Lugosi Béla

Boroff

Ralph Byrd

Lt. Terry Kent

Maxine Doyle

Jean Norman

Richard Alexander

Thorg

Lee Ford

Snapper McGee

Herbert Rawlinson

Cmdr. Boyle

John Picorri

G.A. Rackerby [Chs. 2-12]

Allen Connor

Dick Norman

Thomas Carr

Ens. Jim Kent [Ch. 1]

Lawrence Grant

Rabinisi - Boroff's Spokesman at Screening [Ch. 1]