From distant Umbriel, second moon of Uranus, comes a strange looking spaceship. Under cover of darkness, it lands near Glenn City, discharging an army of Shadowmen. The invaders from Umbriel quickly begin recruiting residents from Glenn City for their army, using a doorway that forcibly converts Earthmen into Shadowmen.
| Name | Type | Role | |
|---|---|---|---|
| Alan Riefe | Writer | ||
| Peter Fernandez | Writer | ||
| Sid Jacobson | Writer |