Trailer
 | Lacey Chabert as Eliza Thornberry (voice) |
 | Jodi Carlisle as Marianne Thornberry (voice) |
 | Tim Curry as Nigel Thornberry (voice) |
 | Flea as Donald 'Donnie' Michael Thornberry (voice) |
 | Danielle Harris as Debbie Thornberry (voice) |
 | Tom Kane as Darwin (voice) |
 | Betty White as Grandma Sophie (voice) |
 | Alan Henry Brown as Sri Mayasandra (voice) |
 | Arthur Burghardt as Rhino / Monkey (voice) |
 | Cara DeLizia as Baru / Monkey (voice) |
 | Moira Quirk as Rehabilitation Worker / Monkey (voice) |
 | Dwight Schultz as Badouk / Monkey / Poacher (voice) |
| Tuan Tran as Kickboxing Instructor (voice) |
 | Alfre Woodard as Medicine Woman (voice) |
 | Dee Bradley Baker as Parrots (voice) |
 | Patti Deutsch as Female Rhinoceros Hornbill (voice) |
 | Clyde Kusatsu as Sun Bear (voice) |
 | David Paymer as Male Rhinoceros Hornbill (voice) |
| Maureen Quinn as Lugan (voice) |
 | Pamela Adlon as Saiful (voice) |
| Jusak Bernhard as Tribal Man / Villager / Poacher (voice) |
| Denny Chandra as Villager (voice) |
 | Tania Gunadi as Villager / Forest Animal (voice) |
| Malik Nasution as Villager (voice) |
 | Benny Tjandra as Villager (voice) |
 | Earl Boen as Bearded Pig / Poacher (voice) |
 | Leila Kenzle as Squirrel / Forest Animal (voice) |
 | Candi Milo as Civat Cat / Mousedeer / Forest Animal (voice) |
 | Pat Musick as Ona / Owl / Forest Animal (voice) |
 | Julia Nickson as Villager / Forest Animal / Donnie's Mother (voice) |
 | Amy Hill as Ibu (voice) |
| Michael Moertl as Villager / Donnie's Father (voice) |
| Directing | |
| Joseph Scott | Director |
Art | |
| Tron Mai | Storyboard Artist |
| Max Martinez | Storyboard Artist |
Production | |
| Gábor Csupó | Executive Producer |
Editing | |
| Peter Tomaszewicz | Editor |
Art | |
| Rudi Berden | Storyboard Artist |
| Gabi Payn | Storyboard Artist |
Sound | |
| Drew Neumann | Music |
Production | |
| Kate Boutilier | Producer |
| Barbara Wright | Casting |
Directing | |
| Carol Millican | Director |
Art | |
| Robert Goodin | Storyboard Artist |
| Pablo Solís | Storyboard Artist |
| Al Zegler | Storyboard Artist |
Sound | |
| Gregory Hinde | Music |
Directing | |
| Dean Criswell | Director |
Art | |
| Karen Ciraulo | Storyboard Artist |
Writing | |
| Sheila M. Anthony | Writer |
| Joan Considine Johnson | Writer |
Production | |
| Maureen Iser | Producer |
Art | |
| Monika Tomova | Storyboard Artist |
Directing | |
| Ron Noble | Director |
Production | |
| Arlene Klasky | Executive Producer |
