Richard Basehart as Roy Martin / Roy Morgan

Scott Brady as Police Sgt. Marty Brennan

Roy Roberts as Police Captain Breen

Whit Bissell as Paul Reeves

James Cardwell as Police Sgt. Chuck Jones

Jack Webb as Lee Whitey

Reed Hadley as Narrator (voice) (uncredited)

Frank Cady as Pete Hammond

Dorothy Adams as Milk Customer

Jane Adams as Nurse Scanion (uncredited)

Jack Bailey as Witness in Pajamas and Robe (uncredited)

Alma Beltran as Miss Montalvo (uncredited)

Robert Bice as Detective with Capt. Breen (uncredited)

Dolores Castelli as Witness (uncredited)

George Chan as Chinese Suspect (uncredited)

Garrett Craig as Patrolman (uncredited)

John Dehner as Assistant Bureau Chief (uncredited)

Ann Doran as Dispatcher (uncredited)

Rex Downing as Young Hoodlum (uncredited)

Michael Dugan as Patrolman (uncredited)

Paul Fierro as Spanish-Speaking Detective (uncredited)

Byron Foulger as Freddie (uncredited)

Kay Garrett as Doctor (uncredited)

Tim Graham as Uniformed Sergeant (uncredited)

Kit Guard as Suspect (uncredited)

Harry Harvey as Liquor Store Proprietor (uncredited)

Thomas Browne Henry as Dunning (uncredited)

Peter Hobbes as Milkman (uncredited)

Virginia Hunter as Miss Smith (uncredited)

Felice Ingersoll as Records Clerk (uncredited)

Anthony Jochim as Liquor Store Proprietor (uncredited)

Stan Johnson as Artist (uncredited)

Louise Kane as Mrs. Rawlins (uncredited)

Tommy Kelly as Redhead (uncredited)

Donald Kerr as Mailman (uncredited)

Charles Lang as Policeman (uncredited)

Lyle Latell as Police Sergeant (uncredited)

Rory Mallinson as Detective with Harry (uncredited)

Billy Mauch as Handsome (uncredited)

John McGuire as Officer Robert Rawlins (uncredited)

Charles Meredith as Hollywood Police Official (uncredited)

Carlotta Monti as Miss Montavio (uncredited)

Bert Moorhouse as Detective (uncredited)

Howard Negley as Lt. Greeson (uncredited)

James Nolan as Harry (uncredited)

John Parrish as Liquor Store Proprietor (uncredited)

Steve Pendleton as Detective (uncredited)

John Perri as Young Hoodlum (uncredited)

Paul Scardon as Liquor Store Proprietor (uncredited)

Kenneth Tobey as Detective Questioning Pete (uncredited)

Wally Vernon as Postman (uncredited)

Harlan Warde as Police Operator 27 (uncredited)

Mary Ware as Reeves' Secretary (uncredited)

Robert B. Williams as Detective (uncredited)

Harry Wilson as Prison Inmate (uncredited)