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Arthur Koblenz Dallas, played by Tom Skerritt, is a character in the 1979 film Alien.
Dallas is the captain of the Nostromo and the only human crew member with access to Mother, the onboard computer. When he receives a distress signal from the Derelict, an Engineer ship, Dallas steers the Nostromo off course to investigate the beacon.
After the Alien hatches from Kane's chest and kills Samuel Brett, Dallas enters the ship's labyrinthine air duct network to lure it to the airlock and eject it into space. He is attacked by the Alien and disappears – presumed dead – leaving only his flamethrower.