- "I thought you would like me to join you running. My name is Marcus."
- ―Marcus (from Alien: The Cold Forge)
Marcus was a synthetic employee of the Weyland-Yutani Corporation and an assistant aboard RB-232, known as "The Cold Forge". As well as his other duties on the station, he notably served as Dr. Marsalis' surrogate body, allowing her to conduct her day-to-day business while she herself was bed-ridden. He was serving aboard the station when it was sabotaged by Seegson agents, and was caught up in the devastating Xenomorph outbreak that led to its destruction.
Marcus was one of only two people to escape the Cold Forge, the other being Dr. Marsalis, although he was seriously damaged and later deactivated at his own request.