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

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

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 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.

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

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

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.