The "Ancient One" is a character from the Marvel Comics universe, primarily associated with the Doctor Strange storyline. This character is depicted as a powerful sorcerer and mentor to Stephen Strange, teaching him the ways of magic and the mystic arts. The Ancient One is often portrayed as wise and knowledgeable, guiding heroes in their battles against dark forces. In the Marvel Cinematic Universe, the Ancient One is portrayed by Tilda Swinton in the film "Doctor Strange." This version of the character emphasizes themes of enlightenment and the importance of understanding the balance between good and evil. The Ancient One plays a crucial role in shaping Doctor Strange's journey as a superhero.