At first, Thunderbolt is seen as arrogant and selfish, seeming only to care about his job and his popularity. He is very popular with other dogs and Patch is his biggest fan, knowing all of his episodes by heart. As the film goes on, he becomes more kind and helpful, he and Patch start to become friends, willing to those in need and is not afraid to admit that he is just an actor. He is also cunning and highly skilled with acting, as he is able to trick the villains into believing he is having a heart attack.
A post-credits scene shows Thunderbolt with his new sidekick Patch in his TV show, The Thunderbolt Adventure Hour.