A timid, nearsighted chemistry teacher discovers a magical potion that can transform him into a suave and handsome Romeo. The Jekyll and Hyde game works well enough until the concoction starts to wear off at the most embarrassing times.

Jerry Lewisas Professor Julius F. Kelp / Buddy Love / Baby Kelp
Stella Stevensas Stella Purdy
Del Mooreas Dr. Hamius R. Warfield
Henry Gibsonas Gibson, College Student
Kathleen Freemanas Millie Lemmon
Richard Kielas Man in Gym (uncredited)
Norman Aldenas Football Player
Howard Morrisas Mr. Elmer Kelp
Elvia Allmanas Edwina Kelp
Milton Fromeas Dr. M. Sheppard Leevee