Grey alien

A humanoid extraterrestrial figure in UFO lore, typically depicted as small, hairless, gray-skinned, and large-headed with large black eyes.

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Barney and Betty Hill: An American couple whose reported 1961 UFO encounter became a widely publicized account of alleged alien abduction. Their account helped establish the abduction narrative later associated with Grey aliens.
UFO abduction: A reported experience in which people say extraterrestrials took them aboard a craft, often for examination. Grey aliens became the characteristic beings in many modern abduction accounts.
Little green men: A traditional comic or folkloric image of small green extraterrestrials. This older popular image differs from the Grey’s gray skin and oversized black eyes.
Communion (book): Whitley Strieber’s 1987 autobiographical account of experiences he interpreted as encounters with nonhuman beings. Its cover portrait became one of the most recognizable Grey-like faces.
Hypnosis in UFO abduction claims: The use of hypnosis to elicit or investigate memories reported as extraterrestrial abductions. Many detailed Grey-alien accounts emerged during hypnosis, whose reliability as memory retrieval is disputed.
The Interrupted Journey: John G. Fuller’s 1966 book recounting the reported UFO encounter and hypnosis sessions of Barney and Betty Hill. Its account brought the Hills’ story and its alien imagery to a broad audience.
Alien abduction in popular culture: The representation of alleged extraterrestrial kidnappings in books, films, television, and other media. Popular retellings spread Grey-alien imagery beyond UFO subcultures.
Reptilian humanoid: A fictional or conspiratorial humanoid described as reptile-like, sometimes said to disguise itself as human. Reptilian figures are a distinct alleged alien type, not a variant of the Grey.
The UFO Incident: A 1975 television film dramatizing the reported abduction of Barney and Betty Hill. It translated the Hills’ account into a widely seen visual depiction of their alleged captors.
Sleep paralysis: A temporary inability to move or speak while falling asleep or waking, sometimes accompanied by vivid hallucinations. It can produce frightening sensed presences that resemble reported abduction experiences.