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

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

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.

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

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

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.

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.

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

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.

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

The aliens take David Vincent up into their spaceship and then attempt to prove they have nothing but peaceful intentions by showing him what they've done to a desert valley. But all is not what it seems.

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.

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.

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

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 owned by a famous war hero.

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

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.

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

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

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?