|See also:||X-Files terminology|
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Ratboy was the most common fannish nickname for Alex Krycek, though he was never called that in any of the episodes. Other fannish nicknames include Skippy, Weasel and Weaselboy, none of which ever approached the popularity of "Ratboy."
Note: Even more so than most popular fannish shows, X-Files had a fairly dense set of nicknames, acronyms, nearly-impenetrable in-jokes and hard-to-remember initialisms -- it also invented some that have become part of larger media fandom, such as UST for Unresolved Sexual Tension.