James Brown

Col. Hank Stevens

Francine York

Dr. Lisa Wayne

Baynes Barron

Dr. John Andros

Russ Bender

Dr. Paul Martin

John Willis

TV Reporter

Bob Legionaire

Faith I Crewman

James Macklin

Gen. Mark Tilman (as Jim Maclin)

Phyllis Selznick

Earth Control Secretary

John Lomma

Earth Control (as John Loma)