In our reality, Marrow hid herself as a young girl in the sewers underneath New York City as a member of the Morlocks, a group of mutants who were also physically deformed. Marrow managed to survive the Morlock massacre by the Marauders and was later taken, as a young girl, to another dimension by the mutant Mikhail Rasputin in order to survive the destruction of the Morlock Tunnels. Time passed quicker in the other dimension, and Marrow returned a few years later as a full-grown adult leading Gene Nation, a rebel faction of Morlocks who wanted revenge for the massacre. Marrow later resurfaced in New York in order to stop the Prime Sentinels of Operation Zero Tolerance when encountered the X-Man Iceman and the mutant Dr. Cecilia Reyes, and subsequently became a member of the X-Men.
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