L'invincibile Superman

Giovanni Cianfriglia

— Superargo

Guy Madison

— Prof. Wendland Wond

Luisa Baratto

— Claire Brand

Diana Lorys

— Gloria Devon

Aldo Sambrell

— Kamir / Pao-Ki

Tomás Blanco

— Davies

Sergio Testori

— Jo Brand

Valerio Tordi

— Professor Presenski

Aldo Bufi Landi

— J.G. Stafford

Valentino Macchi

— Bank Guard

Frank von Kuegelgen

— Medical Examiner (voice)

Mauro Mannatrizio

— Henchman in Cave

Emilio Messina

— Wrestler vs Jo Brand

Roberto Messina

— Wrestler vs Superargo