A misguided scientist enables an alien from Venus named Zontar to come to earth in order to "help solve man's problems". However, as soon as Zontar arrives on Earth, it quickly becomes obvious that the three-eyed, bat-winged, skeletal black creature has a hidden agenda.
| Actor | Role |
|---|---|
 John AgarDr. Curt Taylor | Dr. Curt Taylor |
 Susan BjurmanMartha Ritchie | Martha Ritchie |
 Tony HustonKeith Ritchie | Keith Ritchie |
 Pat DelaneyAnne Taylor | Anne Taylor |
 Neil FletcherGeneral Matt Young | General Matt Young |
 Warren HammackJohn, Rocket Scientist at Zone 6 | John, Rocket Scientist at Zone 6 |
 Colleen CarrLouise, Zone 6 | Louise, Zone 6 |
 Jeff AlexanderRocket Scientist at Zone 6 | Rocket Scientist at Zone 6 |
 Bill ThurmanSheriff Brad Crenshaw | Sheriff Brad Crenshaw |
| AAndrew TraisterSgt. Magalar | Sgt. Magalar |
| JJonathan LedfordZone 6 Gate Guard | Zone 6 Gate Guard |
 George EdgleyMr. Ledford, Newspaper Editor | Mr. Ledford, Newspaper Editor |
| CCarol GilleyAlice, Zone 6 Clerk | Alice, Zone 6 Clerk |
| BBertha HolmesTownswoman | Townswoman |