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)