Set in the science fiction realms of the film franchise crossover, Aliens vs. Predator is a high-definition action-adventure composed of tense, violent, kill-or-be-killed scenarios. Following the design concept of earlier AvP shooters, the game pits three different factions against one another. Players take the roles of deadly xenomorph aliens, stealthy predators, and heavily armed space marines, to do battle with enemies from the other two factions. Evolved to protect the brood, the alien xenomorphs are unmatched in melee combat, and excel at surprise attacks with their overpowering strength. Born of a species of hunters, the predator is a master of well-timed assaults and agile attacks. Physically weak but at a technological advantage, the human marines use heavy firepower to take down enemies from a distance. In many of the game's levels, warriors from all three factions must fight against one another in the same battles, at the same time. Players will have to fight hard to survive, but it pays to fight smart, as well. In some situations, characters can manipulate the environment, or accomplish other puzzle-solving feats, in order to put their enemies at a disadvantage. Single players take the roles of each species in turn, as they progress through the game's three campaigns. Multiplayer configurations are also available to Internet-connected gamers, offering the chance to play against other human-controlled warriors, in deathmatch and team-based competitions. Sega's Aliens vs. Predator was developed by Rebellion, whose previous work with the series includes Aliens vs. Predator: Requiem for PSP, the 1999 home computer game Aliens Versus Predator, and 1994's well received Alien vs. Predator for Atari Jaguar. In creating the game's three-pronged storyline, designers took special inspiration from the original films and from the Dark Horse comics series.