Peter O'Toole
Dr. Harry Wolper
Mariel Hemingway
Meli
Vincent Spano
Boris Lafkin
Virginia Madsen
Barbara Spencer
David Ogden Stiers
Dr. Sid Kullenbeck
John Dehner
Paul
Karen Kopins
Lucy Wolper
Kenneth Tigar
Pavlo
Elsa Raven
Mrs. Mallory
Lee Kessler
Mrs. Pruitt
Rance Howard
Mr. Spencer
Ellen Geer
Mrs. Spencer
Ian Wolfe
Prof. Brauer
Mike Jolly
Boom-Boom
Burton Collins
Lyman
Judith Hansen
Karen
Doug Cox
Arthur
Anthony Peck
Norman
Crawford Binion
Fred
Byrne Piven
Krauss
Vincent Cobb
Hamberg
Gary Bayer
Bovi
Jordan Charney
Dr. Whitaker
William Bassett
Dr. Sutter
Sandy Ignon
Dr. Franklin
Jeff Corey
Dean Harrington
Michael McGrady
Larry
Eve McVeagh
Woman with Monkey
Al Fann
Guard
Michael Greene
Guard
James Murray
Martin Goodwin (uncredited)