Robert Culp
— Narrator
David Carradine
— John Tucker (archive footage) (uncredited)
Dan Haggerty
— Dr. Mike Campbell (archive footage) (uncredited)
Persis Khambatta
— Colbalt (archive footage) (uncredited)
Cameron Mitchell
— Dutch / Miller (archive footage) (uncredited)
Oliver Reed
— General Turner (archive footage) (uncredited)