Professor Robert Leaf

James Stewart

Erasmus 'Ras' Leaf

Bill Mumy

Kenneth "Kenny" Taylor

Fabian

Vina Leaf

Glynis Johns

Pandora "Panny" Leaf

Cindy Carol

Brigitte Bardot (uncredited)

Brigitte Bardot

Peregrine Upjohn

John Williams

Doctor Volker

Jack Kruschen

Unemployment Office Clerk

Alice Pearce

George

Charles Robinson

Cliff Argyle

Jesse White

The Captain

Ed Wynn

Dean Sawyer

Howard Freeman

Terry

Jane Wald

Student at Leaf Rally

James Brolin

Blonde Doll (Upjohn's Girl)

Susanne Cramer

Lt. Rink

Gene O'Donnell

Von Schlogg

Orville Sherman

Schoolteacher

Maida Severn

Bank Manager

Pitt Herbert

Saleslady

Louise Lane

Saleslady

Adair Jameson

Blonde Doll

Susan Cramer

T-Man

Harry Fleer

Ticket Seller

Jack Daly

Cashier

William Henry

Prof. Bums

Gloria Clark

Student

Robert Fitzpatrick

Student

Clive Clerk

Student

John Stevens

Sports Announcer

Dick Lane

Postman

Ted Mapes

Taxi Driver

Marcel De la Brosse

Orville

Bob Biheller