George Segal
Harry Calder
Richard Widmark
Agent Hoyt
Timothy Bottoms
Young Man
Harry Guardino
Keefer
Susan Strasberg
Fran
Henry Fonda
Simon Davenport
Helen Hunt
Tracy Calder
Dorothy Tristan
Helen
Harry Davis
Benny Neilson
Stephen Pearlman
Bert Lyons
G.F. Rowe
Wayne Moore
Wayne Tippit
Police Captain Christie
Michael Bell
Demerest
Robert Quarry
Mayor
Richard Altman
Mandell
Gloria Calomee
Jackie
Quinn K. Redeker
Owner #2
Craig Wasson
Hippie Boy
Jean Rasey
Girl in Line
Greg Elliot
Boy in Line
Tara Buckman
Coaster Attendant
Monica Lewis
Tourist Mother
Dick Wesson
Tourist Father
Bruce Kimball
Bomb Squad #1
Bruce French
Bomb Squad #2
Stephen Mendillo
Bomb Squad #3
Larry Holt
Bomb Squad #4
Gene Tyburn
Bomb Squad #5
Arthur Peterson
Owner
Mark Thomas
Agent with Red Hat
Ron Mael
Self - Sparks (uncredited)
Russell Mael
Self - Sparks (uncredited)
Steve Guttenberg
Messenger (uncredited)
Bill Sorrells
Selby
William Prince
Quinlan