Mike Kennedy
Hubert

Ely Galleani
Joan Hammond

George Rigaud
Dr. Kerr
Ezio Marano
Lowell - Scientific Squad

Franco Balducci
McKenna

Luigi Antonio Guerra
Policeman

Erzsi Paál
Mrs. Gordon
Gaetano Imbró
Policeman

Leo Genn
Edmond Brighton

Anita Strindberg
Julia Durer (uncredited)