20 Things You Somehow Missed In Alien
5. "Mother"
An unseen - but nonetheless vital - character in Alien is Mother. The semi-sentient computer of the Nostromo, she was officially identified on-screen as being a '182 Model 2.1 Terabyte AI Mainframe'. She awoke the crew from hypersleep and, later in the film, was revealed to have worked with Ash to preserve the specimen.
However, the name 'Mother', isn't strictly accurate. It's only revealed in one quick shot as Ripley attempts to enter the mainframe, but the computer is actually designated 'MU-TH-UR'. What this is an acronym for hasn't been revealed, but it's certainly a handy space coincidence that it doubles as such a sinister name.