Professor Robert Leaf
James Stewart
Kenneth 'Kenny' Taylor
Fabian
Terry, George's Wife
Jane Wald
Student at Leaf Rally
James Brolin
Blonde Doll (Upjohn's Girl)
Susanne Cramer
The Captain
Ed Wynn
Eugenia Clove
Paula Lane
Orville
Robert Biheller
Office Clerk
Alice Pearce
Vina Leaf
Glynis Johns
Pandora 'Panny' Leaf
Cindy Carol
Erasmus 'Ras' Leaf
Bill Mumy
Peregrine Upjohn
John Williams
Brigitte Bardot
Doctor Volker
Jack Kruschen
George
Charles Robinson
Dean Sawyer
Howard Freeman
Writers' Assistant
Nunnally Johnson
Director
Henry Koster
Producer
Writer
Hal Kanter
Director of Photography
Lucien Ballard
Sound
Elmer Raguse
Original Music Composer
George Duning
Makeup Artist
Ben Nye
Novel
John Haase
Editor
Marjorie Fowler
Art Direction
Malcolm Brown
Assistant Property Master
Dennis J. Parrish
Costume Design
Moss Mabry
Special Effects
L.B. Abbott
Emil Kosa Jr.
Art Cruickshank
Hairstylist
Margaret Donovan
Set Decoration
Walter M. Scott
Lynn F. Reynolds
Assistant Director
Fred R. Simpson
Fred Kohlmar
Jack Martin Smith
Orchestrator
Arthur Morton
Steven Potter
Alfred Bruzlin