Robert Clarke

as Major William Allison

Darlene Tompkins

as Princess Trirene

Vladimir Sokoloff

as The Supreme

Boyd 'Red' Morgan

as Captain

Stephen Bekassy

as Gen. Karl Kruse

John van Dreelen

as Dr. Bourman

Arianne Ulmer

as Capt. Markova

Ken Knox

as Col. Marty Martin

Neil Fletcher

as Air Force Chief

Jack Herman

as Dr. Richman

William Shephard

as Gen. York

James 'Ike' Altgens

as Secretary Lloyd Patterson

John Loughney

as Gen. Lamont

Russ Marker

as Col. Curtis

Tom Ravick

as Mutant

Don Flournoy

as Mutant

Arthur C. Pierce

as Mutant Escaping from Jail (uncredited)

Malcolm Thompson

as Guard (uncredited)