Discover published sets by community

An alien race, known as the Overlords, arrives on Earth to govern humanity, but with peaceful intentions that eventually lead humanity to the next stage of its evolution.

A linguist is recruited by the military to assist in translating alien communications after twelve mysterious spacecraft appear around the world.

A team of astronauts makes first contact with an enormous, cylindrical space object that contains elaborate environments and ecosystems.

An interstellar radio message sent from Earth reaches an alien civilization, which results in a rich, influential man funding an expedition to meet the alien race.

An insect-like alien species invades Earth, causing global warfare, which is later ended due to negotiations by a young military genius.

Humans find a mysterious, obviously artificial, object buried beneath the lunar surface and, with the intelligent computer H.A.L., sets off on a quest.

A human space envoy comes to a planet populated by an alien species living in a medieval society and must adapt to their ways.

Following a devastating war with alien Taurans, a soldier enlists in an elite military unit, where time dilation causes him to age months while Earth experiences centuries.

An extraterrestrial object appears in Earth's solar system, and an expedition is launched to explore this interstellar object shaped like a long cigar.