Nebula is a fictional character, an alien supervillain appearing in the Marvel Comics universe. Created by Roger Stern and John Buscema, the character first appeared in Avengers #257 (July 1985). A pirate and mercenary operating in outer space, the character has frequently appeared as an enemy of the Avengers and the Silver Surfer.Nebula has appeared in several other media adaptations of the Marvel comics, including animated television series and video games.