Ernie, Julia, and Max accidentally start a time-machine and find themselves back in time 65 million years, where they are adopted by a doting dinosaur mom and a rambunctious dinosaur brother while, back in the present day, their parents plot their rescue.
| Actor | Role |
|---|---|
 Melanie GriffithTyra | Tyra |
 Jane LynchSue | Sue |
 William BaldwinSarco | Sarco |
 Stephen BaldwinSurly | Surly |
 Bob SchneiderDodger | Dodger |
 Pamela AdlonErnie | Ernie |
 Yuri LowenthalMax | Max |
 Tara StrongJulia | Julia |
 Fred TatascioreDr. Santiago | Dr. Santiago |
 Nolan NorthMorris | Morris |
| TTom KennyBoris, Guard #2, Tour Guide, Burger Attendant | Boris, Guard #2, Tour Guide, Burger Attendant |
 John DiMaggioHorace, Big Guard | Horace, Big Guard |
 Grey DeLisleBaby T-rex | Baby T-rex |