An expansion pack to Aliens versus Predator 2, titled Aliens versus Predator 2: Primal Hunt, was developed by Third Law Entertainment, published by Sierra Entertainment, and released through Fox Interactive in 2002. It was also included in the "Gold Edition" of Aliens versus Predator 2 released the same year, which bundled the original game and the expansion pack into a single package. Primal Hunt adds new weapons and multiplayer maps to the original game, as well as a single-player campaign which serves as a prequel to the storyline of Aliens versus Predator 2. The player is once again able to play as either a human, Predator, or Alien character, each with its own campaign and abilities. The plot lines of the three characters intersect and set up the events of the original game.