 | Frank Baxter als Himself (as Dr. Frank C. Baxter) |
 | Hadley Cantrell als Himself - Princeton University Psychologist (as Professor Hadley Cantrell) |
 | Edwin Max als Bill |
| Wilder Penfield als Himself - Director: Montreal Neurological Institute (as Dr. Wilder Penfield) |
 | Peter Brown als Aristotle's student (uncredited) |
 | Karl Swenson als Hal - the Cameraman (uncredited) |
| Owen Crump | Director |
| Henry F. Greenberg | Writer |
| Donald A. Peters | Art Direction |
| William L. Kuehl | Set Decoration |
| Fred MacDowell | Editor |
| Ellis W. Carter | Director of Photography |
| Owen Crump | Producer |
