Richard Basehart
Roy Martin / Roy Morgan

Scott Brady
Police Sgt. Marty Brennan

Roy Roberts
Police Captain Breen

Whit Bissell
Paul Reeves

James Cardwell
Police Sgt. Chuck Jones

Jack Webb
Lee Whitey

Reed Hadley
Narrator (voice) (uncredited)

Frank Cady
Pete Hammond

Dorothy Adams
Milk Customer

Jane Adams
Nurse Scanion (uncredited)

Jack Bailey
Witness in Pajamas and Robe (uncredited)

Robert Bice
Detective with Capt. Breen (uncredited)

Garrett Craig
Patrolman (uncredited)

John Dehner
Assistant Bureau Chief (uncredited)

Ann Doran
Dispatcher (uncredited)

Rex Downing
Young Hoodlum (uncredited)

Paul Fierro
Spanish-Speaking Detective (uncredited)

Byron Foulger
Freddie (uncredited)

Kit Guard
Suspect (uncredited)

Harry Harvey
Liquor Store Proprietor (uncredited)

Thomas Browne Henry
Dunning (uncredited)

Virginia Hunter
Miss Smith (uncredited)

Anthony Jochim
Liquor Store Proprietor (uncredited)

Tommy Kelly
Redhead (uncredited)

Donald Kerr
Mailman (uncredited)

Charles Lang
Policeman (uncredited)

Lyle Latell
Police Sergeant (uncredited)

Rory Mallinson
Detective with Harry (uncredited)

Billy Mauch
Handsome (uncredited)

John McGuire
Officer Robert Rawlins (uncredited)

Charles Meredith
Hollywood Police Official (uncredited)

Carlotta Monti
Miss Montavio (uncredited)

Howard Negley
Lt. Greeson (uncredited)

James Nolan
Harry (uncredited)

John Parrish
Liquor Store Proprietor (uncredited)

Steve Pendleton
Detective (uncredited)

Paul Scardon
Liquor Store Proprietor (uncredited)

Kenneth Tobey
Detective Questioning Pete (uncredited)

Wally Vernon
Postman (uncredited)

Harlan Warde
Police Operator 27 (uncredited)

Mary Ware
Reeves' Secretary (uncredited)

Robert B. Williams
Detective (uncredited)

Harry Wilson
Prison Inmate (uncredited)