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
Brad Johnson
— Student
Billy Mauch
— Student (as Bill Mauch)
Ann Tyrrell
— Telephone Operator
Peggy
— Bonzo