Pixar has debuted the first full-length trailer for “The Good Dinosaur,” expanding on the premise introduced in the previously released teaser: What if that enormous asteroid missed Earth, and dinosaurs never became extinct -- and what if a dinosaur and a cave boy met and became the best of friends?

Directed by Peter Sohn from a story by Enrico Casarosa and Bob Peterson, “The Good Dinosaur” centers on Arlo, a lively Apatosaurus who set out on an epic journey, gaining a human boy as an unlikely companion.

Opening Nov. 25, the film features the voice talents of Lucas Neff, Neil Patrick Harris, Bill Hader, John Lithgow, Frances McDormand, and Judy Greer.