John believes he has discovered the secret of the Fountain of Youth, so he calls a press conference to announce his discovery.
While on a trip to Florida, John Martin stumbles upon the legendary fountain of youth and sips a handful of the liquid. The consequences are unforeseeable, for he begins to revert to his childhood at certain times that are neither predictable nor controllable.
Big John is cast as Captain Hook in his school's production of Peter Pan, while Little John ends up having to play Peter Pan at the same time.
John tries a new formula in the laboratory that he hopes will cure him from his conversions.