S4 E1 • L'origine de Donnie

Location: Borneo, IndonesiaThe 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.

Première diffusion : 18 août 2001

S4 E2 • La disparition de Donnie

Location: Borneo, IndonesiaDonnie searches the jungles of Borneo for his ancestry, causing Eliza to worry that he will break ties with the Thornberry clan.

Première diffusion : 18 août 2001

S4 E3 • Donnie en danger

Location: Borneo, IndonesiaA 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.

Première diffusion : 18 août 2001

S4 E4 • Donnie Delajungle

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.

Première diffusion : 18 août 2002

S4 E5 • Rencontre avec Jane Goodall

Location: TanzaniaThe 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?

Première diffusion : 31 octobre 2001

S4 E6 • La montgolfière

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?

Première diffusion : 1 juin 2002

S4 E7 • Trop star pour toi

S4 E8 • Folies sur la banquise

S4 E9 • La ruée vers l'or

S4 E10 • Un conflit instructif

S4 E11 • Lord Nigel

S4 E12 • Lord Nigel

S4 E13 • Incontrôlable Eliza