Aliens versus Predator 2 is a science fiction first-person shooter video game developed by Monolith Productions and published by Sierra On-Line for Microsoft Windows in 2001, and for Mac OS X in 2003. The game is a sequel to Aliens versus Predator (1999); both games are based on the characters of the Alien and Predator media franchises as well as the Alien vs. Predator crossover series. It is set on the fictional planet LV-1201...