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Dallas, Kane, and Lambert discover that the signal is coming from a derelict alien spacecraft. Inside it they find the remains of a large alien creature whose ribs appear to have been exploded outward from the inside. Meanwhile, the Nostromo's computer partially deciphers the signal transmission, which Ripley determines to be some type of warning. Kane discovers a vast chamber containing numerous eggs, one of which releases a creature that attaches itself to his face. Dallas and Lambert carry the unconscious Kane back to the Nostromo, where Ash allows them inside against Ripley's orders to follow the ship's quarantine protocol. They unsuccessfully attempt to remove the creature from Kane's face, discovering that its blood is an extremely corrosive acid. Eventually the creature detaches on its own and is found dead. With the ship repaired, the crew resume their trip back to Earth.

Kane awakens seemingly unharmed, but during a meal before re-entering stasis he begins to choke and convulse until an alien creature bursts from his chest, killing him and escaping into the ship. Lacking conventional weapons, the crew attempt to locate and capture the creature by fashioning motion trackers, electric prods, and flamethrowers. Brett follows the crew's cat into a large room where the now-fully-grown Alien attacks him and disappears with his body into the ship's air shafts. Dallas enters the shafts intending to force the Alien into an airlock where it can be expelled into space, but it ambushes him. Lambert implores the remaining crew members to escape in the ship's shuttle, but Ripley, now in command, explains that the shuttle will not support four people.

Accessing the ship's computer, Ripley discovers that Ash has been ordered to return the Alien to the Nostromo's corporate employers even at the expense of the crew. Ash attacks her, but Parker intervenes and decapitates him with a blow from a fire extinguisher, revealing Ash to be an android. Before Parker incinerates him, Ash predicts that the other crew members will not survive. The remaining three crew members plan to arm the Nostromo's self-destruct mechanism and escape in the shuttle, but Parker and Lambert are killed by the Alien while gathering the necessary supplies. Ripley initiates the self-destruct sequence and heads for the shuttle with the cat, but finds the Alien blocking her way. She unsuccessfully attempts to abort the self-destruct, then returns to find the Alien gone and narrowly escapes in the shuttle as the Nostromo explodes.

As she prepares to enter stasis, Ripley discovers that the Alien is aboard the shuttle. She puts on a space suit and opens the hatch, causing explosive decompression which forces the Alien to the open doorway. She shoots it with a grappling gun which propels it out, but the gun is caught in the closing door, tethering the Alien to the shuttle. It attempts to crawl into one of the engines, but Ripley activates them and blasts the Alien into space. Ripley puts herself and the cat into stasis for the return trip to Earth.

[edit] Origins

Dan O'Bannon wrote the screenplay for Alien. While studying cinema at the University of Southern California, Dan O'Bannon had made a science fiction comedy film with director John Carpenter and concept artist Ron Cobb entitled Dark Star.[12] The film included an alien which had been created using a spray-painted beach ball, and the experience left O'Bannon "really wanting to do an alien that looked real."[12][13] A few years later he began working on a similar story that would focus more on horror: "I knew I wanted to do a scary movie on a spaceship with a small number of astronauts", he later recalled, "Dark Star as a horror movie instead of a comedy."[12] Ronald Shusett, meanwhile, was working on an early version of what would eventually become Total Recall.[12][13] Impressed by Dark Star, he contacted O'Bannon and the two agreed to collaborate on their projects, choosing to work on O'Bannon's film first as they believed it would be less costly to produce.[12][13] O'Bannon had written twenty-nine pages of a script entitled Memory comprising what would become the film's opening scenes: a crew of astronauts awaken to find that their voyage has been interrupted because they are receiving a signal from a mysterious planetoid. They investigate and their ship breaks down on the surface.[13][14] He did not yet, however, have a clear idea as to what the alien antagonist of the story would be.[12]