Dormammu is a Marvel Comics villain and an enemy of Dr. Strange.
Dormammu is first mentioned by Karl Amadeus Mordo, senior apprentice of the "Sorcerer Supreme" the "Ancient One", who, in the entity's service, attempts to slowly weaken the sorcerer, but is stopped when his fellow pupil Stephen Strange (Doctor Strange) manages to alert his master to the betrayal. Dormammu is a member of the Faltine, a race of powerful beings composed of pure magical energy who hail from another dimension. After he and his sister, Umar, killed their parent, Sinifer, they fled their native dimension to avoid retribution. They ended up in the Dark Dimension, took humanoid form, and after acting as advisors to its ruler, seized the throne after his death, with his son Orini becoming one of Dormammu's most loyal disciples (and Umar's lover). Dormammu took on a new form, one that blended his Faltine flames with his humanoid shape. He would later exile Umar, fearing (correctly) that she was planning to do the same to him.