He hired a group of thugs, whom he named Marauders, to kidnap people off the streets of London so he could perform experiments on them he even went so far as to dig up his dead son and experiment on him. He approached many groups in search of funding, including the Hellfire Club, though all turned him down. His son’s death (at the age of four from numerous birth defects, including crooked bones & hemophilia) drove him deeper into his work. His theories were mocked, making him bitter. While pursuing his own research in 1859, he discovered that humanity was undergoing increasing mutation, due to what he called “Essex Factors” in the human genome. Sinister's future selves upload their memories into Moira upon her death, she resurrects at the moment of her birth (or creation, in the case of a clone) with all her memories - memories that the present Sinister can then upload into his own mind.Nathaniel Essex was a biologist in Victorian England who developed advanced theories on human evolution and was obsessed with Darwin’s Theory of Evolution, though he felt Darwin and his contemporaries were shackled by too many moral constraints. But he's also diabolical in the extreme when he reveals his plan to gain leverage on everyone in Krakoa: he's used clones of Moira MacTaggart to take advantage of her unique mutant ability. He's quite theatrical, even to the point of absurdity. In Immortal X-Men #1, readers see the events of the story play out from Sinister's perspective. They are privy to his thoughts on every subject and they see his disdain for nearly everyone on the Quiet Council - and he barely tries to hide it.

Related: Captain Marvel's Haters Have The X-Men Movies To Blame Sinister to drive a story, and fortunately, he's more than up to the task. With their most popular villain overused to the point of tiring the audience, the MCU must rely on the likes of Mr. Magneto has overshadowed them all the Master of Magnetism has appeared in every single X-Men film excluding the Wolverine trilogy and The New Mutants in 2020. 21st Century Fox's X-Men franchise has used plenty of villains in the 20 year-history of the series, including Stryker, Sabertooth, Sebastian Shaw, and the alien Vuk (who was initially meant to be Lilandra of the Shi'ar Empire before Dark Phoenix underwent numerous reshoots).

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