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

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

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

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

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

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

A dying telephone lineman's fantastic story leads Vincent to investigate a huge industrial complex o...

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

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

While investigating the theft of a mysterious cylinder from the site of a plane crash, Vincent is ca...

The aliens take David Vincent up into their spaceship and then attempt to prove they have nothing bu...

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

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

Vincent is contacted by a meterologist to help investigate the suspicious nature of a hurricane alon...

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

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

David's brother, who also thinks he is crazy, is kidnapped by the aliens who intend to destroy the o...

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

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

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

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

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

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 d...

Vincent is horrified to learn the invaders are using strange seed spores that after cultivated will...

While investigating the Invaders susceptibility to minor human ailments, Vincent unknowingly is take...

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

In the conclusion of a two-part episode, Vincent must defuse an experimental rocket that if ignited...

David exposes an alien disguised as a prophet who capitalizes on his ability to glow red as a tool...

When David Vincent brings an injured alien into the doctor for treatment, the patient's x-rays revea...

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

David Vincent is kidnapped in a sneak attack on his new found alien-fighting allies, and he must try...

David Vincent and Bob Torin capture an alien leader, whom they hope to show to the authorities as pr...

David Vincent is called in to aid a huge magazine publishing company that has been experiencing disr...

An old college buddy sends David Vincent an urgent message, without any further details other than t...

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

Julian Reed calls upon David Vincent to help him expose aliens who have infiltrated The Slaten Resea...

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

David Vincent arranges a meeting between the alien leaders and an Air Force General, who secretly pl...

Racist issues arise between David Vincent and the Baxters, a black couple, when David produces evide...

In a small New Mexico town, a provincial teenage girl witnesses an alien’s incineration and believes...

A pair of aliens who want to return to their home planet and make a political argument against the i...

The aliens’ experiments with artificial human emotions go awry when one of their subjects, prone to...

David Vincent and Edgar Scoville attempt to warn a senator that a governmental official is an alien,...