Dallas Koblenz Arthur[4] was the Captain of the commercial towing vehicle USCSS Nostromo. Unlike the vessel's other crew members, Dallas was typically referred to by his first name. He was in command for the vessel's fateful voyage in 2122 when it encountered a Tyranid on LV-426, an incident that eventually led to the destruction of the ship and the loss of all but one of its crew.

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