John Phillip Law (Diabolik), Marisa Mell (Eva Kant), Michel Piccoli (Inspector Ginko), Adolfo Celi (Ralph Valmont), Terry-Thomas (Finanzminister), Claudio Gora (Polizeichef), Caterina Boratto (Lady Clark), Giulio Donnini (Dr. Vernier), Mario Donen (Sergeant Danek), Renzo Palmer (Mr. Hammond), Lucia Modugno (Prostitute), Annie Gorassini (Rose), Lucky Moore (Lorry Driver), Carlo Croccolo (Lorry Driver), Lidia Biondi (Policewoman), Andrea Bosic (Bank Manager), Federico Boido (Valmont's Henchman), Tiberio Mitri (Valmont's Henchman), Isarco Ravaioli (Valmont's Henchman), Giorgio Sciolette (Dr. Ferrara)