The Colonists are an extraterrestrial species in the science fiction television show, The X-Files, as well as the first X-Files feature film. The mystery revolving around their identity and purpose is revealed across the course of the series. In the series' plot, the Colonists are collaborating with a group of United States government officials known as the Syndicate in a plan to colonize the Earth, hence their name.
According to the series mythology, an extraterrestrial lifeform, known in the series' mythology simply as the Colonists, were originally present on Earth in the early stages of human evolution. They highly resemble the well-known "grey aliens" in their mature form. In their immature stage, they are more yellowish colored, tall, and very aggressive, possessing fangs, claws and scale-like texture of their skin. This immature form is a protective stage, able to viciously defend itself from birth. This outer skin is eventually shed when the alien develops into its mature form. The immature form resembles that of a reptilian extraterrestrial and is referred to as the "long-clawed" form.