![]() | A runaway asteroid dubbed "The Outsider" mysteriously begins orbiting the Earth and threatens it with lethal flying saucers. |
| Claude Rains | - | Prof. Benson |
| Bill Carter | - | Cmdr. Bob Cole |
| Umberto Orsini | - | Dr. Fred Steele |
| Maya Brent | - | Eve Barnett |
| Jacqueline Derval | - | Cathy Cole |
| Renzo Palmer | - | Barrington |
| Carlo D'Angelo | - | Gen. Varreck |
| Carol Danell | - | Mrs. Collins |