An architect's close encounter with a spaceship leads him to investigate a small town's hydroelectric plant. This episode contains deleted and extended length scenes never broadcast on television.

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

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

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

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

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

When David Vincent brings an injured alien into the doctor for treatment, the patient's x-rays reveal odd results. While David works to alert the authorities, the aliens conspire to destroy both evidence and witnesses.

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