Professor Irwin Plump is an incredibly fat and good-hearted man. He is a college professor on the verge of a breakthrough in DNA restructuring when he meets an admirer of his, named Veronica, who is a teacher new to Plump's college. He is deeply in love with her, but is frustrated be grossly overweight. He then decides to test a formula on which he's been working on himself. He is then transformed into the lecherous jerk, Buddy Steele, and romantic complications ensue.