In Alien, there is a scene in which

Brett is killed by the Alien while searching for Jones the cat.

After this happens, the other members of the crew know this happened, and apparently know where it happened, saying that the Alien must have gone through the air ducts. There don't seem to be many surveillance systems on board, as, when the Alien disappears from Kane's face in the medical ward, they don't have any idea where it went. Then, when it is being chased through the air ducts, they have a small display of where it is. How are they tracking the Alien, and how do they know what happened to Brett?


From the screenplay:

How are they tracking the alien

Ash has constructed motion detectors:

              Now if we could only find it.

    Ash picks up a portable unit.

              I've taken care of that...tracking
              device.  You set it to search for
              a moving object...It hasn't much
              range but when you get within a
              certain distance it starts beeping.

    Ripley takes the tracker from Ash's hand.

              What's it key on.

              Micro changes in air density.
              Keep it pointed ahead of you.

How do they know what happened to Kane

I'm not sure if you mean Kane, or one of the other characters. Kane is the one who has the facehugger attached to him. His fate is witnessed by the rest of the crew when

the alien bursts out of his chest while he is seated in the mess hall with them all.

UPDATE: How do they know what happened to Brett

Brett, Parker, Ripley and Dallas try and capture the alien using a net, but end up startling the ship's cat Jonesy. Concerned that the cat wandering around might confuse their motion tracker, Brett heads after the cat to catch it. Then, according to the screenplay..

              Here kitty...Come on Jones.

    Brett reaches for Jones.
    Jones hisses.
    An arm reaches for Brett.
    The Alien.
    Now seven feet tall.
    Hanging from the undercarriage strut in reverse position.
    Grabs Brett and swings up into darkness.
    Brett screams.
    To no avail...
    In the doorway Ripley and Parker.
    They witness the horror.

In the scene as actually shot (from the director's cut), Ripley and Parker arrive moments after the alien and Brett have disappeared but it's clear to them that the alien has taken Brett.

  • I meant Brett, sorry – Stormblessed Mar 18 at 13:35
  • +1 That's interesting about the scene being different in the script and director's cut. – Stormblessed Mar 19 at 23:16
  • How did they see where the alien was with the motion trackers? All the portable ones apparently could do was beep if they could sense anything, but they had a display of where it was in the air ducts. – Stormblessed Mar 19 at 23:18

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