Eddie Murphy is back and he's bigger than ever in this updated version of the 1962 Jerry Lewis classic. Professor Sherman Klump (Murphy) is an overweight, socially inept scientist who invents a formula that can change human metabolism. In order to win the heart of the beauteous Carla Purty (Pinkett), he takes his own formula and Buddy Love is born, a slender and overconfident version of Klump. In a Jekyll-and-Hyde-like clash between Klump and Love, who'll win? In addition to Klump and Love, Murphy also plays the roles of his mother, father, grandmother and brother.