An architect's close encounter with a spaceship leads him to investigate a small town's hydroelectric plant.

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

In a border town, David Vincent meets a stripper who claims to have seen something strange in the desert.

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.

David Vincent, using an assumed name, gets a job as a chauffeur in order to infiltrate a manufacturing plant and find proof of alien activity.

David Vincent visits a small Kansas town, resentful of strangers, and uncovers an alien plot to control locusts and other insects.

The aliens plan to explode an anti-matter bomb in Utah during a nuclear test.

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 touch proves lethal: he has developed an alien illness that promises a slow death for him, but a very rapid death by freezing for any organism that he touches! David tracks him down, but others are also very interested in finding Baxter - his own people. Baxter just wants to reach a saucer so he can get medical help, but he is convinced those hunting him simply want him dead. David's success may depend on convincing an old curmudgeon who has turned his back on humanity to find in himself the desire to help others.

David is drawn into the space program by a series of coincidences that convince him of alien involvement. But why do the aliens want to put one of their own on a manned mission? Surely they can get to space whenever they need to. The answer may lie in the meaning of some photographs taken by an unmanned probe. Photographs that reveal some disturbingly regular objects on the moon's surface.

Bill and his new bride are so happy to be married, their antics cause Bill to lose control of the car. They run a truck off the road, and its driver staggers from the vehicle, falls, glows red and vanishes! Then the young couple suffocates - outside! It's all part of a scheme run by the alien Taugus, and it draws in David's brother Bob, Bob's wife Grace, and crusading newsman Theodore Booth. David has finally managed to convince both his brother and someone able to get the word out that he may be telling the truth about the alien invasion - but is it just in time to ...

Pressed for cash, Morgan Tate leased a large portion of his plant to Lewis Dunn a year earlier. Now, Tate has discovered that Dunn is not what he appears to be, and that the plant is now a front for a communications center. Tate has managed to seize and hide a file named "Command Roster One" and the aliens are desperate to recover it. They bring in Tate's estranged daughter Carol to pressure the man, but with David Vincent's help, Tate may manage to save his daughter and recover the hidden file. If he can, it would be a terrible setback for the invaders.