia hopes adopting out a dog to a police officer and his sister will relieve capacity.

Tia receives a call about a puppy stuck in a pipe at the edge of the river and enlists the help of the twins and the parolees to rescue the dog; Tania and Perry must help build up a shy puppy's confidence when an adopter comes calling.

An Arctic mega-storm rocks the fleet; Sig plays cat-and-mouse with towering waves; Keith watches an 800-pound crab pot launch into a deckhand; Wild Bill fights for a comeback.

Sig, Johnathan and Jake attempt to run from a second arctic hurricane, but Keith refuses to heed the warnings; Stress-induced chest pains threaten the remainder of Sig's season.

After suffering chest pains, Sig awaits news in the hospital; Wild Bill struggles to stay out of harm's way while also handling dissension on deck; Sean lays down the law with Zack.

In the wake of the Destination tragedy, one last storm bears down on Edgar, Bill, Sean and Jake; the Coast Guard attempts to save the crew of a fishing vessel while their boat takes on water.

Shedding blood on the Time Bandit; a fight breaks out on the Wizard; the Northwestern grapples with a burnt-out boat; a lost bet leads to cod guts on the Brenna A.

Lucas Congdon and his crew are tasked with creating a jungle feel in a suburban backyard.

Lucas creates an outdoor water room in which a mermaid could live; former clients that love the ocean want to remodel their tiny pool that sits yards away from the Gulf of Mexico.

Lucas builds a family size water park in a neglected backyard that includes a waterslide and double decker outdoor patio.

Lucas and his crew encounter several design firsts as they create a Mexican-inspired resort in a Venice, Fla. backyard.

Lucas Congdon and his crew are tasked with creating a jungle feel in a suburban backyard.

Lucas creates an outdoor water room in which a mermaid could live; former clients that love the ocean want to remodel their tiny pool that sits yards away from the Gulf of Mexico.

Lucas builds a family size water park in a neglected backyard that includes a waterslide and double decker outdoor patio.

Lucas and his crew encounter several design firsts as they create a Mexican-inspired resort in a Venice, Fla. backyard.

Sig, Johnathan and Jake attempt to run from a second arctic hurricane, but Keith refuses to heed the warnings; Stress-induced chest pains threaten the remainder of Sig's season.

After suffering chest pains, Sig awaits news in the hospital; Wild Bill struggles to stay out of harm's way while also handling dissension on deck; Sean lays down the law with Zack.

A Shar-Pei keeps his toys away from his siblings; a young cairn terrier sets off on an adventure; a tiny boxer's grandfather steers him toward glory.

Nine keeshond puppies try to befriend a flock of ducks; a young Great Dane tries to adjust to his growing body; five cocker spaniel siblings exhibit different personalities.

Crate training Nikita the Amur tiger in preparation for her move to Washington, D.C., proves challenging; an endangered Chinese alligator shows signs of being pregnant; staff prepare to release rare New England cottontail rabbits into the wild.

A giraffe named Mashengo journeys from the Indiana Zoo to his new home in the Bronx; keepers hand-raise endangered ducklings and release them at the Central Park Children's Zoo; love is in the air for a pair of cloud rats.

Antonio transforms two Nigerian dwarf goats' space into the ultimate goat playground, complete with a climbing tower, observation deck, and an easy-to-clean three-story house.

Ricky adopted a 20-foot Burmese python he rescued from a burning building, and now needs Antonio's help to transform his basement into an epic habitat with heated rock facades, a waterfall and a pond.

Robert wrangles Utah, a venomous 12-foot king cobra; Dr. Amber visits Tandora to care for wild koalas; back at the zoo, an old injury flares up for Bruce the brolga, a bird that has been in the Irwins' care for 26 years.

As the team drives all the way to Michigan for a home check, they get sidetracked by an emergency rescue.

Two dogs running wild on the train tracks prompts a dangerous rescue mission; married couple look to adopt a dog to help heal from tragedy.

Pete helps three siblings surprise their parents with a Scandinavian-style, two story, art studio treehouse with Murphy-bed art tables, multi-use studio area and sky tents in Wisconsin.

Pete is tasked with building a tree-top, Native American themed, summer camp treehouse with a built-in kennel, French door, climbing wall, back deck and fire pole for a young family on the Washington coast.

Pete and the crew look to Buddha's teachings as they build a traditional Japanese teahouse 20 feet in the air complete with a shoji screen wall, Tatami mats, low table with sunken floor and pagoda style roof for a zen-like paradise in Seattle.

Inspired by South American treehouse maestro Richard Brunnelli, Pete builds a hexagonal live-in treehouse for a Treehouse Workshop graduate in coastal Oregon.

A heard of goats stand in the way of Pete building an elegant English retreat with a luxurious hanging bed on an idyllic farm in Waxhaw, N.C.

Pete and the crew round-up the magnificent seven of cypresses alongside the Frio River and moseys on down to Leakey, Texas to build a gigantic, Texas-sized treehouse with the longest bridge in NT&S history.

Pete builds a secluded, three-story, speakeasy-themed treehouse, 60 feet above the ground with rooftop lounge and writing-and-recording room with vintage guitars for country music superstar Brian Kelley, of the award-winning duo Florida Georgia Line.

Pete returns to where he built his very first treehouse; now with experience, knowledge, new techniques and some steel, he can rebuild it; he has the technology; he has the capability to build the world's first bionic treehouse.

Amish locals help Pete construct a barn-themed treehouse tavern on an Ohio family's sprawling rural property.

Pete and the crew round-up the magnificent seven of cypresses alongside the Frio River and moseys on down to Leakey, Texas to build a gigantic, Texas-sized treehouse with the longest bridge in NT&S history.

Pete builds a secluded, three-story, speakeasy-themed treehouse, 60 feet above the ground with rooftop lounge and writing-and-recording room with vintage guitars for country music superstar Brian Kelley, of the award-winning duo Florida Georgia Line.

Pete returns to where he built his very first treehouse; now with experience, knowledge, new techniques and some steel, he can rebuild it; he has the technology; he has the capability to build the world's first bionic treehouse.

Amish locals help Pete construct a barn-themed treehouse tavern on an Ohio family's sprawling rural property.

Pete is tasked with building a tree-top, Native American themed, summer camp treehouse with a built-in kennel, French door, climbing wall, back deck and fire pole for a young family on the Washington coast.

Pete and the crew look to Buddha's teachings as they build a traditional Japanese teahouse 20 feet in the air complete with a shoji screen wall, Tatami mats, low table with sunken floor and pagoda style roof for a zen-like paradise in Seattle.

Theresa and Tony Scruff Matthews turned their dream retirement home in Australia into a full-time kangaroo rescue; they're ready to release kangaroos Lisa, Luna, and Barbie, but an injury might threaten one of them returning to the wild.

Seven-year-old social media sensation Roman McConn and his mom, Jen, have saved over 1,500 shelter dogs by connecting them with adopters around the country; the duo have 1 month to find homes for over 100 shelter dogs, including Noah, Rocky and Migo.

A quarrelsome cat threatens marriage plans; an aggressive feline interferes with a Pilates business.

A Bengal cat disrupts the peace between girlfriends; Mad Max sneaks into a neighbor's apartment.

A vicious feline's attacks threaten to keep a couple from getting married; a tiny dog is terrorized by an aggressive cat.

A nasty feline prevents a couple from adding a baby to their family; a couple's cat chases them around the house.

Two feuding felines threaten a couple's impending honeymoon; a Bengal cat refuses to engage in play duty.

A once-cuddly kitten matures into a demonic feline; a couple's rescue cat resents the arrival of a new kitten.

A woman and her friend share custody of a yowling, troublesome feline; a couple want to start a family, but are worried about their cat's aggressive behavior.

A man puts his annoying cat in.

A transplanted cat attacks its owners; a man moves in with his girlfriend, but her cat resents the new man of the house.

A couple's ferocious feline keeps family members from visiting; a Russian blue cat declares war on her owner's boyfriend.

Roommates Josh and Grace's respective cats are constantly attacking each other; feral cat, Blackie, is a handful for mother-daughter duo, Catherine and Patty; Koneko Cat Café.

Jackson enters the Santé D'or shelter with the intention of helping an over-aggressive shelter cat, Pig Pen.

Scout fears his tormentor, Caramel, to the point that he literally lives inside a kitchen cabinet; a woman adopts a hybrid Bengal cat who can use the toilet but can't otherwise keep still.

Jackson works with a guardian, Tara, whose traumatic experience with her previous cat affects her currently troubled cat, Cali; Jackson must deal with guardian Kurtis and his cat, Kurtis Jr., before the guardian has his feline namesake declawed.

Jackson works with a couple who have a lovable cat, Zachary, that also happens to spray all over the house; Jackson's conclusion as to why Zachary marks: barbarians at the gate; Jackson meets with troublemaking cat Freddie Krueger.

Jackson helps a couple whose three cats fight so much they moved into a bigger house just to give them extra space apart; the Cat Daddy works with a feral shop cat named Greenie whose spraying threatens business.

Scout fears his tormentor, Caramel, to the point that he literally lives inside a kitchen cabinet; a woman adopts a hybrid Bengal cat who can use the toilet but can't otherwise keep still.

Jackson works with a guardian, Tara, whose traumatic experience with her previous cat affects her currently troubled cat, Cali; Jackson must deal with guardian Kurtis and his cat, Kurtis Jr., before the guardian has his feline namesake declawed.

Jackson works with a couple who have a lovable cat, Zachary, that also happens to spray all over the house; Jackson's conclusion as to why Zachary marks: barbarians at the gate; Jackson meets with troublemaking cat Freddie Krueger.

Jackson helps a couple whose three cats fight so much they moved into a bigger house just to give them extra space apart; the Cat Daddy works with a feral shop cat named Greenie whose spraying threatens business.

A transplanted cat attacks its owners; a man moves in with his girlfriend, but her cat resents the new man of the house.

A couple's ferocious feline keeps family members from visiting; a Russian blue cat declares war on her owner's boyfriend.