Vincent discovers that a school is being used by the aliens as an indoctrination center.

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

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.

Vincent discovers a mysterious computer tape that could offer proof of the alien invasion.

David Vincent meets with an eminent astrophysicist who has proof that aliens are invading the planet.

Vincent's search for aliens lead him to an underwater sea lab.

Vincent travels to a small town to check a possible link between the aliens and an attack of carnivorous insects.

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

The invaders frame Vincent for the death of an owner of an electronics plant who had made discoveries about the aliens.

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

Vincent is called upon to help avert possible alien infiltration at a government nuclear test site.

The invaders and Vincent race to capture a wounded alien whose touch brings on freezing death.

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.

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.

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?

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

David Vincent and Edgar Scoville attempt to warn a senator that a governmental official is an alien, while Andy Hatcher tries to prove otherwise.

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.

David's brother, who also thinks he is crazy, is kidnapped by the aliens who intend to destroy the oxygen in our planet's air.

A hysterical hotel manager tells Vincent aliens are taking over his hotel.

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

A man seek's Vincent's aid after he is arrested and put on trial for murder after the incineration death of an alien.

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

In Part I of this two-part episode, Vincent uncovers a diabolical alien plot to destroy all of the world's leaders.