Carroll Baker
Sylvia: West (Karoki, Kay, Carlyle)
George Maharis
Alan Macklin
Joanne Dru
Jane (Bronson) Phillips
Peter Lawford
Frederic Summers
Viveca Lindfors
Irma Olanski
Edmond O'Brien
Oscar Stewart
Aldo Ray
Jonas Karoki
Ann Sothern
Mrs. Argona / Grace Argona
Lloyd Bochner
Bruce Stamford III
Paul Gilbert
Lola Diamond
Jay Novello
Father Gonzales
Nancy Kovack
Big Shirley
Gene Lyons
Gavin Cullen
Anthony Caruso
Wilbur (aka "Muscles")
Alan Carney
Gus
Shirley O'Hara
Mrs. Karoki
Ricky Allen
Herbert, the Boy in the Library (uncredited)
Val Avery
Pudgey Smith (uncredited)
Majel Barrett
Anne (uncredited)
Jean Del Val
Maitre'd (uncredited)
Connie Gilchrist
Molly Banter (uncredited)
Gavin Gordon
Butler (uncredited)
Clive Halliday
Calligraphy Professor (uncredited)
John Harmon
Sid (uncredited)
Stacy Harris
Mr. Leland (uncredited)
Kathleen Mulqueen
Assistant Principal (uncredited)
Manuel Padilla Jr.
Pancho Guzman (uncredited)
Robert Random
(uncredited)
Gene Roth
Professor Eglebert (uncredited)
Geraldine Wall
Clerk at Private Hospital (uncredited)
Paul Wexler
Peter Memel (uncredited)