The Morlocks are a group of several fictional comic book mutants associated with the X-Men in the Marvel Comics universe. Created by writer Chris Claremont and artist Paul Smith, they were named after the subterranean race of the same name in H. G. Wells' novel The Time Machine. They first appeared as a group in Uncanny X-Men #169 (May 1983). (Caliban appeared prior to that (in Uncanny X-Men #148), but he was not identified at that point as part of a larger Morlock civilization.)
Unable to pass as normal due to the external physical changes their mutations caused, the Morlocks squatted in a network of abandoned, interconnected tunnels beneath Manhattan, which had originally been built as Cold War bomb shelters and then forgotten. The Morlocks were largely a peaceful group but misguided attempts to gain something from the surface world occasionally brought them into conflicts. The most famous incident ended with Morlock leader Callisto losing a duel to Storm, who then was made their honorary leader.
Due to a series of tragedies, the original Morlocks no longer reside in subterranean New York (except Marrow who was one of the originals as a child), although a violent splinter cell Gene Nation and a comparable group called Those Who Live in Darkness have emerged. Similar groups, called Morlocks by readers and/or the X-Men themselves, have appeared under Chicago and London.
The Morlocks appeared occasionally in the 1990s X-Men animated series and its successor X-Men: Evolution.
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