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After having drifted in space for 57 years, Ripley is rescued. Her employer accuses her of destroying the Nostromo and does not believe her story about the alien, since the planet is now being colonized and terraformed and no alien ship has been found. When contact is lost with the colony, she is asked to accompany Burke, a representative of the company, and group of colonial marines to investigate. They find the colony destroyed, two alive face-huggers in vats in a laboratory and one little girl called Newt. They locate the other colonists under the fusion-powered atmospheric processor, cocooned in a sort of nest with many eggs, where some of them are still alive and waiting to be taken by face-huggers. They are attacked by several adult aliens when trying to kill a juvenile that just hatched, and some of the marines get killed. They decide to evacuate with the dropship that took them to the surface, but an alien who had climbed aboard causes it to crash; in doing so it damages the fusion reactor which will explode and destroy the colony after a few hours. The survivors barricade themselves in the colony and wait until Bishop, an artificial man and technician with the marines, is able to got outside, reach and hack the colony's transmitter to remotely pilot the second dropship from the spaceship waiting in orbit. Ripley discovers that Burke asked the colony to investigate the alien ship on in the hope to profit from turning the aliens into a biological weapon. Before she can expose him, he attempts to get her and Newt impregnated by the two face-huggers from the lab, that would allow him to smuggle the alien back to Earth. Having failed, Burke flees and is taken by the aliens that attack and kill most of the remaining marines. Ripley, corporal Hicks and Newt try to reach the dropship that is on its way, but Newt is taken by the aliens and Hicks is severely wounded. Ripley arms herself and enters the nest under the fusion reactor where she angers the alien queen laying eggs. She manages to save Newt and escape as the reactor explodes, destroying the aliens' nest, but the queen stows away on the dropship. Ripley manages to push her into an airlock by using an exosuit cargo loader. Then they all go into stasis for their return trip to Earth.

Wikipedia

The crew of the Nostromo ore transporter wakes up, believing they are arriving close to the solar system. Instead, they were woken up to respond to a distress signal from a nearby planet. A team crash-lands near a large alien spaceship. As part of the team repairs the shuttle, others go out and discover the long-dead body of a creature with a hole in its torso. Analyzing the signal, Ripley concludes it's a warning to stay away, not a distress signal. One member, Kane, discovers a chamber containing hundreds of eggs and as one of them opens, a spider-like creature jumps out and attaches to his face, through his helmet. When the shuttle flies back to Nostromo, Ripley insists Kane's body remains in quarantine, but science officer Ash decides to let him in the infirmary, where he tries to remove the creature from Kane's face by cutting one of its legs. The creature's blood is very corrosive and manages to drip through several floors. The creature eventually detaches itself and Kane regains conciousness, but a few hours later he dies as another creature jumps out of his chest. The crew starts hunting the creature, but, having quickly become full-grown, it kills first Brett, and then Captain Dallas who was following it in an air duct. Having to assume command, Ripley learns from Mother, the board computer, that Ash has secretly been ordered by the Company to bring alien creatures back to Earth and that the crew is expendable. She confronts Ash, who tries to kill her, but with the help of Parker they manage to kill him out and discover he's an android. Upon reactivating its head, Ash indicates the alien cannot be killed. The remaining crew decides to self-destruct the Nostromo and to escape in the shuttle. Parker and Lambert are ambushed and killed by the creature, so Ripley initiates self-destruct, and despite the alien initially blocking her way to the shuttle and a failed attempt to cancel the self-destruct, she manages to escape just in time. As she prepares for stasis, she notices the alien is hiding in the shuttle; she puts on a space suit and flushes it out of the airlock. She then prepares for the trip back to Earth.