Robert Douglas

as Dr. Michaels

as Sir Alex Gordon (uncredited)

as Uncle Morton Stearnes

as Agamemnon

as John Porter

as Gen. Benedict Arnold

as Sir Christopher Hatton

as Sir Giles Amaury

as Benton

as General

as Saint Ebenezer / Pulo Besar

as Michael, Duke of Strelsau

as Sir Hugh De Bracy

as Dr. Edward Jeffreys

as Colonel Creighton

as Marchese Alessandro de Granazia

as Philip Cagle

as Stephen Paradou

as Alexander Narbonne

as Narrator (voice) (uncredited)

as Elsworth Toohey

as Lt. Michael Landers

as Duque de Lorca

as Briefing Officer