20 Most Powerful X-Men Villains Of All Time
2. Mr Sinister
The only person who finds the Summers brothers in any way interesting, Mr Sinister is a Victorian-era geneticist who is fascinated by the mutant gene, and has done tampering to his own DNA which has left him immortal and all-powerful, and for some reason with white skin, a weird red diamond on his forehead and an immovable soul patch.
Unshackled from the moral restraints of his peers and obsessed with Darwin's evolutionary theories, Nathaniel Essex experimented on mutants and himself, boosting his human form to superhuman levels thanks to messing with the insides of his unfortunate victims, including Apocalypse and a young Magneto during World War II.
An Alpha-Level Mutant, Mr Sinister can control every molecule of his body, allowing him to assume the form of any one he wishes, and in combination with his healing factor is unkillable. He can read minds and project his own thoughts into the minds of others within a radius of 250 miles. He's immortal. He can turn “off” other's superpowers. Fear him.