Alien

During the play locations/Mystery Markers phase of the Alien player's turn, he may play the Alien card face-down from his hand onto his face-down Chestburster. The creature has evolved into the adult Alien. The Chestburster is now a decoy Mystery Marker (effectively serving as the shed skin that Brett found on C-Deck), and once revealed, becomes a dud.

The Alien moves about the Nostromo like any Mystery Marker but, like all of the Alien player's Characters, must be turned face-up when present at the same location as any crewmember. The Alien may act at the same location as any crewmember to kill him or her. When this happens, the crewmember is placed face-up on the Crew player's Victims pile.

The Alien player wins the game when all of the Nostromo's human crew have been killed. Each crewmember in the Crew player's Victims pile at the end of a game won by the Alien garner the Alien player one victory point. Additionally, each crewmember in the Lair who is also in the Victims pile earns him an additional point. Crewmembers killed by the Robot, being ejected, or by being caught in the Nostromo's detonation earn the player no victory points.

Alien and Air Shafts
At any time, as an Interrupt, the Alien player may connect any number of Air Shaft cards from his hand to the Alien's location (provided these cards can legally connect). The Alien may then make one free double move into the shaft. Once the Alien has used an Air Shaft in this fashion, it may not exit the shaft on its next turn via the same route that it came in.

Killing the Alien
If the Nostromo's crew can kill the Alien, they have won the game. There are only three ways to achieve this goal, however. These are:
 * Act to kill the Alien with a Flamethrower at the Alien's location.
 * Act to eject the Alien out of the Main Airlock, or, if the shuttle has launched, out of the Shuttle Narcissus or Shuttle Lock.
 * Detonate the Nostromo with the Alien aboard.