Onslaught is a character appearing in American comic books published by Marvel Comics. Created by writers Scott Lobdell and Mark Waid, and artist Andy Kubert, he first appeared in 1996 as a cameo in X-Men: Prime #1 before making his first full appearance in X-Men vol. 2, #53, where he would eventually serve as the main antagonist of the "Onslaught" storyline from then onward.