An architect's close encounter with a spaceship leads him to investigate a small town's hydroelectric plant.

With the assistance of Vicki, a nightclub stripper, Vincent continues his search for an alien spacecraft.

Vincent is called on by a renowned electronics expert who fears he may soon be abducted by alien invaders.

A dying telephone lineman's fantastic story leads Vincent to investigate a huge industrial complex owned by a famous war hero.

While investigating the theft of a mysterious cylinder from the site of a plane crash, Vincent is captured and suspected of being an alien.

The aliens take David Vincent up into their spaceship and then attempt to prove they have nothing but peaceful intentions by showing him what they've done to a desert valley. But all is not what it seems.

Vincent is contacted by a meterologist to help investigate the suspicious nature of a hurricane along the Eastern U.S. coast.

Vincent helps a security official investigate the deaths of two lunar astronauts in a strange red fog.

Vincent attempts to thwart the alien infiltration of a Air Defense Command Unit.

Despite Vincent's warnings, a nurse tries to help an injured alien survivor of a saucer crash.

Vincent is horrified to learn the invaders are using strange seed spores that after cultivated will develop into full-grown aliens.

While investigating the Invaders susceptibility to minor human ailments, Vincent unknowingly is taken aboard an alien spacecraft.

In the conclusion of a two-part episode, Vincent must defuse an experimental rocket that if ignited will destroy all heads of state gathered at a world summit meeting.

David exposes an alien disguised as a prophet who capitalizes on his ability to glow red as a tool to deceive people into thinking that his ""gift"" is from God.

A Russian ambassador summons David Vincent after he finds that a burglar caught inside the embassy is an alien.

David Vincent and Bob Torin capture an alien leader, whom they hope to show to the authorities as proof; however, the leader's alien comrades foil David's efforts.

An old college buddy sends David Vincent an urgent message, without any further details other than that it is important. When David arrives, Ted has been brain washed so that he can no longer remember why in the world he'd wanted to see his friend. It soon becomes obvious that the aliens are using mind control of some sort.

Julian Reed calls upon David Vincent to help him expose aliens who have infiltrated The Slaten Research Center. By the time David arrives at the scene, Julian's having hallucinations. Is Julian truly a lunatic, or are the aliens behind his mental lapse?

David Vincent arranges a meeting between the alien leaders and an Air Force General, who secretly plans to drop a bomb on the alien leaders despite the fact that many innocent people will die in the process.

In a small New Mexico town, a provincial teenage girl witnesses an alien’s incineration and believes it to be a sign from God.

The aliens’ experiments with artificial human emotions go awry when one of their subjects, prone to homicidal rages, defects to David Vincent’s side.