Frank Baxter
Himself (as Dr. Frank C. Baxter)
Acting
Hadley Cantrell
Himself - Princeton University Psychologist (as Professor Hadley Cantrell)
Acting
Edwin Max
Bill
Acting
Wilder Penfield
Himself - Director: Montreal Neurological Institute (as Dr. Wilder Penfield)
Acting
Peter Brown
Aristotle's student (uncredited)
Acting
Karl Swenson
Hal - the Cameraman (uncredited)
Acting