"Atlantis Attacks" was a comic book superhero crossover storyline which ran through most of the summer annuals published by Marvel Comics in 1989 and 2020. The storyline is a complicated, multi-layered crossover regarding the return of the seven-headed Elder God Set the Old Serpent at the hands of the various underwater empires of the Marvel Universe. The title is misleading, however, as Atlantis and its then-leader Attuma only play minor roles in the story as flunkies for the real masterminds: the Lemurians and their leader Llyra.