While vacationing in Florida a
forty-year-old middle school science teacher named John Martin
drinks from a spring which turns out to be the legendary
Fountain of Youth. Returning home, the effects of the water
change him into a twelve-year-old boy, and back again. Martin
has no control over when the changes will occur, because he only
took a sip of the water, and not a full drink, which explains
why the changes are recurring and not permanent.