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 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!

Location: Rotura, New ZealandThe 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?

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? (This was possibly the series finale.The show has been put to hiatus after this episode but never returned.)

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'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.

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.

Location: The Florida Everglades, United StatesDebbie 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.

Location: Lake Baikal, SiberiaWhen 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?

Location: Alice Springs, AustraliaDebbie 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.

Location: Shark Bay, AustraliaNigel 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.

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.

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.

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.

Location: Ha Long Bay, VietnamEliza encounters a mysterious creature while shooting a film with Nigel about manta rays.

Location: Borneo, IndonesiaThe Thornberrys reunite and find Donnie in a remote village and learn from the medicine woman there the terrible fate that befell his parents.

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!

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.

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.

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 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.

With the commvee broken down in the desert and no water left to survive, the Thornberrys go through desperate measures to maintain their sanity. However, on the verge of dehydration, Eliza convinces her family to perform the rain ritual pictured in a nearby monolith. Everyone cheers as the rains pour down among them.