Marvel counts among its characters such well-known properties as Spider-Man, the X-Men, the Fantastic Four, Iron Man, the Hulk, Thor, Captain America and Daredevil; antagonists such as the Green Goblin, Magneto, Doctor Doom, Galactus, and the Red Skull. Most of Marvel's fictional characters operate in a single reality known as the Marvel Universe, with locations that mirror real-life cities such as New York, Los Angeles and Chicago