Cary Grant is the professor "Fulton" working for "Oxley" (Charles Coburn) on a project to find some way of turning back time and reversing the ageing process. They are experimenting with various formulae on a selection of rather agile chimps, and it's actually one of them who manages to co come up with a solution that when, inadvertently, added to the water in the cooler manages to turn the academic into a small child. He also feels a bit like a new man, too! This wears off after a short while, so he gets his wife "Edwina" (Ginger Rogers) to sit in on his next experiment - only this time he…