After crash-landing on a desolate planet, Ellen Ripley finds herself in a prison colony with a group of dangerous inmates. As they struggle to survive, they soon discover a deadly alien creature is stalking them, and they must find a way to stop it before it kills them all.

In the sequel to the popular sci-fi horror film Alien, a group of Marines is sent to investigate a space colony that has lost contact with Earth. They soon discover that the colony has been overrun by deadly creatures known as xenomorphs, and must fight for their lives to survive.

After 200 years, a powerful human/alien hybrid clone of Ellen Ripley helps a crew of space pirates prevent aliens from reaching Earth. The clone, with her retained memories and unusual strength, fights against the military and teams up with the pirates. They face alien attacks, betrayal, and the discovery of previous failed Ripley clones. Together, they try to crash the ship carrying the aliens before they can escape and wipe out humanity.

In the far reaches of deep space, the crew of a commercial spacecraft investigates a mysterious transmission and discovers a derelict spacecraft on a planetoid. One of the crew members, Kane, is attacked by a strange lifeform that attaches itself to his face. As they try to remove the creature, they realize it is feeding on oxygen and may be keeping Kane alive. The crew must now deal with the growing threat of the unknown lifeform and find a way to survive.