We're Back! A Dinosaur's Story The film opens with a trio of young bluebirds harassing their youngest sibling, Buster (Blaze Berdahl). As Buster leaves his family, he meets an intelligent orange T. rex named Rex (John Goodman) playing golf. He explains to Buster that he was once a ravaging dinosaur, and proceeds to tell the story of how he came to become what he is today.