Dimension X - Dwellers in Silence

A test pilot on an experimental high altitude aircraft with only ten minutes worth of fuel disappears from radar for ten hours, yet returns safely. Of course, it is impossible, as is his story of contact with aliens and the dire warning they have for Mankind.

To escape a world of radioactive dust and intense gamma radiation, the survivors of the 3rd Atomic War burrowed underground and, over the next 2,000 years, rebuilt civilization. But with scant resources, such a civilization has no place for the genetically inferior... or for a geneticist who falls in love with one of them.

As though wiping out the Martian race with Earthborn diseases weren't enough, humans demonstrate a hostile contempt for what relics and monuments the Martians left behind—until one man with a conscience and a gun decides to stand up for the dead. Part of the Martian Chronicles future history.

A strange invisible barrier is frustrating Man's attempts to explore the depths of space. Six expeditions have been lost trying to cross it, their fate a mystery since no signal can pass through the barrier. This is the story of the seventh...

An Private Eye infiltrates an insane asylum to investigate rumors of strange goings-on, and discovers some bizarre physical transformations.

A man is drugged and press-ganged from his own stag party to serve on board a deep space freighter outward bound on a fifteen year round trip to Alpha Centauri.

New York city goes into a panic when Grant's Tomb vanishes into thin air. When a bookish little professor claims responsibility, the press laugh at him... until the Empire State Building goes missing, too.

Classic story of a space engineer who suffers a tragic accident and ends up tramping about the Solar System singing about the life of spacers and dreaming of returning to Earth once more before he dies.

Humanity's descendants aboard a space Ark are divided into two factions—the lower decks occupied by humans, and the upper by mutants. One man dares probe the upper levels and his quest leads him to question not only his society's prejudices, but the ultimate truth of what might lie beyond the Ship.

A statistician begins to suspect that machines worldwide are uniting to overthrow their human masters.