Research chemist Barnaby Fulton works on a fountain of youth pill for a chemical company. One of the labs chimps gets loose in the laboratory and mixes chemicals, but then pours the mix into the water cooler. When trying one of his own samples, washed down with water from the cooler, Fulton begins to act just like a twenty-year-old and believes his potion is working. Soon his wife and boss are also behaving like children.
An airline pilot pursues a live-in babysitter at his hotel and gradually realizes she is not as stable as perhaps she should be.
Vicious gangster Vincent Canelli pulls off a daring prison escape just moments before going to the electric chair, taking with him Peter Manning – a bank robber and cop killer who was to die right after him. Taking several hostages along, they try to get their hands on the loot from Manning’s robbery to finance their escape from the country.
