David Hunter / Praetorius
John Vernon
Alain Praetorius
Steve Ihnat
Albert Treadway
Lonny Chapman
Dr. Miles
Ed Flanders
Dr. Abrams
Sheldon Allman
Lubbock
J. David Jones
Griggs
Tony Van Bridge
Donnelly
Lawrence Cook
Gunner
Walter Stocker
Gen. Rollins
Jerry Douglas
Helen Shaw's Friend
Peggy Rea
Sam Pickering
Bill Erwin
Anne Novak
Sabrina Scharf
Mr. Wilson
Nicky Blair
Scientist Wearing Gas Mask
Marcy Lafferty
Mr. Lubbock
Jason Wingreen
Wilson (uncredited)
Paul Comi
Owen Larkdale
Edward Binns
Cirrak
Fritz Weaver
Mishani
Ramon Bieri
McDaniel
John Schuck
Real Estate Woman
Barbara Rhoades
Alfred Blount
Roger Bowen
Tyson
Woodrow Parfrey
Music
Lalo Schifrin
Director
Leonard Horn
Producer
Bruce Geller
Writer
Cliff Gould
Creator
Director of Photography
Jerry A. Sims
Editor
Patrick Kennedy
Melvin Shapiro
Production Design
Allen E. Smith
Stunts
Hubie Kerns Jr.