 | Lon Chaney Jr. als Prof. Norman Reed |
 | Anne Gwynne als Paula Clayton Reed |
 | Evelyn Ankers als Illona Carr |
 | Ralph Morgan als Prof. Millard Sawtelle |
 | Elisabeth Risdon als Dean Grace Gunnison |
 | Lois Collier als Margaret Mercer |
 | Harry Hayden als Dean Septimus Carr |
 | Elizabeth Russell als Evelyn Sawtelle |
 | Phil Brown als David Jennings |
 | Kay Harding als Student |
 | Gertrude Astor als Party Guest (uncredited) |
 | Edmund Mortimer als Party Guest (uncredited) |
 | Larry Steers als Party Guest (uncredited) |
 | Chuck Hamilton als The Carpenter (uncredited) |
 | David Hoffman als The Spirit of the Inner Sanctum (uncredited) |
 | William Hudson als Second Gossiping Male Student (uncredited) |
 | Milburn Stone |
| Reginald Le Borg | Director |
| Fritz Leiber Jr. | Novel |
| Scott Darling | Adaptation |
| Oliver Drake | Associate Producer |
| Ben Pivar | Producer |
| Virgil Miller | Director of Photography |
| Paul Sawtell | Original Music Composer |
| John B. Goodman | Art Direction |
| Richard H. Riedel | Art Direction |
| Russell A. Gausman | Set Decoration |
| A.J. Gilmore | Set Decoration |
| William Tummel | Assistant Director |
| Milton Carruth | Editor |
| Brenda Weisberg | Screenplay |
| Bernard B. Brown | Sound Director |
| William Hedgcock | Sound |
| John P. Fulton | Visual Effects |
| Vera West | Costume Designer |
