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The League of Extraordinary Gentlemen is a comic book series written by Alan Moor, who you might recognize from the writing of Watchmen and V for Vendetta. The original concept behind the comic book series was for it to be the "Justice League of Victorian England," although the comic quickly became a vehicle to bring in several works of fiction into one world. The first volume became the basis for the 2003 adaptation starring Sean Connery (which flopped at the box office).
In volume III of the comic, Harry Potter was scarred by a villain called Oliver Haddo with the mark of the beast to become the antichrist (!). His adventures were set up to fulfill that purpose. This drove Harry insane to the point that he killed every student in Hogwarts! As it turns out, Oliver Haddo had possessed Voldemort and is eventually beheaded by Harry, who keeps his head in a cage.
