Doctor Strange was created by Lee and Ditko, and his origin story shows that he was once an egotistical surgeon who got in a car accident that left him unable to perform surgery.
He searched the world for a way to repair his hands and stumbled upon the Ancient One, who made him a student of the mystic arts.
His suit, the Cloak of Levitation and the Eye of Agamotto, give him added powers, and he later took on the title of Sorcerer Supreme to help defend the world.
Although he's not quite as well-known as some of Lee's other superheroes, his 2016 stand-alone film and recent appearance in the "Avengers" movie franchise have increased his popularity.