Alien invasion or space invasion is a common feature in science fiction stories and film, in which extraterrestrial lifeforms invade the Earth to exterminate and supplant human life, enslave it, harvest people for food, steal the planet's resources, or destroy the planet altogether. It can be considered as a science-fiction subgenre of the invasion literature, expanded by H. G. Wells's seminal alien invasion novel The War of the Worlds.
UFO conspiracy theories are a subset of conspiracy theories which argue that various governments and politicians globally, in particular the United States government, are suppressing evidence that unidentified flying objects are controlled by a non-human intelligence or built using alien technology. Such conspiracy theories usually argue that Earth governments are in communication or cooperation with extraterrestrial visitors despite public disclaimers, and further that some of these theories claim that the governments are explicitly allowing alien abduction.
The extraterrestrial hypothesis (ETH) proposes that some unidentified flying objects (UFOs) are best explained as being physical spacecraft occupied by extraterrestrial intelligence or non-human aliens, or non-occupied alien probes from other planets visiting Earth.
The Flying Saucers Are Real by Donald Keyhoe, was a book that investigated reports of UFOs by United States Air Force fighters, personnel, and other aircraft, between 1947 and 1950.
The Invaders is an American science-fiction television series created by Larry Cohen that aired on ABC for two seasons, from 1967 to 1968. Roy Thinnes stars as David Vincent, who after stumbling across evidence of an in-progress invasion of aliens from outer space—the aliens disguising themselves as humans and gradually infiltrating human institutions—tries to thwart the invasion despite the disbelief of officials and the general public, and the undermining of his efforts by the aliens. The series was a Quinn Martin production.
Stanton Terry Friedman was an American nuclear physicist and professional ufologist who resided in New Brunswick, Canada. He was the original civilian investigator of the Roswell UFO incident.
Little green men is the stereotypical portrayal of extraterrestrials as little humanoid creatures with green skin and sometimes with antennae on their heads. The term is also sometimes used to describe gremlins, mythical creatures known for causing problems in airplanes and mechanical devices. Today, these creatures are more commonly associated with an alleged alien species called greys, whose skin color is described as not green, but grey.
Jacques Fabrice Vallée is an Internet pioneer, computer scientist, venture capitalist, author, ufologist and astronomer currently residing in San Francisco, California and Paris, France.
Contactees are persons who claim to have experienced contact with extraterrestrials. Some claimed ongoing encounters, while others claimed to have had as few as a single encounter. Evidence is anecdotal in all cases.
Earth vs. the Flying Saucers is a 1956 American science fiction film from Columbia Pictures. It was produced by Charles H. Schneer, directed by Fred F. Sears, and stars Hugh Marlowe and Joan Taylor. The stop-motion animation special effects were created by Ray Harryhausen. The storyline was suggested by the bestselling 1953 non-fiction book Flying Saucers from Outer Space by Maj. Donald Keyhoe. The film was released as a double feature with The Werewolf.
It Came from Hollywood is a 1982 American comedy documentary film compiling clips from various B movies. Written by Dana Olsen and directed by Malcolm Leo and Andrew Solt, the film features wraparound segments and narration by several famous comedians, including Dan Aykroyd, John Candy, Gilda Radner, and Cheech and Chong. Sections of It Came from Hollywood focus on gorilla pictures, anti-marijuana films and the works of Ed Wood. The closing signature song was the doo wop hit "What's Your Name" by Don and Juan.
Nicholas Redfern is a British best-selling author, journalist, cryptozoologist and ufologist.
Flying Saucers from Outer Space is a non-fiction book by Donald Keyhoe about unidentified flying objects, aka UFOs.
Frankenstein Meets the Space Monster is a 1965 science fiction film. It was directed by Robert Gaffney and starred Marilyn Hanold, James Karen and Lou Cutell. It was filmed in Florida and Puerto Rico in 1964.
A flying saucer is a descriptive term for a type of flying craft having a disc or saucer-shaped body, commonly used generically to refer to an anomalous flying object. The term was coined in 1947 but has generally been supplanted since 1952 by the United States Air Force term unidentified flying objects. Early reported sightings of unknown "flying saucers" usually described them as silver or metallic, sometimes reported as covered with navigation lights or surrounded with a glowing light, hovering or moving rapidly, either alone or in tight formations with other similar craft, and exhibiting high maneuverability.
Ancient astronauts have been addressed frequently in science fiction and horror fiction. Occurrences in the genres include:
