Cary Grant
Barnaby Fulton
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.
Monkey Business
Barnaby Fulton
Edwina Fulton
Oliver Oxley
Lois Laurel
Hank Entwhistle
Jerome Kitzel
Dr. Zoldeck
GJ Culverly
Dr. Brunner
Mrs. Rhinelander
Little Indian
Oxley Receptionist (uncredited)
Reporter (uncredited)
Man at Pool (uncredited)
Student (uncredited)
Scientist (uncredited)
Dowager (uncredited)
Club Patron (uncredited)
Johnny's Mother (uncredited)
Scientist (uncredited)
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