John Vernon
— David Hunter / Praetorius
Steve Ihnat
— Alain Praetorius
Sabrina Scharf
— Anne Novak
Edward Binns
— Owen Larkdale
Fritz Weaver
— Cirrak
Ramon Bieri
— Mishani
John Schuck
— McDaniel
Barbara Rhoades
— Real Estate Woman
Roger Bowen
— Alfred Blount
Woodrow Parfrey
— Tyson
Lonny Chapman
— Albert Treadway
Ed Flanders
— Dr. Miles
Sheldon Allman
— Dr. Abrams
J. David Jones
— Lubbock
Tony Van Bridge
— Griggs
Lawrence Cook
— Donnelly
Walter Stocker
— Gunner
Jerry Douglas
— Gen. Rollins
Peggy Rea
— Helen Shaw's Friend
Bill Erwin
— Sam Pickering
Nicky Blair
— Mr. Wilson
Marcy Lafferty
— Scientist Wearing Gas Mask
Jason Wingreen
— Mr. Lubbock
Paul Comi
— Wilson (uncredited)