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Karen Marshall was one of the crew of a 367th century mining rig on the planet Mercury. The rig was used on the planet's surface to find and extract rare minerals. She believed herself the sole survivor of the crew when a "monster" took the other crew members. Actually the "monster" was a Mercurian energy beast warning them of an impending lava geyser below the rig and who was responsible for removing the crew to safety until it was OK to return to the rig. (COMIC: Hot Stuff!)