A large, Pete-like monster kept in the scientist's lab as a brain transplant donor. After his brain is swapped with Mickey's, he becomes infatuated with Minnie and pursues her aggressively. He battles Mickey, eventually regains his original body after an electrocution, is subdued, and later reluctantly pulls the couple's boat to Hawaii.
Julius becomes the primary antagonist after the brain swap, directly opposing Mickey.
Julius develops an obsessive romantic fixation on Minnie after seeing her photograph.
Explore the full interactive character relationship map of Runaway Brain