When Nigel and Marianne Thornberry get word that the only way to save the funding for their show is to do one on the dangerous black rhino, Eliza and Darwin go in search of one. Find one they do, but when Donnie bites its tail and causes it to charge, can Nigel save them in time?
Eliza busts a young elephant out of a Kenyan game preserve, only to face predators and poachers who are out to get them.
Eliza and Debbie's combined bungling sends the commvee careening down a mountain, where it lies mired in the mud. They come face to face with a menacing-looking, but quirky tribe of silverback gorillas, and they must work together to ""unstick"" the van.
When the Thornberrys are forced to spend the night in the middle of the savanna, Eliza seizes the opportunity to go hunting with a pride of lions--only to discover that Debbie is about to become a midnight snack!
When Eliza, Darwin and Donnie are flung from a Matadi-bound barge and stranded on the banks of the Congo river, they must traverse the cliffs and crags of mountainous Zaire in order to catch up with her family.
When Eliza discovers a secret temple, a group of jaguars believe that she is their long lost queen. Thrilled with her new royal position, Eliza gets in over her head and must escape the avenging jaguars.
As animals flee their homes and run for their lives, Eliza discovers that Kip and Biederman are destroying part of the rainforest. In an all-out war against the evil duo, Eliza must convince the animals that with everybody's help, they can stop the destruction and save the forest.
Eliza's imagination gets the best of her when she thinks a local teenage girl is actually a dolphin who's trying to abduct her sister, Debbie, into a watery world.
A swarm of mysterious prankster marmosets overrun the Thornberrry camp, and it's up to Eliza to beat them at their own game.
Annoyed with Eliza, Darwin sets off into the jungle to prove he still has his natural instincts. After a scary night in the jungle, he stumbles upon an empty shack and hides out. When the family who lives in the shack returns to find Darwin in their home, they couldn't be more pleased with their new guest. It's up to Eliza to save the oblivious Darwin from becoming the next family dinner!
Challenging an ancient Maasai legend, Eliza marches into a ""haunted"" forest to prove her bravery. Now, with night falling, Eliza must place her trust in the mysterious legends of the Maasai in order to find her way safely through the dark forest.
Eliza's good-natured intentions of assisting a struggling bird in getting food set off a chain reaction of destruction within the ecological system. It's up to her to retrace her steps and undo all of her actions while some animals face near extinction.
When Eliza and Debbie discover an old treasure map on the Galapagos Islands, they set out to claim their ""riches."" Once the gold is discovered, however, greed sets in and the girls begin an all-out battle of trickery to get the gold away from each other. They battle continues all the way down to the last coin, until they accidentally lose all the gold in a fiery lava pit.
Eliza and Debbie must take over Marianne's duties when she is sick. Debbie goes with Nigel to shoot footage of a condor and Eliza must care for Donnie. Covered with feathers from a pillow, Donnie is snatched up by the condor and Eliza and Darwin must rescue him and help the condor find her real baby. In return for the favor, the condors stay on a tree branch so Debbie can get footage of them.
Hungry for adventure, Eliza convinces her mother that she should take a llama over the Andean pass, meeting her family on the other side of the mountain. However, she is disappointed when her safety-conscious father commandeers the lead. Along the journey, her frustration builds as each attempt to explore is foiled by her father's watchful eye. Finally Eliza gains new respect for her father's resourceful manner, when he saves her life.
With Nigel and Marianne off exploring bat caves, Eliza and Debbie are left at the ""eerie"" residence of colleague Dr. Renfield. Eliza becomes bent on spooking Debbie, but when her imagination gets the best of her the tables are slowly turned. By the time their parents return, the girls are convinced that the absent-minded Renfield is a vampire out to get them!
When Eliza discovers that a local performer claims he can talk to animals she believes she's found a soul mate. Eliza must enlist the help of some very ""urban"" animals to sneak into the sideshow and meet ""The Great Bangaboo.""
Eliza convinces a group of baboon-like apes to stand up to their legendary adversaries--""The Others."" Darwin, meanwhile, has met an almost identical group of apes with an identical problem. As Eliza and Darwin lead their separate groups into battle, they suddenly find themselves face-to-face--in an all out war! Now it's up to Eliza to quickly find a way avert the battle and teach the apes to get along.
Eliza will stop at nothing to get a look at the gigantic, fierce Komodo dragon that lives on the Southeast Asian islands. Her plans are halted by the unexpected arrival of her home-schooling teacher who forces her to ""hit the books."" Eliza plays a dangerous game of hooky that could cost her her ""Comvee way of life.""
When the girls discover that their parents have mistakenly taken embarrassing home movies to an awards banquet, they join forces in order to save face. Their cross-island trip turns into a race against time in order to beat their parents to the podium and stop the world from seeing them at bath time.
When Eliza sneaks out ahead of her parents in order to find a rare Sumatran rhino, she discovers that to expose his life would only lead extinction of the species. Now instead of taking the prized rhino to her parents, she must try to keep them from filming it. And the bad news is, Nigel's already on its trail!
Eliza finds a hero in a giraffe who can see distances with his height and warn others of approaching danger. However, to Eliza's dismay, the giraffe leaves the animals for his own needs. Only when Eliza herself is in danger does the giraffe return and realize his selfishness.
Eliza frees a hyena from captivity, but having never lived in the wild, it doesn't know how to survive. Eliza attempts to teach it, but it seems hopeless--until a wild boar threatens them and the hyena's natural instincts take over.
Darwin brings Eliza to his chimpanzee compound, and Eliza, who isn't used to the structure of the chimpanzee way of life, puts Darwin in an uncomfortable situation. After a fire starts, Eliza realizes the hierarchy is necessary for jungle survival. In the end, she apologizes for her lack of understanding and the chimp leader lets Darwin off the hook.
Eliza gets in over her head when she assumes responsibilities she can't handle. She is soon forced to don scuba gear and rescue a fumbling Nigel and a tumbling commvee under the dangerous waters of Australia.
Debbie discovers Eliza ""talking"" to dingoes and threatens to tell her parents. Eliza, concerned about the possibility of being shipped back to the United States as a science experiment, seeks help from nearby Aborigines. Together they confuse Debbie into thinking it was just a bad dream.
The Thornberrys meet the Fensterkopfs who make false documentaries. The Fensterkopfs' kid lies to Eliza and gets them all stuck on a cliff. After the families barely escape an avalanche, the value of truth is learned by all.
The Thornberrys discover that koalas are missing from their native groves. Eliza decides to unravel the mystery only to discover Kip and Biederman masterminding the evil plot. It is now up to her to stop the culprits from wiping out an entire species!
When the Thornberrys leave Australia for India, Eliza can't bear to leave her wombat friend, Emily. Even though she is told not to, she brings her along. Now Eliza is constantly forced to re-create Emily's habitat in order to ensure her survival.
With the commvee broken down in the desert and no water left to survive, the Thornberrys go through desperate measures to maintain their sanity.
To study and protect the snow leopards from extinction and a construction site that is threatening their survival, Nigel's mentor (thought to be lost for many years) has left civilization to be a yeti. Eliza discovers his identity, helps him fend off the construction workers, and reunites him with her father.
When the Thornberrys are in Finland for the annual reindeer races, Eliza feels left out. She single-handedly uncovers a plot to sabotage the races, and along with an equally excluded reindeer who didn't make the final cut, helps save the day by playing fair.
After Eliza saves an arctic hare from a determined stoat, she learns that underdogs come in all shapes and sizes.
When a friendly polar bear is wrongly accused of vicious behavior, Eliza goes to great lengths to keep him from being harmed and learns the value of sticking by a friend in times of trouble.
Eliza succumbs to peer pressure from a ""teenage"" elephant, which gets in the way of her closeness with Marianne on an overnight trip.
Eliza convinces a mother kangaroo that she can handle the responsibilities of baby-sitting. She quickly learns that this mischievous joey is more than meets the eye. After a close encounter with Tasmanian devils, Eliza is all too happy to relieve her duties and go back to being a kid herself.
The Thornberrys get stranded on an uncharted island, basking at first in all the beauty and the splendor, but discover soon enough that being marooned isn't all it's cracked up to be.
When Eliza is told that ""Jake"" the turtle is the last one of his kind, she can't just let his species become another name on the extinction list. Enlisting help from other animals, she soon discovers ""Samantha"" and brings the two turtles together--blind date style. Eliza soon realizes that playing the role of cupid is not as easy as it seems.
Eliza goes to desperate measures to help animals survive during tough times along the Skeleton Coast. Her good-will intentions, however, will soon cost her family their entire supply of holiday cheer--and their Christmas dinner!
When Eliza gets a hunch that foul play has led to Darwin's disappearance, she sets out to rescue her long lost companion. To her dismay, she finds Darwin has become one of the most popular acts at an Indian palace where a young prince lives. It's up to her to prove to Darwin that friendship runs deeper than the glamour and glitz of showbiz.
Eliza tells Darwin the tale of how she became able to speak to animals, and how she retained her ability to speak to humans as well.
When a seemingly abandoned panda bear imprints on Debbie, Eliza doubts Debbie's ""parenting"" ability--until a monsoon convinces Eliza that Debbie can handle more than she lets on.
Eliza reunites with a Siberian Tiger, and is stunned when the tiger turns on her. Eliza's visiting Grandma Sophie helps her overcome her fears just as she is overcoming her own.
When Donnie kidnaps an aye-aye for a pet, Eliza must return the ""bad luck"" omen to his home before the villagers hunt him down.
When the Commvee is surrounded by angry seals, Eliza tries her own methods to get them to move. But she learns from her Inuit friend Jim that traditional ways have their value.
When Kip and Biederman cause an oil spill, Eliza must save her sea otter friends.
When the Thornberrys visit the !Kung people, everyone is shocked to discover that Debbie can click-talk. No one is more surprised than Eliza, however, who is only ""cured"" of her jealousy by a !Kung healing ceremony.
When the Thornberrys visit Nigel's friend Jomo, they search for an elephant named Rebecca that Nigel saved 20 years earlier. As the family attends to an elephant stuck in a mudhole, Eliza bonds with Rebecca, only to learn that she is old and ready to die.
When Eliza ""accidentally"" reads Debbie's diary she learns that Debbie thinks she's an embarrassment of a sister. Debbie and Eliza have it out and learn the real truth about their relationship.
When Eliza tries to swim with the humpback whales, Darwin accidentally knocks Debbie's boombox into the ocean, which creates a distrubing noise and causes the whales to stop their ritual singing. Eliza attempts to set things right, but ends up getting arrested for violating the Marine Mammel Protection Act.
Challenging an ancient Maasai legend, Eliza marches into a ""haunted"" forest to prove her bravery. Now, with night falling, Eliza must place her trust in the mysterious legends of the Maasai in order to find her way safely through the dark forest.
When Eliza meets a group of temple monkeys, they con her into bringing all of her family's food. While Darwin tries to convince her otherwise, Eliza realizes that she's been duped and learns the value of Darwin's friendship.
The Thornberrys are invited on a cattle drive by Marianne's old high school friend whose son, Miguel, is not as adept at riding and roping as he claimed. In the end, Eliza helps him build confidence.
The Thornberrys are visited by the Foundation's head son, Tom, who splits up the Nigel and Marianne team. An over-zealous Tom treats Eliza like a child until he lands the Commvee in a raging river. Eliza's quick thinking prevails and she saves her family and wins Tom's respect.
During a drought, Eliza is forbidden to assist the thirsty animals, but she breaks her promise when she sees a cheetah cub alone on the Savannah. Eliza and Darwin are saved by a timely thunderstorm when the cheetah mother tries to eat them.
Eliza and a Chinese girl, Arioka, secretly switch places so Eliza can ride across the desert on camels and Arioka can ride in the Commvee. But Arioka's parents change their plans and Eliza must figure out a way to get them back to the Thornberrys.
Eliza is afraid to admit to her friend Ben that she doesn't know how to snowboard, just as a rutting ibex is afraid to stand up to another ibex.
Eliza and Debbie are fighting so much, Debbie decides to apply to boarding school and Eliza encourages her. But meeting up with a lone wolf teaches Eliza that families, like packs, belong together.
Debbie and Eliza explore the Everglades but drop Nigel's birthday present, a new watch, into the swamp. As an old woman chases them away, they return at night, only to have the watch eaten by an alligator.
Before New Year's Eve, Debbie accidentally hurts fer father's feelings, and joins a couple of eccentric, 30's-era volcano chasers, Mitzi and Merrick Dash. Eliza goes after her to reclaim her friend, Santusa the Llama, and they all encounter a mudslide when the volcano erupts.
As the family prepares to film the ""Day of the Dead"" ceremony in a small town, Eliza meets a little girl who tells her about the spirits returning. Eliza is determined to find one, but when Donnie puts a valuable ring in a loaf of bread, Debbie and Eliza must search for the missing ring. Eliza gets some help from a mysterious woman who, she finds out, has been gone for many years.
Eliza's cousin Tyler Tucker joins the Thornberrys for a four-week tour from Africa to the Amazon in search of exotic, endangered and mysterious animals.
Eliza and Tyler work together to help an aspiring Masai warrior earn the respect of his elders.
It's April Fools day, and The Thornberrys are trying to outdo each other by way of April Fool's jokes. At first it's a lot of fun, but when Tyler and Eliza encounter some quicksand and a lion, will they learn not to cry wolf? Meanwhile, Nigel coaches Debbie for her Physical Education courses.
To celebrate his 13th birthday, Tyler and Eliza visit a pair of elephants in the African savanna.
A trip to the Great Wall of China finds Eliza in hot pursuit of a panda and his mother.
In the hope of winning the annual horse race, Eliza trades in her bungling trotter for a swift Thoroughbred.
Eliza encounters a mysterious creature while shooting a film with Nigel about manta rays.
Eliza and Debbie embark on a dangerous trek in search of precious gemstones.
When Eliza and Debbie slack off on their chores, they all suffer for it when they fail to prepare of an oncoming storm. Will the Thornberrys survive a flash flood, help some beavers build their dam and keep the Comvee from sinking?
Eliza challenges Tyler to lead the group to safety after they land in an underground burial chamber.
A trip to Bhutan, finds Marianne and Debbie out in the cold, and Eliza and Darwin on the run from the border police.
Debbie and Tyler mistakenly trade the commvee for a dress at an island marketplace; Marianne and Nigel explore the Ngorongoro Crater.
Debbie is finally going to meet her e-mail friend in person and she is determined to make a good impression. Meanwhile, Eliza is having strange pains in her stomach and ends up stranded on top of a small mountain as Donnie gets attacked by a giant eagle. Just a typical Valentine's Day for the Thornberrys in Australia.
The Thornberrys visit a tribe of native New Zealanders called the Mahris who are throwing a celebration called a ""Hooey"". As Debbie flirts with a young Mahri, Eliza and Darwin have a fight. When Darwin leaves and Eliza befriends a possum named Penelope who ends up getting her into a hot air balloon that she doesn't know how to steer, will Darwin come to the rescue?
The Thornberrys meet an Australian family named the Gibsons when the Comvee runs out of gas. Eliza makes friends with the youngest member of the family named Bethany, who is in a wheelchair from cerebral palsy. The girls go land sailing and Bethany helps Eliza escape from a crocodile, but then get in an argument when Bethany thinks Eliza is feeling sorry for her being disabled. Will the two new friends find a way to make up? Meanwhile, Nigel and Marianne play the Gibsons in a very competitive game of Tricky Trivia.
Nigel and Marianne are on a dangerous assignment to film some tiger sharks while Eliza goes swimming with some dolphins. Meanwhile, Debbie gets dumped by her e-mail boyfriend Sven. When the kids take a boat out with the dolphins to swim in the deep sea, they may get some unexpected visitors.
The Thornberrys are in Africa for the opening of a new chimpanzee sanctuary which will also be attended by Jane Goodall, famous for her work with primates. When Eliza meets her and introduces her to Darwin, Dr. Goodall tells her that she disapproves of domesticated chimps. Will Eliza be able to convince her that Darwin WANTS to stay with the Thornberrys? Meanwhile, when poachers trap Eliza and Darwin, will Dr. Goodall, Nigel and Marianne be able to rescue them?
Grandpa Frank marks the occasion of his 50th wedding anniversary by throwing caution to the wind and joining Eliza on a rigorous mountain climb.
The Thornberrys are preparing for Thanksgiving in Madagascar when Grandma Sophie calls, inviting them home for the holiday. When Nigel and Marianne explain that they can't go home until they get footage of a fossa for The Foundation, Debbie throws a tantrum. Will the girls, Donnie, and Darwin go to the states on their own when tradition has always had the Thornberry clan together on Thanksgiving?
Filming penguins in Antarctica, Eliza begins practicing for her future profession as a vet, when she comes across a wounded penguin. She rescues her, but may have made matters worse by separating the penguin from her mate and her egg. When she borrows a snow speeder to get back to the penguin breeding grounds, will she make it in time to put things right? (Since Nickelodeon aired all the Thornberry episodes out of production order,they aired this as part of the 5th season.Its actually part of the 4th season)
The Thornberrys are preparing for Donnie's ""birthday"" party in Borneo when one crisis after another happens. Grandma Sophie decides to visit the same day Nigel and Marianne must capture a wild Orangutan on film or the foundation will cut their funding.
Donnie searches the jungles of Borneo for his ancestry, causing Eliza to worry that he will break ties with the Thornberry clan.
A huge fire strikes while Eliza and Darwin search for Donnie, Nigel and Marianne come across poachers, and Debbie and Grandma Sophie get taken in by a native tribe.
The Thornberrys reunite and find Donnie in a remote village and learn from the medicine woman there the terrible fate that befell his parents.
The Thornberrys pay a visit to Nigel's parents in Scotland at Thornberry Hall right before Nigel is to be made a knight by the Queen of England. Once there, Nigel's mother, Cordelia, presses him to accept a tenured professorship at Oxford. The prospect of the family settling down upsets Eliza but thrills Debbie. Meanwhile, Eliza rushes to save some golden eagles from eating poisoned meat from a trapper.
Eliza rescues her golden eagle friend from the trapper and Thornberry clan rushes to London for Nigel's knighting ceremony. After being knighted, the newly Sir Nigel most choose between becoming a teacher or continuing his adventures with his family.
At the request of the foundation, teenage rocker Shane G. joins the Thornberrys during their stay in Alaska. Since Eliza and Debbie both have a crush on Shane, they both go exploring with Shane only to discover who thick-headed he really is.
Shane and Eliza go kayaking in Alaska, and start an avalanche! If that wasn't bad enough, Debbie tries to save them, but then the commvee springs a leak!
Eliza and Shane plan to go see a old gold mine full of fool's gold, but Eliza gets jealous when Shane invites Debbie along to help with her art project.
When Eliza's friend, Kit, starts hanging out with Shane, Eliza feels left out and takes some dangerous risks to get their attention; Darwin also feels neglected.
Shane is ready to leave the Thornberrys to go back to his life as a popstar and Eliza has to be fast to tell Shane her true feelings for him before its too late. But when Shane and Eliza have a little fight and Shane runs away,can Eliza find him in time to make up and tell her feelings?
The Rugrats get tangled in an exotic adventure, where they're helped by the Thornberrys, a family that travels the world making nature documentaries.
