David Stillwell

Gregory Peck

Shela

Diane Baker

Ted

Walter Matthau

Dr. Augustus J. Broden

Robert H. Harris

Josephson

Kevin McCarthy

Lester

Jack Weston

Major Crawford

Leif Erickson

Frances

Anne Seymour

Charles Stewart Calvin

Walter Abel

Willard

George Kennedy

Bo

House B. Jameson

Lt. Franken

Hari (Harry) Rhodes

Lt. Franken

Hari Rhodes

Benny

Syl Lamont

Irene

Eileen Baral

Joe Turtle

Neil Fitzgerald

Tour Group Leader

Franklin E. Cover

Don Anderson

Jack Warden

Bill Baldwin

Al Beaudine

Roxane Berard

Robert Brubaker

Toni Covington

John Crowther

Robert Dahdah

Tenant in Apartment 3R (uncredited)

Ann Doran

Jerry Dunphy

Douglas Evans

Harry Fleer

Rian Garrick

Gerald Gordon

Bar Patron (uncredited)

Damian O'Flynn

John Pedrini

Office worker (uncredited)

Barbara Perry

Detective (uncredited)

Murray Pollack

Eddie - Bartender (uncredited)

Bill Quinn

Allan Ray

Reporter (uncredited)

Walter Reed

Victor Romito

George Simmons

Ann Staunton

Bert Stevens

Police Sergeant (uncredited)

Robert Swan

Dr. Broden's Receptionist (uncredited)

Aline Towne

Howard Wendell

Bar Patron Discussing Watermelon (voice) (uncredited)

Myron Healey