Vincent battles, then destroys an alien guard and captures one of their spacecraft.

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

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

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

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

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.

David Vincent joins forces with the mob when the aliens inadvertently take their illegal shipment of drugs.

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.

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

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

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

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

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

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

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

David Vincent is kidnapped in a sneak attack on his new found alien-fighting allies, and he must try to escape an alien installation with a human psychologist.

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

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

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

A pair of aliens who want to return to their home planet and make a political argument against the invasion of Earth ask David Vincent to help them elude an intensive police manhunt.

David deceives the aliens that he is willing to work with them for a fee, all the while with a plan of attack in mind.

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?

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

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

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

After an alien is captured in a small town, Vincent warns the townspeople, who assume their captive is a madman.