On a day known to the dinosaurs as "Treasure Day", Bron becomes stuck in the Mysterious Beyond. This event urges the young Longneck Littlefoot to take his friends on a quest to the Fire Mountain to save his father. Along the way, they befriend a Flyer.
| Actor | Role |
|---|---|
 Felix AvitiaLittlefoot (voice) | Littlefoot (voice) |
 Anndi McAfeeCera / Petrie's Mom / Digger (voice) | Cera / Petrie's Mom / Digger (voice) |
 Aria Noelle CurzonDucky / Digger (voice) | Ducky / Digger (voice) |
 Jeff BennettPetrie / Digger (voice) | Petrie / Digger (voice) |
 Rob PaulsenSpike / Skinny Digger (voice) | Spike / Skinny Digger (voice) |
 Barry BostwickGrandpa (voice) | Grandpa (voice) |
 Miriam FlynnGrandma (voice) | Grandma (voice) |
 Damon Wayans Jr.Wild Arms (voice) | Wild Arms (voice) |
 Reba McEntireEtta (voice) | Etta (voice) |
 Scott WhyteBron (voice) | Bron (voice) |
 Meghan StrangeRuby / Mama Swimmer (voice) | Ruby / Mama Swimmer (voice) |
 Tony AmendolaNarrator (voice) | Narrator (voice) |
| GGeorge BallCera's Dad (voice) | Cera's Dad (voice) |
 Issac Ryan BrownChomper (voice) | Chomper (voice) |