L'umanoide

Richard Kiel

Golob

Corinne Cléry

Barbara Gibson

Barbara Bach

Lady Agatha

Leonard Mann

Nick

Arthur Kennedy

Dr. Kraspin

Ivan Rassimov

Lord Graal

Massimo Serato

Great Brother

Marco Yeh

Tom Tom

Venantino Venantini

Vito Fornari

José Quaglio

Attilio Duse

Ottaviano Dell'Acqua

Technician

Larry Dolgin

Narrator (voice)

Hal Yamanouchi

Humanoid Soldier

Milla Johansson

Girl who is drained of blood (uncredited)