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, Thunderbolt becomes more kind and helpful, and he and Patch start to become friends. Furthermore, he is willing to assist those in need and is not afraid to admit that he's just an actor. Thunderbolt is also cunning and highly skilled with his acting, as seen when he tricks Cruella De Vil, the Baduns, and Lil' Lightning into believing that 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."
Thunderbolt appears in "Watch for Falling Idols," where he and his creators arrive on the Dearly Farm to film their next episode. Lucky is thrilled to meet his idol and tells Thunderbolt that he's his biggest fan and has seen all of his TV shows. However, when Lucky finds out that Thunderbolt doesn't do his own stunts (after Thunderbolt panics from being lifted off the ground, due to his fear of heights), he loses faith in him. Later on, Lucky tries to prove that he is brave by climbing up the TV windmill, but puts himself in danger instead. Fortunately, Thunderbolt (who pushes his fears aside) rescues his young fan. Lucky thanks Thunderbolt who tells him that a hero isn't one who fears nothing, but is one who is willing to overcome his fears. Lucky agrees with Thunderbolt and they reconcile.
Thunderbolt unhappy on what he did with Lucky
Thunderbolt riding on a jetski
Thunderbolt gets the diamond bone
Thunderbolt at his mobile doghouse
Thunderbolt in his hot tub with Lucky
Thunderbolt with Rolly
Thunderbolt in a car
Thunderbolt with Lucky and Dumpling
Thunderbolt with Jock in Patch's London Adventure