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

Rance Howard

Mr. Spencer

Ellen Geer

Mrs. Spencer

Ian Wolfe

Prof. Brauer

Doug Cox

Arthur

Anthony Peck

Norman

Byrne Piven

Krauss

Jordan Charney

Dr. Whitaker

William Bassett

Dr. Sutter

Jeff Corey

Dean Harrington

Michael McGrady

Larry

Eve McVeagh

Woman with Monkey

Michael Greene

Guard

James Murray

Martin Goodwin (uncredited)