Nebula is a fictional character appearing in American comic books published by Marvel Comics. Created by Roger Stern and John Buscema, the character first appeared in The Avengers #257 (July 1985). Nebula has appeared in various adaptations of the character in other media, including animated television series and video games. Karen Gillan portrays the character in the Marvel Cinematic Universe films Guardians of the Galaxy (2014), Guardians of the Galaxy Vol. 2 (2017), Avengers: Infinity War (2018), and Avengers: Endgame (2019).