Harry Bailey
Elliott Gould
Jan
Candice Bergen
Luan
Brenda Sykes
Garcia
Gregory Sierra
College girl
Julia Anne Robinson
Herbert
John Rubinstein
Dr. Bill Greengrass
Richard Anders
Sheila
Jenny Sullivan
Landlady
Billie Bird
Jake
Harrison Ford
Alice Linden
Elizabeth Lane
Cynthia
Hilarie Thompson
Nick
Robert F. Lyons
Mrs. Stebbins
Irene Tedrow
Roommate
Joanna Serpe
Airline Representative
Scott Perry
TV News Reporter (uncredited)
Ray Carnay
Dean Chesney (uncredited)
Harry Holcombe
Student (uncredited)
Dr. Kasper
Cecil Kellaway
Dr. Edward Willhunt
Jeff Corey
Ellis
Max Julien
Vandenburg
Jon Lormer
Lysander
Leonard Stone
Wade Linden
William Bramley
Judy Kramer
Jeannie Berlin
Stunts
Eddy Donno
Assistant Director
Hawk Koch
Director of Photography
László Kovács
Director
Richard Rush
Producer
Editor
Maury Winetrobe
Music
Ronald Stein
Writer
Robert Kaufman
Novel
Ken Kolb
Set Decoration
Edward M. Parker
Second Assistant Director
Charles Norton
Makeup Supervisor
Ben Lane
Leo Lotito Jr.
Sound
Chic Borland
Arthur Piantadosi
Les Fresholtz
Mike Dilley
Special Effects
Ira Anderson Jr.
Stunt Coordinator
Charles Bail
Art Direction
Sydney Z. Litwack
Hairstylist
Virginia Jones