Giacomo Rossi Stuart

as Dr. Johns

as Roger

as Count Richard Marnack

as Jimmy

as Anselmi

as Fritz von Merkel

as Riccardo Murri

as Carlo Salvi (as Giacomo Rossi-Stuart)

as Jack Donati

as Tricky

as Dr. von Ravensbrück - Walter's Father

as Marco

as Victor Morgan

as Hawkins, Pinkerton detective

as Giovanni's Brother

as Dr. Richard Timberlane

as Donald Forrest

as Ted Collins

as Schwalberg

as Major Powell

as One of Gutierrez' Officers

as Gert Muller

as Comandante del Lager

as Cmdr. Rod Jackson

as Cmdr. Rod Jackson

as Dr. Paul Eswai

as King Arald

as Ben Cortman

as Sheriff Lance Corbett

as Eurialo

as Ishmael

as Prof. Rodriguez's Assistant

as Stuart (uncredited)

as Rosati