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David Vincent and Edgar Scoville attempt to warn a senator that a governmental official is an alien, while Andy Hatcher tries to prove otherwise.
Suzanne Pleshette is an alien who was being used to test Human emotion, but she now has dangerous and deadly mood swings.
David does all he can to get these two peaceful aliens back to their ship as they want to convince their leaders not to attack Earth.
A teenage girl sees an alien dying from a snake bite and then realizes how much her life has changed when the alien leaves her a bag containing a crystal.
Racist issues arise between David Vincent and the Baxters, a black couple, when David produces evidence that another African American in line for an important position with the space program is actually an alien.
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.
David Vincent joins forces with the mob when the aliens inadvertently take their illegal shipment of drugs.
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 deceives the aliens that he is willing to work with them for a fee, all the while with a plan of attack in mind.
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.
David Vincent is called in to aid a huge magazine publishing company that has been experiencing disruptive behavior in its company heads, and David believes that the aliens are behind the troubles.
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.
A group of seven people get together to fight the Invaders. They are headed by Edgar Scoville.
An alien is taken captive while breaking into a safe in a Soviet Embassy.
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 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.
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.
In Part I of this two-part episode, Vincent uncovers a diabolical alien plot to destroy all of the world's leaders.
While investigating the Invaders susceptibility to minor human ailments, Vincent unknowingly is taken aboard an alien spacecraft.
Vincent is horrified to learn the invaders are using strange seed spores that after cultivated will develop into full-grown aliens.
A man seek's Vincent's aid after he is arrested and put on trial for murder after the incineration death of an alien.
Despite Vincent's warnings, a nurse tries to help an injured alien survivor of a saucer crash.
After an alien is captured in a small town, Vincent warns the townspeople, who assume their captive is a madman.
A hysterical hotel manager tells Vincent aliens are taking over his hotel.
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.