
Also in 2009, he became involved with Top Cow, writing each of the Pilot Season's five one-shots. In 2009 he became the writer of the six-issue limited series Image United, which was collaborated on by six of the seven original founders of Image, and has since faced some major issues in production time. In 2008 he was elevated to the role of partner in Image Comics, effectively ending his freelance role with Marvel, though he acted as producer for The Destroyer's miniseries, which was released under a Marvel imprint, the following year In 2007 he started collaborations with Rob Liefeld and Todd McFarlane, on Killraven and Haunt, respectively. He also maintained his position with Image comics, creating The Astounding Wolf-Man and editing Brit. He remained with Marvel, however, and worked on a number of different projects, including Captain America during Avengers Disassembled, Marvel Knights 2099, several issues of Jubilee and Fantastic Four: Foes, Ultimate X-Men, Marvel Team-Up Volume 3, Marvel Zombies and Irredeemable Ant-Man. In 2004 Kirkman was hired by Marvel, who put him to work on a revival of Sleepwalker, though his issues didn't see individual print, instead appearing later in an anthology series. In 2003, Kirkman and occasional collaborator Tony Moore created The Walking Dead, though Moore later left after struggling to keep up with deadlines.

A year later he and Cory Walker, who had previously worked with Kirkman on SuperPatriot, created Invincible, a new superhero series that was optioned as a film three years later, with Kirkman slated to write the screenplay.

Shortly afterwards, he was hired to work on Image's SuperPatriot miniseries, before moving on to create the Tech Jacket series, also with Image, in 2002. Robert Kirkman got his start in comics in 2000, when he created the independent parody series Battle Pope, along with childhood friend and artist Tony Moore.
