Jimmy's Granny comes to stay while Judy and Hugh are off on a third honeymoon. Jimmy, concerned by her ailing health, gives her his new youth tonic. However, the potion works too well - Granny ends up as a talking baby! / Through the wonder of time travel, Jimmy goes 15 years into the past to a time when his parents were swinging sweethearts. Jimmy's investment tip changes the future so that the Neutrons become fabulously rich - but with unintended consequences!
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