"The Evolutionary War" was a comic book crossover which ran through most of the 1988 annuals published by Marvel Comics. Principal writers included Gerry Conway, Steve Englehart, Louise Simonson, Chris Claremont, and Steve Gerber. The storyline was the first of its kind. While there had been previous extended crossovers over multiple titles before it, "The Evolutionary War" was the first to take place exclusively in annuals. This format of crossover annuals was to be repeated by Marvel for the next four years, most notably with 1989's "Atlantis Attacks."