The X-Files premiered in 1993, created by Chris Carter and starring David Duchovny and Gillian Anderson as FBI agents investigating paranormal cases. Mark Snow composed the theme, whose whistling lead became one of television's most recognizable motifs. The show returned for a tenth season in 2016, renewing interest in the intro among younger viewers. Shortened clips of the theme, often paired with the show's conspiratorial tone, later circulated as reaction audio on soundboards and in edits, where a few notes are enough to suggest aliens, secrets or a cover-up.