Ultimate X-Men, a Marvel Comics series, has covered 19 story arcs since the first issue's debut in February 2001. Mark Millar wrote most of the first 33 issues, followed by Brian Michael Bendis for 12 issues, Brian K. Vaughan for 20 issues, and Robert Kirkman for 28 issues. Aron Eli Coleite, known for his work on the television series Heroes, took over the book for the remaining seven issues, concluding with his Requiem story.