Professor Julius Ferris Kelp is a
neurotic, scruffy,
buck-toothed, accident-prone, socially awkward university professor whose experiments in the classroom laboratory are unsuccessful and highly destructive. When a football-playing bully embarrasses and attacks him, Kelp decides to improve his physique by joining a local gym. Kelp's lack of physical strength leads him to seek a solution in his specialty of
chemistry. He invents a serum that causes him to fall unconscious and have a nightmare about transforming into a traditional
Dr. Jekyll and Mr. Hyde-esque monster; he then awakens as a handsome, suave, and charming
girl-chasing hipster who at his core is a brash, narcissistic sociopath. Adopting the alias "Buddy Love", Kelp uses the self-confidence of his new personality to pursue one of his students, Stella Purdy. Although she resents Love, she finds herself strangely attracted to him. Buddy wows the crowd with his jazzy, breezy musical delivery and poised demeanor at the Purple Pit, a nightclub where the students hang out. He also mocks a bartender and waitress and punches a student. The formula starts to wear off at inopportune times, often to Kelp's humiliation. Although Kelp knows that his alternate persona is an inherently bad person, he cannot prevent himself from continually taking the formula as he enjoys the attention that Love receives. Fearing the cost of the formula becoming publicly available, he sends a copy to his equally weak-willed father Elmer and overbearing mother Edwina, hoping he can entrust them with his secret. The students invite Love to perform at their annual dance, and despite skepticism from
deadpan university president Dr. Mortimer Warfield, Love charms him into being allowed to perform. Partway through Kelp's performance as Love, the formula starts to wear off again. Rather than running out to take more of the formula, Kelp allows his real identity to be revealed as he gives an impassioned speech about the importance of liking one's self, admitting his mistakes and seeking forgiveness. Stella meets Kelp backstage and confesses that she prefers Kelp over Love, leading them to share a kiss. Some time later, Elmer develops a confident personality of his own after taking the formula himself and decides to market it. He makes a pitch to the chemistry class, while Warfield endorses it, and the students all rush forward to buy the new tonic. In the commotion, Kelp, now wearing braces to correct his overbite, slips out of the class with Stella. Armed with a marriage license and two bottles of the formula, they elope. During the short closing credits, each of the characters comes out and bows down to the camera, and when Jerry Lewis, still portraying Kelp, comes out and bows, he trips and falls over the camera, shutting off the picture. ==Cast==