Background:

The first X-File case was personally initiated by Director J. Edgar Hoover in 1946. Seven murders in Browning, Mont., plus more elsewhere in the Northwest, involved victims who were shredded and eaten in a pattern matching no known animal. Police in Glacier National Park, following a hot pursuit, cornered and shot dead what several eyewitnesses swore to be a wolf-like animal on two legs, but which proved to be a man named Richard Watkins. Though nothing related to the animalistic claw and fang marks were ever found, the animalistic murders perhaps coincidentally ceased.

Hoover's secretary, for office-space reasons, began placing similar inexplicable cases in the little-used "X" drawer of her file cabinet. Her casual name for these files later became official.