The huge spaceship the Xeno is en route to a new world light years from Earth, its payload of more than 50,000 cryogenically frozen colonists watched over by a supercomputer and a skeleton crew of only a dozen people.

When the ship comes into contact with a seemingly inert alien artefact drifting in space, the crew believes they've made a momentous discovery for all humankind. They’re unaware it’s the eve of true horror.

Soon it becomes clear the crew has unwittingly woken an evil so ancient and so powerful it threatens not only the ship and its slumbering passengers, but the future of the human race itself.