Dr. Harry Wolper
Peter O'Toole
Meli
Mariel Hemingway
Mr. Spencer
Rance Howard
Mrs. Spencer
Ellen Geer
Prof. Brauer
Ian Wolfe
Boom-Boom
Mike Jolly
Lyman
Burton Collins
Karen
Judith Hansen
Arthur
Doug Cox
Norman
Anthony Peck
Fred
Crawford Binion
Krauss
Byrne Piven
Boris Lafkin
Vincent Spano
Hamberg
Vincent Cobb
Bovi
Gary Bayer
Dr. Whitaker
Jordan Charney
Dr. Sutter
William Bassett
Dr. Franklin
Sandy Ignon
Dean Harrington
Jeff Corey
Larry
Michael McGrady
Woman with Monkey
Eve McVeagh
Guard
Al Fann
Michael Greene
Barbara Spencer
Virginia Madsen
Martin Goodwin (uncredited)
James Murray
Dr. Sid Kullenbeck
David Ogden Stiers
Paul
John Dehner
Lucy Wolper
Karen Kopins
Pavlo
Kenneth Tigar
Mrs. Mallory
Elsa Raven
Mrs. Pruitt
Lee Kessler
Costume Design
Julie Weiss
Novel
Jeremy Leven
Screenplay
Casting
Lynn Stalmaster
Director
Ivan Passer
Associate Producer
Charles Mulvehill
Producer
Stephen J. Friedman
Art Direction
Josan F. Russo
Music
Sylvester Levay
Director of Photography
Robbie Greenberg
Editor
Richard Chew