Baron Karl Amadeus Mordo (known as Baron Mordo) is a character appearing in American comic books published by Marvel Comics, commonly as an adversary of Doctor Strange. The character was created by writer Stan Lee and artist Steve Ditko, and first appeared in Strange Tales #111 (August 1963). Baron Mordo is a gifted magician, especially adept in the black arts of magic, including summoning demons. Karl Mordo was studying the magic arts under the Ancient One in Tibet when Dr. Stephen Strange arrived. Strange foiled Mordo's plot to kill the Ancient One, leading to Mordo being cast out and Strange eventually becoming Sorcerer Supreme. Mordo has since clashed several times with Dr. Strange, at times with the backing of the demon Dormammu, briefly even impersonating Dr. Strange.[2] The Baron Mordo character has appeared in other forms of media, such as animated television series, films, and video games. Chiwetel Ejiofor portrays the character in the Marvel Cinematic Universe film Doctor Strange (2016)[3] and an alternate universe version in Doctor Strange in the Multiverse of Madness (2022).[4]