Ultimate Marvel is an imprint of comic books published by Marvel Comics, featuring reimagined and updated versions of the company's most popular superhero characters, including Iron Man, Spider-Man, Wolverine, the Hulk, Thor, Daredevil, the X-Men, the Avengers, and the Fantastic Four. The characters have new origins, freeing them from the sometimes convoluted back-histories of the original versions which were thought to turn off new readers unfamiliar with their extensive histories. The universe has been designated as "Earth-1610" within the Marvel Multiverse, which comprises an infinite amount of alternate universes.