The theory of evolution has never been so zanily tested. When Professor Peter Boyd (Ronald Reagan) proposes to the Dean's daughter, there's only one problem: her father. In an attempt to win his approval, he adopts Bonzo and sets out to prove "right and wrong" is learned, not inherited. He hires a beautiful young nursemaid to mother Bonzo, but will his fiancee believe it's all just in the name of science? This hilarious romp proves some people will do anything for love.