An alien vessel manages to break the earth defense systems. Captain Layton is sent to investigate and find the invaders. Together with friends from the planet Ganymed he discovers the enemies in a hidden underground city on earth.
John Richardson
as Captain Mike Layton
Yanti Somer
as Diane Greene
Walter Maestosi
as Irk
Gaetano Balestrieri
as Colonel Dawson
Gisela Hahn
as Dr. Helen Parker
Aldo Canti
as Frank Bimble
Massimo Bonetti
as Lt. Vassilov
West Buchanan
as Captain Connolly
Lucio Rosato
as Professor Burton
Malisa Longo
as Replicant
Giuseppe Fortis
as Herman Wesson
Omero Capanna
as
