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College prof Peter Boyd tries to salvage his professional and personal reputation by using a lab chimp to prove that environment trumps heredity in behavioral development.

Ronald Reagan
Professor Peter Boyd

Diana Lynn
Jane

Walter Slezak
Professor Hans Neumann
Lucille Barkley
Valerie Tillinghast

Jesse White
Babcock

Herbert Heyes
Dean Tillinghast

Herb Vigran
Lt. Daggett

Harry Tyler
Knucksy
Edward Clark
Fosdick (as Ed Clark)

Edward Gargan
Policeman (as Ed Gargan)

Joel Friedkin
Mr. De Witt
Brad Browne
Chief of Police
Elizabeth Flournoy
Miss Swithen (as Elizabeth Flourney)
Howard Banks
Policeman
Perc Launders
Fireman