Mickey panics over how he can make enough money for the trip when Pluto shows him the want ads and Mickey sees an ad from Doctor Frankenollie to earn the amount of money that he needs for "a mindless day's work". Upon arriving at Frankenollie's residence, Mickey is dropped down a trapdoor into the scientist's laboratory, where he reveals his plan to switch his donor's brain with that of his enormous Pete-resembling monster, Julius. The experiment causes an explosion that takes Frankenollie's life, but it is a success, nonetheless, as Mickey and Julius' brains are switched. In his new body, Julius finds Mickey's wallet and notices a photo of Minnie, with whom he instantly becomes smitten. He escapes from the laboratory and finds Minnie while she is shopping for swimsuits. After Minnie immediately mistakes Julius for Mickey, the latter arrives to save her, but Minnie becomes terrified of him due to the appearance of Julius' body and panics, until Mickey convinces her of who he is and places her on the top of a skyscraper for safety. As Julius continues to pursue Minnie and a battle between him and Mickey occurs, they land on a telephone line and become electrocuted, sending their brains back into their proper bodies. Continuing their fight at the skyscraper where Minnie is, Mickey manages to subdue Julius using a billboard advertising the trip to Hawaii there and save her. Mickey and Minnie eventually travel to Hawaii together on an inflatable boat pulled by Julius, who is goaded by Mickey into chasing after the photo of Minnie in his wallet.