Inciting Event: The ship receives an ostensible distress call.
First Plot Point: The alien larva latches onto Kane’s face.
First Pinch Point: The alien detaches from Kane and disappears.
Midpoint: The matured baby alien bursts out of Kane’s chest.
Second Pinch Point: Captain Dallas is killed.
Third Plot Point: Ash reveals that the mission all along was to capture the alien and that it is unkillable.
Climax: Ripley discovers the alien in her escape pod.
Climactic Moment: Ripley kills the alien.
Resolution: Ripley dictates the final entry in the ship’s log.