The Great Valley turns barren and herds of dinosaurs have to find another place to inhabit. Cera, Littlefoot and Petrie, all kids, leave to find food and get stranded on a lush unknown island.
| Actor | Role |
|---|---|
 John IngleNarrator / Cera's Father (voice) | Narrator / Cera's Father (voice) |
 Brandon La CroixLittlefoot (voice) | Littlefoot (voice) |
 Aria Noelle CurzonDucky (voice) | Ducky (voice) |
 Rob PaulsenSpike (voice) | Spike (voice) |
 Anndi McAfeeCera (voice) | Cera (voice) |
 Jeff BennettPetrie / Mr. Clubtail (voice) | Petrie / Mr. Clubtail (voice) |
 Kenneth MarsGrandpa (voice) | Grandpa (voice) |
 Miriam FlynnGrandma (voice) | Grandma (voice) |
 Tress MacNeilleDucky's Mother / Petrie's Mother (voice) | Ducky's Mother / Petrie's Mother (voice) |
| CCannon YoungChomper (voice) | Chomper (voice) |
 Christina PicklesElsie (voice) | Elsie (voice) |
 Thomas DekkerLittlefoot (singing voice) | Littlefoot (singing voice) |