The Martians of The X-Files have some qualities similar to the Gelth of Doctor Who and a multitude of incorporeal entities in Star Trek. When Belt threw himself out a window in an attempt to prevent the entity from infesting another, the entity died along with Belt himself. The alien attempted to flee but an example of the strong bond between entity and host was exhibited by Belt's physical struggle, in a hospital room, with the entity which occupied him the entity made an effort to the contrary but Belt was able to keep it attached to himself temporarily. On an extravehicular space walk in 1966, a Martian entity attached itself to Lieutenant Colonel Marcus Aurelius Belt. Realizing an entity plagued him and where it had come from, he sabotaged what Space Shuttle missions he could, during his time at NASA, in an effort to prevent others from becoming similarly infested. An exhaustive internal struggle with the entity caused Lieutenant Colonel Belt to collapse. (TXF: 'Tunguska', 'The Truth') In 1947, a police officer named. (TXF: 'Space') About four billion years ago, a rock from Mars may have crashed to Earth. (TXF: 'Syzygy') Ten months a year, solar winds blow across the planet's surface at 300 miles an hour. Martian entities resemble the Face on Mars, vaguely human, but are incorporeal. They appear to have the ability to fly and are parasitic. The entities are able to survive without a human host, but appear to prefer them, entering and leaving at will. An afflicted human's face may temporarily and spontaneously appear as that of the entity. Some form of powerful bond exists between entity and host. (TXF: 'Space') It comes into conjunction with Mercury and Uranus only once every eighty-four years. Martians are aliens native to planet Mars. A Martian possessing Marcus Aurelius Belt.

Beware the face of mars xfiles