Nature called, look who answered Adam Sandler? In Columbia Pictures comedy Big Daddy Adam Sandler (Sonny Koufax) plays an immature law school graduate in a struggle to get his girlfriend back thinks taking care of his roommate Kevins (John Stewart) son will make her return, but things dont work out as planned. As she falls for a much older man, Sonny is left to take care of the kid alone till Kevin returns. In the time they have, Sonny grows to love the kid and only makes him (Sonny) grow up and realize he has to change a lot in his life.