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When Legion, the mentally unbalanced mutant son of Professor Charles Xavier and Gabrielle Haller, travelled back in time in an attempt to kill Magneto, he accidently killed Xavier instead, creating a splinter universe known as the Age of Apocalypse. In that reality, mutants became the dominant species of the planet. Apocalypse rose to power enslaved humanity.

Nathaniel Essex, a brilliant scientist and geneticist living in England in 1859, was one of the first men in the world to discover the mutant gene. He made it his life's work to create the perfect mutant. His work led him to be contacted by Apocalypse. En Sabah Nur transformed Essex into the mutate Sinister and brought him into servitude. Sinister was at Apocalypse's side when they witnessed the battle that killed Charles Xavier. It was the same day Apocalypse declared his war on humankind.

During these early days of his partnership with Apocalypse, Sinister adopted two brothers with exceptional mutant abilities. The Summers brothers, Alex and Scott, were the closest Essex had found to genetic perfection. Scott's genes were of particular interest to Sinister; he hoped to one day use them to create the most powerful mutant on the planet.

Sinister created, alongside his mad scientist partner, the Dark Beast, the process used to create Apocalypse's Infinite army. The two of them controlled the Pens, a mutant breeding and testing ground for their twisted genetic plans. He was crucial in enhancing members of Apocalypse's army and in carrying out his directive of survival of the fittest. He eventually discovered that the combined DNA of the captured X-Man Jean Grey and his adopted son, Scott Summers, would create a mutant stronger than any other, even Sinister's master Apocalypse. Sinister carried out his creation and hid the experiment, named Nate Grey (Sinister's X-Man), with a small traveling theatre troupe of mutants, the Outcasts. As time moved on and Apocalypse's rule became more fanatical, Sinister realized his vision of the future did not coincide with his master's.

Sinister betrayed Apocalypse revealing his master's plan to unleash a surprise attack on the humans in Europe, to Weapon X and Jean Grey. This move led to the Human High Council preparing a full-scale nuclear assault on Apocalypse's kingdom in America.

Sinister destroyed his hideout in the Statue of Apocalypse and all the secrets it held inside. He traveled the ruined countryside of America searching for Nate Grey; finding his "X-Man" in Kansas. Sinister infiltrated the group under the name Essex and became close with his young creation. His true identity was discovered by Nate's friend, Brute, who recognized Sinister from his time in Sinister's breeding pens. Sinister murdered Brute and Nate's mentor, Forge, in cold blood.

Nate found his murdered friends and became enraged, unleashing his full mutant powers on Sinister. As Nate walked away, Sinister fell to the ground and apparently died from massive internal injuries.

Powers

Sinister is a mutant with complete control over his body's molecular structure. He does not age or get sick and can recover from most wounds. He also has superhuman strength and an incredibly enhanced intellect.




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