The Aliens are considered very weak and vulnerable and only have their claws and tails as weapons, but possess great speed and the ability to climb on walls and ceilings. When the power in the colony goes out, Six escapes and begins to wreak havoc against the humans and propagate his species across the planet. Captured and raised by Weyland-Yutani scientists, Six has been hearing the call of the Matriarch for a period of time, desperate to escape and join his brethren.

Aliens: The player takes control of an Alien nicknamed 'Six'. There is also the iconic motion tracker that can pick up on enemy movement, flares and a flashlight for seeing in very dark spaces and stims that will replenish their health.

There are various weapons such as a pistol, pulse rifle, sniper rifle, flamethrower, shotgun and the smart gun the player can use against the various enemies scattered throughout the stages. Once arriving they realize that a Alien outbreak has occurred and the player must traverse various environments.

Marines: The player takes control of the 'Rookie' as they are dispatched to the planet to investigate the distress signal. This is where the story begins for the three factions: Curious, they decide to forcibly open the doors and cause a massive energy backlash that causes the power on the entire planet to go out, unleashing hell in the process. The story takes place on the planet designated BG-386, in a mining colony owned by the Weyland-Yutani Corporation where they have found a mysterious site an ancient pyramid that depicts an unknown alien race and the Xenomorphs. Aliens vs Predator is an update of the 1999 PC game Aliens Versus Predator, in which the player can choose either Marine, Xenomorph (commonly known as Aliens) or Predator in a first-person shooter.

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