Doctor Strange

Doctor Strange (real name Stephen Strange) is the Sorcerer Supreme and the most powerful human sorcerer on Earth. He lives in his mansion, the Sanctum Sanctorum, which was cloaked by his magic.

Ultimate Spider-Man
When New York went under a powerful sleeping spell cast by Nightmare, Doctor Strange enlisted the help of Danny Rand, also known as Iron Fist. He questioned Iron Fist's choice in bringing Spider-Man with him. Doctor Strange explained to them that it was the work of Nightmare and claimed that faith had brought Spider-Man to be with them. Strange brought Spider-Man and Iron Fist to the Dream World to stop Nightmare. Doctor Strange fought against Nightmare, his horse Dreamstalker and his army of Dreamons, who overpowered him. For a while, Strange believed that he was too weak against Nightmare and lost his magical powers. He was convinced by Spider-Man that it was just a dream and regained his powers, and with the help of Spider-Man and Iron Fist, they sealed Nightmare in a magic box.

After they defeated him, Doctor Strange thanked Iron Fist and Spider-Man and reminded them to go back to Midtown High school before anyone figured out where they had gone.