 | Richard Basehart als Roy Martin / Roy Morgan |
 | Scott Brady als Police Sgt. Marty Brennan |
 | Roy Roberts als Police Captain Breen |
 | Whit Bissell als Paul Reeves |
 | James Cardwell als Police Sgt. Chuck Jones |
 | Jack Webb als Lee Whitey |
 | Reed Hadley als Narrator (voice) (uncredited) |
 | Frank Cady als Pete Hammond |
 | Dorothy Adams als Milk Customer |
 | Jane Adams als Nurse Scanion (uncredited) |
 | Jack Bailey als Witness in Pajamas and Robe (uncredited) |
 | Alma Beltran als Miss Montalvo (uncredited) |
 | Robert Bice als Detective with Capt. Breen (uncredited) |
| Dolores Castelli als Witness (uncredited) |
| George Chan als Chinese Suspect (uncredited) |
 | Garrett Craig als Patrolman (uncredited) |
 | John Dehner als Assistant Bureau Chief (uncredited) |
 | Ann Doran als Dispatcher (uncredited) |
 | Rex Downing als Young Hoodlum (uncredited) |
| Michael Dugan als Patrolman (uncredited) |
 | Paul Fierro als Spanish-Speaking Detective (uncredited) |
 | Byron Foulger als Freddie (uncredited) |
| Kay Garrett als Doctor (uncredited) |
| Tim Graham als Uniformed Sergeant (uncredited) |
 | Kit Guard als Suspect (uncredited) |
 | Harry Harvey als Liquor Store Proprietor (uncredited) |
 | Thomas Browne Henry als Dunning (uncredited) |
| Peter Hobbes als Milkman (uncredited) |
 | Virginia Hunter als Miss Smith (uncredited) |
| Felice Ingersoll als Records Clerk (uncredited) |
 | Anthony Jochim als Liquor Store Proprietor (uncredited) |
| Stan Johnson als Artist (uncredited) |
| Louise Kane als Mrs. Rawlins (uncredited) |
 | Tommy Kelly als Redhead (uncredited) |
 | Donald Kerr als Mailman (uncredited) |
 | Charles Lang als Policeman (uncredited) |
 | Lyle Latell als Police Sergeant (uncredited) |
 | Rory Mallinson als Detective with Harry (uncredited) |
 | Billy Mauch als Handsome (uncredited) |
 | John McGuire als Officer Robert Rawlins (uncredited) |
 | Charles Meredith als Hollywood Police Official (uncredited) |
| Carlotta Monti als Miss Montavio (uncredited) |
| Bert Moorhouse als Detective (uncredited) |
 | Howard Negley als Lt. Greeson (uncredited) |
 | James Nolan als Harry (uncredited) |
 | John Parrish als Liquor Store Proprietor (uncredited) |
 | Steve Pendleton als Detective (uncredited) |
| John Perri als Young Hoodlum (uncredited) |
 | Paul Scardon als Liquor Store Proprietor (uncredited) |
 | Kenneth Tobey als Detective Questioning Pete (uncredited) |
 | Wally Vernon als Postman (uncredited) |
 | Harlan Warde als Police Operator 27 (uncredited) |
 | Mary Ware als Reeves' Secretary (uncredited) |
 | Robert B. Williams als Detective (uncredited) |
 | Harry Wilson als Prison Inmate (uncredited) |
| Alfred L. Werker | Director |
| Crane Wilbur | Story |
| Crane Wilbur | Screenplay |
| John C. Higgins | Screenplay |
| Harry Essex | Additional Dialogue |
| Bryan Foy | Producer |
| Robert Kane | Producer |
| Leonid Raab | Original Music Composer |
| John Alton | Director of Photography |
| Alfred DeGaetano | Editor |
| Edward L. Ilou | Art Direction |
| Armor Marlowe | Set Decoration |
| Clarence Steensen | Set Decoration |
| Joe Stinton | Makeup Artist |
| Ern Westmore | Makeup Artist |
| Leon Becker | Sound |
| Hugh McDowell Jr. | Sound |
| James T. Vaughn | Production Supervisor |
| Howard W. Koch | Assistant Director |
| Lester Shorr | Camera Operator |
| Stewart Stern | Other |
| Anthony Mann | Co-Director |
