 | Rondo Hatton als Hal Moffet AKA 'The Creeper' |
 | Tom Neal als Clifford Scott |
 | Jan Wiley als Virginia Rogers Scott |
 | Jane Adams als Helen Paige |
 | Donald MacBride als Police Captain M. J. Donelly |
 | Peter Whitney als Police Lieutenant Gates |
 | Fred Coby als Young Hal Moffet |
| Janelle Johnson Dolenz als Joan Bemis (as JaNelle Johnson) |
| Mary Ann Bricker als Mary Ann Obringer (uncredited) |
 | Tris Coffin als Police Lieutenant / voice of radio announcer (uncredited) |
 | Joseph Crehan als Police Commissioner Salisbury (uncredited) |
 | John Hamilton als Professor Cushman (uncredited) |
 | Frank O'Connor als Policeman at Helen's Apartment (uncredited) |
 | Beatrice Roberts als Nurse (uncredited) |
 | Charles Wagenheim als Pawnbroker (uncredited) |
| William Ruhl als Policeman at Helen's Apartment (uncredited) |
 | James Nolan als Police Dispatcher (uncredited) |
 | Oscar O'Shea als Mr. Haskins - Grocer (uncredited) |
 | Patrick McVey als Detective at Helen's Apartment (uncredited) |
| Warren Jackson als Jeweler (uncredited) |
| Jean Yarbrough | Director |
| M. Coates Webster | Writer |
| Jack Pierce | Makeup Artist |
| Philip Cahn | Editor |
| Maury Gertsman | Director of Photography |
| Dwight V. Babcock | Story |
| Russell A. Gausman | Set Decoration |
| Edward R. Robinson | Set Decoration |
| Ralph Slosser | Assistant Director |
| Carmen Dirigo | Hairstylist |
| Joe Lapis | Sound Engineer |
| Vera West | Costume Design |
| Abraham Grossman | Art Direction |
| George Bricker | Writer |
| Ben Pivar | Producer |
| John B. Goodman | Art Direction |
| Bernard B. Brown | Sound Director |
| Raymond Kessler | Dialogue Coach |
