Roger Browne as Martin Stevens / Superseven

Fabienne Dali as Denise

Massimo Serato as Alex

Andrea Aureli as Il Levantino (as Andrew Ray)

Dina De Santis as Tania

Antonio Gradoli as Yussef (as Anthony Gradwell)

Stella Monclar as Nietta

Mino Doro as Il Professore

Franco Castellani as L'Ispettore Stugel

Claudio Biava as Hans

Wilbert Bradley as

Emilio Messina as Nickols

Sandro Pellegrini as

Francesco De Leone as Professor Gabin

Gaetano Quartararo as

Nando Angelini as Tecnico della Radioattività

Piera Clerici as

Enzo Maggio as

Domenico Calderucci as

Rosalba Neri as Faddja

Artemio Antonini as Levantino's henchman

Paolo Bonacelli as Capitano Hume

Thea Fleming as Martin's Blonde Lover