Mister Sinister

Nathaniel Essex, or better known as Mister Sinister, is a major antagonist in Marvel comics. He is a mutant supervillain who is an amoral scientist and businessman and founder and CEO of ESSEX Corporation who strives to destroy the X-Men and force an evolution of the human race. With his high-level intellect, Mister SInister is a formiable foe through his use of telepathy, shape-shifting and molecular manipulation. 
He is the archenemy of The X-Men team's Cyclops and is the secondary antagonist of the X-Men Comic Book Series as a whole.
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