This was a game based on the movie "Alien". If I recall, it came in a small plastic box, kind of like Ogre might have back in the late 70's early 80's. I am pretty sure it was hex based, and there were little blips that moved representing something being detected by motion trackers.
I am also pretty sure that you could get things like nets and shock prods to try and capture the Alien with.
Am I off base here, or did something like this exist at one point? Maybe an old Steve Jackson game or something?