Gregory Peck

David Stillwell

Diane Baker

Shela

Walter Matthau

Ted Caselle

Robert H. Harris

Dr. Broden

Kevin McCarthy

Sylvester Josephson

Leif Erickson

The Major

Walter Abel

Charles Stewart Calvin

George Kennedy

Willard

Jack Weston

Lester

Anne Seymour

Frances Calvin

House Jameson

Bo

Hari Rhodes

Lt. Franken

Syl Lamont

Benny

Eileen Baral

Irene

Neil Fitzgerald

Joe Turtle

Franklin Cover

Group Leader

Don Anderson

Bill Baldwin

Al Beaudine

Roxane Berard

Robert Brubaker

Toni Covington

John Crowther

Robert Dahdah

Ann Doran

Tenant in Apartment 3R (uncredited)

Jerry Dunphy

Douglas Evans

Harry Fleer

Rian Garrick

Gerald Gordon

Damian O'Flynn

Bar Patron (uncredited)

John Pedrini

Barbara Perry

Office worker (uncredited)

Murray Pollack

Detective (uncredited)

Bill Quinn

Eddie - Bartender (uncredited)

Allan Ray

Walter Reed

Reporter (uncredited)

Victor Romito

George Simmons

Ann Staunton

Bert Stevens

Robert Swan

Police Sergeant (uncredited)

Aline Towne

Dr. Broden's Receptionist (uncredited)

Howard Wendell

Myron Healey

Bar Patron Discussing Watermelon (voice) (uncredited)

Ted J. Kent

Editor

Peter Stone

Screenplay

Howard Fast

Novel

Edward Dmytryk

Director

Joseph MacDonald

Director of Photography

Harry Keller

Producer

Buddy Van Horn

Stunts

John McCarthy Jr.

Set Decoration

Jean Louis

Costume Design

John P. Austin

Set Decoration

Alexander Golitzen

Art Direction

Frank Arrigo

Art Direction

Quincy Jones

Original Music Composer

Larry Germain

Hairstylist

Bud Westmore

Makeup Artist