A stray planet on a collision course with Earth instead takes orbit around our blue marble. What seems like a dead planet suddenly launches a fleet of flying saucers which attack our space fleets.
| Actor | Role |
|---|---|
 Claude RainsProfessor Benson | Professor Benson |
 Bill CarterCmdr. Robert Cole | Cmdr. Robert Cole |
| MMaya BrentEve Barnett | Eve Barnett |
 Umberto OrsiniDr. Fred Steele | Dr. Fred Steele |
| JJacqueline DervalMrs. Collins | Mrs. Collins |
| CCarol DanellCathy Cole | Cathy Cole |
 John StacyDr. Cornfield | Dr. Cornfield |
| JJim DolenBoyd | Boyd |
| CCarlo D'AngeloGeneral Varreck | General Varreck |
 Massimo RighiLewis Boyd | Lewis Boyd |
| JJoe PolliniPat | Pat |
 John KarlsenSupervising Commissioner | Supervising Commissioner |
 Renzo PalmerBarrington | Barrington |
| AAldo D'AmbrosioUnited Commission Member | United Commission Member |
 Giuliano GemmaMoran | Moran |