Ripley activates the engines, blasting the alien into space.
After recording the ship’s final log entry, she places herself and Jones into stasis for the voyage home.
Accessing Mother, Ripley discovers that Ash has secretly been ordered to return the alien to the crew’s employers, who consider the crew expendable.
When Ripley confronts Ash, he tries to choke her to death.
The crew are unable to remove the creature from Kane’s face, as its grip is strong and its blood is an extremely corrosive acid. Since attacking the creature with conventional weapons could result in its corrosive blood breaching the ship’s hull, the crew attempts to locate and capture it with motion trackers, nets, electric prods, and flamethrowers.
They discover the signal is coming from a derelict alien spacecraft.
After a heated discussion, the group devises a plan to jettison the creature out of the ship.
Dallas enters the Nostromo’s labyrinthine ventilation shafts, intending to force the alien into an airlock, but it ambushes him.
They learn he was assigned to the Nostromo to convince the crew to capture the creature and return it for analysis, even at the expense of the human personnel.
Ash taunts them about their chances of survival against the “perfect organism.” Parker turns a flamethrower on Ash.