James Stewart

Professor Robert Leaf

Fabian

Kenneth 'Kenny' Taylor

Glynis Johns

Vina Leaf

Cindy Carol

Pandora 'Panny' Leaf

Bill Mumy

Erasmus 'Ras' Leaf

John Williams

Peregrine Upjohn

Brigitte Bardot

Brigitte Bardot

Jack Kruschen

Doctor Volker

Charles Robinson

George

Howard Freeman

Dean Sawyer

Jane Wald

Terry, George's Wife

James Brolin

Student at Leaf Rally

Susanne Cramer

Blonde Doll (Upjohn's Girl)

Ed Wynn

The Captain

Paula Lane

Eugenia Clove

Henry Koster