Bela Lugosi

Boroff

Ralph Byrd

Lt. Terry Kent

Maxine Doyle

Jean Norman

Richard Alexander

Thorg

Herbert Rawlinson

Cmdr. Boyle

John Picorri

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

Thomas Carr

Ens. Jim Kent [Ch. 1]

Lawrence Grant

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

Carleton Young

Henchman Dodds [Ch. 4]

George Chesebro

L.H. Degado - Chief Thug [Ch. 5]