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| Jeff Bennett | Mutt / Petrie / Iguanadon [Voice] | |
| Linda Gary | Grandma [Voice] / Mother Quetzalcoatlus | |
| Nicholas Guest | Hyp's Father [Voice] | |
| Whitby Hertford | Hyp [Voice] | |
| Heather Hogan | Ducky [Voice] | |
| Candace Hutson | Cera (voice) | |
| John Ingle | Narrator / Cera's Father [Voice] | |
| Tress MacNeille | Stegosaurus [Voice] / Spike / Ducky's Mother [Voice] | |
| Scott McAfee | Littlefoot (voice) | |
| Rob Paulsen | Spike [Voice] | |
| Whit Hertford | Hyp (voice) (as Whitby Hertford) | |
| Candy Hutson | Cera | |
| Kenneth Mars | Littlefoot | |
| Scott Menville | Nod |
| Director |
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| Producer | Zahra Dowlatabadi
Roy Allen Smith |
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| Writer | John Loy
John Ludin Dev Ross |
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A nearby meteorite crash blocks off the dinosaurs' water supply, starting an ecological chain-reaction that threatens life in the valley. All the dinosaurs, including a group of stupid bullies, must cooperate in an effort to free the blockage, which involves a risky venture outside the valley. |
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