Frank Baxter

Himself (as Dr. Frank C. Baxter)

Hadley Cantrell

Himself - Princeton University Psychologist (as Professor Hadley Cantrell)

Edwin Max

Bill

Wilder Penfield

Himself - Director: Montreal Neurological Institute (as Dr. Wilder Penfield)

Peter Brown

Aristotle's student (uncredited)

Karl Swenson

Hal - the Cameraman (uncredited)

Henry F. Greenberg

Writer

Owen Crump

Director

William L. Kuehl

Set Decoration

Ellis W. Carter

Director of Photography

Donald A. Peters

Art Direction

Fred MacDowell

Editor

Owen Crump

Producer