Aliens: Countdown is a 14-part comic book short story that was first published by Dark Horse Comics in the promotional publication Dark Horse Insider, Vol. 1 #14-27, from September 1990-October 1991. Published in black and white, the story was written by Mike Richardson and illustrated and inked by Den Beauvais. The comic serves as a tie-in to the four-issue series Aliens (1989 series). In the Aliens comics line, Aliens: Countdown was preceded by Aliens: Advent/Terminus, published concurrently with Aliens: Earth War, Aliens: Reapers, Aliens: The Alien and Aliens: Genocide, and was followed by Aliens: Hive.