A giant asteroid is heading toward Earth so some astronauts disembark from a nearby space station to blow it up. The mission is successful, and they return to the station unknowingly bringing back a gooey green substance that mutates into one-eyed tentacled monsters that feed off electricity. Soon the station is crawling with them, and people are being zapped left and right!
| Actor | Role |
|---|---|
 Robert HortonCommander Jack Rankin | Commander Jack Rankin |
 Luciana PaluzziDr. Lisa Benson | Dr. Lisa Benson |
 Richard JaeckelCommander Vince Elliott | Commander Vince Elliott |
| BBud WidomGeneral Jonathan B. Thompson | General Jonathan B. Thompson |
| TTed GuntherDr. Hans Halvorsen | Dr. Hans Halvorsen |
| DDavid YorstonLt. Curtis | Lt. Curtis |
 Robert DunhamCapt. Martin | Capt. Martin |
| GGary RandolfCordier | Cordier |
| JJack MorriseyLt. Morris, Rocket Pilot | Lt. Morris, Rocket Pilot |
| EEugene VinceTechnician | Technician |
| DDon PlanteTechnician | Technician |
| LLinda HardistyNurse | Nurse |
| RRichard HyllandMichaels | Michaels |
 Kathy HoranNurse | Nurse |
| AAnn AultNurse | Nurse |
| SSusan SkersickNurse | Nurse |
| HHelen KirkpatrickNurse | Nurse |
| KKarl BengsRocket Pilot | Rocket Pilot |
 Linda MillerNurse | Nurse |
| SStrong IlimaitiDoctor | Doctor |
| EEnver AltenbayTechnician | Technician |
| TTom ScottLt. Scott, Rocket Pilot | Lt. Scott, Rocket Pilot |
 Patricia ElliottNurse | Nurse |