The Dark Beast

Henry McCoy was a genius. He became one of Apocalypse's leading scientists and spent his time working on expanding genetic mutation along side his mentor, Nathan Essex, the man known as Sinister. McCoy was responsible for creating the process needed to build the gene-spliced Infinite army used by Apocalypse to take over much of the world. He would normally take those mutants deemed unfit for survival by Apocalypse and perform gruesome experiments, attempting to create an unbeatable army of enhanced mutants for his master.

McCoy also conducted experiments on himself attempting to make himself the perfect mutant. Instead, he turned himself into a monster known throughout the Breeding Pens as the Dark Beast. During the final days of Apocalypse, McCoy became even more radical on his experiments. He burned through thousands of mutants looking for the ideal combination of genetic power. Jean Grey and Prelate Scott Summers freed many of the mutants the Dark Beast kept in his Breeding Pens. The Dark Beast, knowing Apocalypse's kingdom was falling, teleported himself into the M'Kraan Crystal, taking his chances on the millions of realities that lay inside of it.

The Dark Beast travelled back in time and ended up in the Marvel Universe's reality as Legion was attempting to murder Magneto. It is believed he is responsible for the creation of the Morlocks and Gene Nation, as well as many others. At one point, the Dark Beast kidnapped the good Henry McCoy from the X-Men and entrapped him. The good Beast eventually escaped and returned to the X-Men. The Dark Beast eventually escaped and had not been seen until recently when he reemerged in Genosha where Professor Xavier and Magneto have been trying to rebuild. Dark Beast tried to take them prisoner, which didn't work, and instead has agreed to a truce. He almost got killed following this by a group of Age of Apocalypse refugees, including the Sugar Man.