Paul Douglas as Police Ofcr. Charlie Dunnigan

Richard Basehart as Robert Cosick

Barbara Bel Geddes as Virginia Foster

Debra Paget as Ruth

Agnes Moorehead as Christine Hill Cosick

Robert Keith as Paul E. Cosick

Howard Da Silva as Deputy Police Chief Moskar

Jeffrey Hunter as Danny Klempner

Martin Gabel as Dr. Strauss

Grace Kelly as Mrs. Louise Ann Fuller

Frank Faylen as Walter, room service waiter

Jeff Corey as Police Sgt. Farley

James Millican as Police Sgt. Boyle

Donald Randolph as Dr. Benson

Richard Beymer as (uncredited)

Ossie Davis as Cab Driver (uncredited)

Brad Dexter as Reporter (uncredited)

Leif Erickson as Bit Part (uncredited)

Sandra Gould as Hotel Switchboard Operator (uncredited)

Russell Hicks as Regan, Hotel Manager (uncredited)

Brian Keith as Extra (uncredited)

Harvey Lembeck as Cab Driver (uncredited)

John Randolph as Fireman (uncredited)

Janice Rule as Bit Part (uncredited)

Joyce Van Patten as Barbara (uncredited)

Willard Waterman as Mr. Harris (uncredited)

John Cassavetes as Reporter (uncredited)

Rusty Lane as Cop (uncredited)

Alix Talton as Miss Kelly (uncredited)