 Lon Chaney Jr.Dan McCormick | Dan McCormick |
 Lionel AtwillDr. Paul Rigas | Dr. Paul Rigas |
 Anne NagelJune Lawrence | June Lawrence |
 Frank AlbertsonMark Adams | Mark Adams |
 Samuel S. HindsDr. John Lawrence | Dr. John Lawrence |
 William B. DavidsonDistrict Attorney Ralph B. Stanley | District Attorney Ralph B. Stanley |
 Ben TaggartDetective Sergeant Regan | Detective Sergeant Regan |
 Constance BergenNurse | Nurse |
 Ivan MillerDoctor | Doctor |
 Chester GanChinese Boy, Wong | Chinese Boy, Wong |
 George MeaderDr. Bruno | Dr. Bruno |
 Frank O'ConnorDetective | Detective |
 John DilsonMedical Examiner | Medical Examiner |
 Byron FoulgerAlienist #2 | Alienist #2 |
 Jessie ArnoldMrs. Frank Davis (uncredited) | Mrs. Frank Davis (uncredited) |
 James BlaineCharlie, Prison Guard (uncredited) | Charlie, Prison Guard (uncredited) |
| GGary BrecknerRadio Announcer (uncredited) | Radio Announcer (uncredited) |
| LLowell DrewJury Foreman (uncredited) | Jury Foreman (uncredited) |
| JJohn EllisAssistant District Attorney (uncredited) | Assistant District Attorney (uncredited) |
 Douglas EvansPolice Radio Announcer (uncredited) | Police Radio Announcer (uncredited) |
| JJack GardnerReporter (uncredited) | Reporter (uncredited) |
 William HallMike - Dynamo Operator (uncredited) | Mike - Dynamo Operator (uncredited) |
 Russell HicksWarden Harris (uncredited) | Warden Harris (uncredited) |
| WWright KramerJudge (uncredited) | Judge (uncredited) |
| TTom QuinnDetective (uncredited) | Detective (uncredited) |
 Bob ReevesPrison Guard (uncredited) | Prison Guard (uncredited) |
| MMel RuickDefense Attorney (uncredited) | Defense Attorney (uncredited) |
| FFrancis SaylesFrank Davis (uncredited) | Frank Davis (uncredited) |
| PPaul ScottPrison Chaplain (uncredited) | Prison Chaplain (uncredited) |
 David SharpeHay Wagon Passenger (uncredited) | Hay Wagon Passenger (uncredited) |
