Steve Martin takes his wild and crazy persona and splits it into an hilarious battle of the sexes within the same body. Ambitious attorney Roger Cobb is assigned to alter the will of ailing millionaire Edwina Cutwater (Lily Tomlin), who wishes to bequeath her estate to a healthy young woman (Victoria Tennant), after Cutwater's guru transfers the old eccentric's soul to her healthy body. No one believes for a second it will actually work until Ms. Cutwater awakens in Roger's body and he becomes, literally, a man possessed, fighting for control of himself.