Apocalypse (En Sabah Nur) is a supervillian in the Marvel Comics Universe and one of the many enemies of the X-Men. Apocalypse was created by Louise Simonson and Jackson Guice and first fully appeared in X-Factor #6 published June 1986. Apocalypse is a virtually immortal mutant bonded with extraterrestrial technology.

Apocalypse is one of the most powerful mutants in the Marvel universe, possessing a multitude of superhuman abilities, including almost unsurpassed strength, invulnerability and the ability to both shift and alter his mass and form.

Apocalypse is most often accompanied by four servants, the Four Horsemen of Apocalypse, a nod to the Horsemen of the Book of Revelation. Apocalypse is the second earliest known mutant (the first being Selene), born in mid-30th century BC Egypt. After gaining his mutant power, he appears as a death god in several ancient mythologies. He has been most active in the late 20th and early 21st centuries AD when mutants have become a sizable part of the human population and Apocalypse see an opportunity to put into play his ultimate plan. He planned to implement his extreme Social Darwinist eugenic philosophy: only the fittest have the right to survive and he gets to choose who is fittest.