David Vincent pulls his car over to take a nap late one night only to be awoken by a spaceship landing nearby. However, he struggles to convince anyone of his story.

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

Vincent travels to the site of a US Air Force investigation into a reported UFO landing, where he meets a reporter and a stripper who claim to have vital information.

David Vincent meets with the president of an electronics company, a man who believes aliens have kidnapped various heads of their fields and are planning to kidnap him as well.

David Vincent discovers the aliens have taken over a sea lab for sinister purposes.

When a 'man' is spotted glowing in a transparent tube, the story makes the papers leading Vincent to discover a corporation has made a deal with the Invaders. Vincent, using an assumed name, gets a job as a chauffeur in order to infiltrate the manufacturing plant and find proof of alien activity.

When a schoolteacher discovers an usual device she is inexplicably attacked by locusts, and when Vincent investigates he encounters unusual resistance in a small town.

Vincent is summoned to an army base where he uncovers a conspiracy concerning an Invader plot to hijack a nuclear weapon test and kill millions of innocents.

A strange, metallic cylinder is stored at a laboratory, waiting to be tested. It belongs to the aliens, and they are willing to kill in order to get it back.

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.

A school in New Mexico is really a front for an alien indoctrination center. The head of the school offers a pilot a lot of money to smuggle in its otherworldly students.

David Vincent steals a computer tape in order to expose alien activity on Houston oil fields.

A mysterious hurricane strikes, sparing only a small Florida town. That draws David's attention, and he soon discovers a nest of aliens there, determined to use the weather against humanity. Their boat creates and controls the storm, but what controls the boat? David must find that control center before the aliens use their storm to wreck the entire eastern seaboard. He's hampered by an injury, and a clever alien who turns his benefactor Father Corelli against him.

Nick Baxter's an invader, and his touch proves lethal: he's developed an illness which promises a slow death for him, but a very rapid death by freezing for any organism he touches. David tracks him down, but others of his kind are also interested in finding him. Baxter wants to reach a ship so he can get medical help, but he's convinced those hunting him want him dead. David's success depends on convincing someone who's turned his back on humanity, to find in himself the desire to help others.