The alien spider was a creature that was grafted into the body of three men, Edward Skur, Gissing and Oberman, as part of a secret experiment. The two other men apparently killed themselves after learning what had been done to them. Skur remained alive and began killing people. The spider forced its way out of his mouth to feed on the victims, removing their internal organs and soft tissue, leaving them as a crumpled shell. In an attempt to discover how Skur had killed his partner, Arthur Dales requested an autospy on Dr. Oberman, who also had been experimented on. He then discovered the spider inside Oberman's body & learned the truth. (TXF: "Travelers")

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