Dr. Henry Jekyll (Spencer Tracy) believes good and evil exist in everyone. Experiments reveal his evil side, named Mr. Hyde. Experience teaches him how evil and violent Hyde can be: he rapes Ivy Pearson (Ingrid Bergman), who earlier expressed interest in Jekyll. Meanwhile, Jekyll is preparing to marry Beatrix Emery (Lana Turner). Over the course of the film, Hyde abuses Ivy. Feeling remorse over the treatment inflicted on Ivy by his “monstrous” counterpart, Jekyll vows never to take the serum again, destroys the key to his lab, and sends money to Ivy anonymously. Ivy believes the money was sent by Hyde in order to trick her into believing she is now free. On the advice of a friend over her rattled nerves, she goes to Jekyll for comfort. Jekyll promises that Hyde will never hurt her again.