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|Real Name||Nathaniel Essex|
|Species||Mutant (Homo superior)|
|Movie|| X2: X-Men United (mentioned)|
X-Men: Apocalypse (mentioned)
|Game||X2: Wolverine's Revenge|
|Status|| Unknown (original timeline)|
Alive (revised timeline)
Nathaniel Essex is a mutant, and the head of the Essex Corporation.
His name appeared on Stryker's Computer.
After the massacre at Alkali Lake, the Essex Corporation came to collect samples of Wolverine's blood and data on his adamantium enhancements, as well as all the samples and information on all the other mutants at the facility.
To be added
- In the comics, Essex was a mutant known as Mr. Sinister who has superhuman physical and mental abilities. This has not yet been explored in film to date.
- In the context of the comic books, Sinister is a geneticist obsessed with creating the perfect mutant, his experiments leading to the creation of several, highly powerful mutants, such as: Madelyne Pryor, Cable and Nate Grey, all of whom are based off of Jean Grey's and Cyclops's genetic material.
- Mister Sinister also commanded a mutant hate group, The Marauders, whose members included: Sabretooth, Arclight, Riptide and Gambit.
- In the X-Men comics, Sinister was an ordinary human being living in Victorian-Era England until he awoke Apocalypse from his eternal sleep. Interested in Essex's experiments on mutants, Apocalypse granted the geneticist mutant powers through genetic modifications. Sinister would later sever his ties with Apocalypse due to conflicting interests, creating Cable as a weapon against the ageless mutant. Besides the non-canon X2: Wolverine's Revenge video game, it is currently unknown if the Essex Corporation has had any contact with Apocalypse.