Littlefoot's grandfather narrates the story about the Lone Dinosaur that killed a Sharptooth. A giant monolith formed after the fight and if it's destroyed, bad luck will loom over the valley.
| Actor | Role |
|---|---|
 Thomas DekkerLittlefoot (voice) | Littlefoot (voice) |
 Kenneth MarsGrandpa (voice) | Grandpa (voice) |
 Anndi McAfeeCera (voice) | Cera (voice) |
 Aria Noelle CurzonDucky (voice) | Ducky (voice) |
 Jeff BennettPetrie / Spike (voice) | Petrie / Spike (voice) |
 Nancy CartwrightDana (voice) | Dana (voice) |
 Sandy FoxDinah (voice) | Dinah (voice) |
 Miriam FlynnGrandma (voice) | Grandma (voice) |
 John IngleCera's Dad (voice) | Cera's Dad (voice) |
 Danny MannAllosaurus (voice) | Allosaurus (voice) |
 Kris KristoffersonDoc (voice) | Doc (voice) |