Series creator Brian K. Vaughan pitched "Runaways" in 2003 as a part of Marvel's Tsunami imprint, the goal of which was to attract new readers, particularly young readers and the manga audience. Marvel editorial staff agreed to it immediately, prompting Wizard Magazine to name the series as "one of the best original concepts from Marvel in thirty years." The Tsunami imprint turned out to be unsuccessful, and the series ended at issue #18. After the series' sales in digests, Vaughan pitched the idea again to Marvel, who accepted it.