The character of Captain Comet was created by Julius Schwartz, John Broome and Carmine Infantino for use in DC Comics. His first appearance is in Strange Adventures #9 which was released in June, 1951. One notable fact is that Captain Comet was the first official superhero mutant in mainstream comic books. He appeared 12 years before the X-Men debuted, and Namor was only officially classified as a mutant during the X-Men's revival in the 1990s.