Marvel includes well-known superheroes such as Iron Man, Captain America, Hulk, Thor, Doctor Strange, Spider-Man, Deadpool, Wolverine, Daredevil, Ms. Marvel and Ant-Man, such teams as the Avengers, the Guardians of the Galaxy, the Inhumans, the Fantastic Four, and the X-Men, and antagonists such as Doctor Doom, Red Skull, Green Goblin, Thanos, Ultron, Doctor Octopus, Magneto, Venom and Loki. Most of Marvel's fictional characters operate in a single reality known as the Marvel Universe, with locations that mirror real-life cities.