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)