In the fictional universe of Star Trek, the Prime Directive is a guiding principle of Starfleet that prohibits its members from interfering with the natural development of alien civilizations. Its stated aim is to protect unprepared civilizations from the danger of starship crews introducing advanced technology, knowledge, and values before they are ready. Since its introduction in the first season of the original Star Trek series, the directive has featured in many Star Trek episodes as part of a moral question over how best to establish diplomatic relations with new alien worlds.
The Man Who Fell to Earth is a 1963 science fiction novel by American author Walter Tevis, about an extraterrestrial who lands on Earth seeking a way to ferry his people to Earth from his home planet, which is suffering from a severe drought. The novel served as the basis for the 1976 film by Nicolas Roeg as well as a 1987 television adaptation and a 2022 television series.
Fallen Dragon is a science fiction novel by British writer Peter F. Hamilton. It was first published in 2001 by Macmillan. It follows the adventures of the mercenary Lawrence Newton as he attempts to capture what he believes is a fabulous treasure, only to find something of much greater importance.
The Hour of the Bull is a social science fiction novel written by Soviet author and paleontologist Ivan Yefremov in 1968. Six months after its publication in book form in 1970 Soviet authorities attempted to remove it from libraries and bookshops after realizing that it contained a sharp criticism of the current state of affairs in the USSR disguised as a critique of "Capitalism" and Chinese-style communism of that time. It was published again in the 1980s "perestrojka" and thereafter.
Many works of fiction have featured UFOs. In most cases, as the fictional story progresses, the Earth is being invaded by hostile alien forces from outer space, usually from Mars, as depicted in early science fiction, or the people are being destroyed by alien forces, as depicted in the film Independence Day. Some fictional UFO encounters may be based on real UFO reports, such as Night Skies. Night Skies is based on the 1997 Phoenix UFO Incident.
The Void Trilogy is a space opera series by British author Peter F. Hamilton. The series is set in the same universe as The Commonwealth Saga, 1,200 years after the end of Judas Unchained.
Atari Force is the name of two comic book series published by DC Comics from 1982 to 1986. Both were loosely based on trademarks of Atari, Inc.
The World Swappers is a science fiction novel by British writer John Brunner. It was first published in the United States in 1959, as one half of Ace Double D-391. The other half was Siege of the Unseen by A. E. van Vogt. Reprinted by Ace 1967, 1976.
"Entity" is a science fiction short story by American writers Poul Anderson and John Gergen, which appeared in the June 1949 issue of Astounding Science Fiction. "Entity" was the fifth story published by Anderson, and the only story published by Gergen, a friend of him from the Minneapolis Fantasy Society.
Illegal Aliens is a science fiction comedy novel written by Nick Pollotta and Phil Foglio.
Starship Invasions is a 1977 Canadian science fiction film directed, produced and written by Ed Hunt and filmed in Toronto, Ontario. It was re-released in the United Kingdom as Project Genocide.
Foreigner is a science fiction novel by the Canadian author Robert J. Sawyer, originally published in 1994 by Ace Books. It is the final book of the Quintaglio Ascension Trilogy, following Far-Seer and Fossil Hunter. The book depicts an Earth-like world on a moon which orbits a gas giant, inhabited by a species of highly evolved, sentient Tyrannosaurs called Quintaglios, among various other creatures from the late Cretaceous period, imported to this moon by aliens 65 million years earlier.
Ancient astronauts have been addressed frequently in science fiction and horror fiction. Occurrences in the genres include:
Pathfinder (2010) is a science fiction novel by American author Orson Scott Card. The novel tells the story of Rigg and his unusual ability to perceive the "paths" of living things throughout time. It is the first book in the completed Pathfinder series, and is followed by Ruins and Visitors.
Ruins (2012) is a science fiction novel by American author Orson Scott Card, who is known for his novel Ender's Game. This novel continues the story of Rigg, and his strange powers. It is the second book in the Pathfinder series and is followed by Visitors, the first book is Pathfinder. The book was published on October 30, 2012.
The Pathfinder series is a completed series of novels by Orson Scott Card that is notable for its unusual fusion of the themes of science fiction and fantasy, with some elements of historical fiction. One significant aspect of the Pathfinder series is its uniquely complex but well documented set of time travel rules.
