Big John, Little John
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Big John, Little John was a Saturday morning NBC sitcom from 1976 produced by Sherwood Schwartz which starred Robbie Rist as the young lead, and Herb Edelman as the elder John.
The show centered around a 45-year-old school teacher named John Martin (played by Edelman). While vacationing in Florida, he discovered the real Fountain of Youth. He took a small drink from it and changed into a 12-year-old boy (played by Rist), and back again. Martin had no control over when the change would occur. Only his immediate family knew about the recurring changes and, to explain the appearance of the 12-year-old John, claimed that he was their nephew.
Throughout the series, John unsuccessfully tried to find a cure for his predicament.
One of the regulars on Big John, Little John was Kristoff St. John, who would go on to The Young and The Restless fame.