Conservationists Jim and Jean Thomas braved the steamy jungles of Papua New Guinea to save a tree kangaroo from extinction and ended up providing water and sanitation to ten thousand people in one of the most remote places on earth.
| Actor | Role |
|---|---|
 David AttenboroughSelf - Narrator | Self - Narrator |
 Jane GoodallSelf | Self |
| TTim FlannerySelf | Self |
 François MontagutNarrator French version (voice) | Narrator French version (voice) |
| LLudivine MaffrenNarrator French version (voice) | Narrator French version (voice) |
 Michel LaroussiNarrator French version (voice) | Narrator French version (voice) |
| PPhilippe LejourNarrator French version (voice) | Narrator French version (voice) |
| LLaurent LarcherNarrator French version (voice) | Narrator French version (voice) |