Green Lantern for DC Comics, and Buffy the Vampire Slayer Season Eight for Dark Horse Comics. From 2002 to 2008, Vaughan, who came to prefer writing his own characters, wrote the creator-owned monthly series Y: The Last Man, a post-apocalyptic science fiction series about the only man to survive the apparent simultaneous death of every male mammal on Earth. The series was published in sixty issues by Vertigo and collected in a series of ten paperback volumes (and later a series of five hardcover "Deluxe" volumes). The series received Eisner Awards in 2005 and 2008, and numerous other nominations. The film rights to the series were acquired by New Line Cinema. Vaughan wrote his own screenplay for the project, though it was reported in March 2012 that Matthew Federman and Stephen Scaia were in final negotiations to write their own version. In 2006, Vaughan published the graphic novel Pride of Baghdad, which centers on a group of lions who escape from an Iraqi zoo after the start of the Iraq War. The book was praised by IGN, who named it the Best Original Graphic Novel of 2006, calling it a "modern classic", lauding it for combining a tale of survival and family with a powerful analogy of war, and praising Vaughan for representing various viewpoints through the different lion characters. From 2004 to 2010 Vaughan wrote another creator-owned series, Ex Machina, a political thriller that depicts the life of Mitchell Hundred, a former superhero known as the Great Machine who, in the wake of his heroism during the September 11, 2001 attacks, is elected Mayor of New York City. The story is set during Hundred's term in office, and interwoven with flashbacks to his past as the Great Machine. Through this, the series explores both the political situations Hundred finds himself in, and the mysteries surrounding his superpowers. New Line Cinema purchased the film rights to the series in July 2005, and commissioned Vaughan to write one of the two commissioned scripts, which he was reported to be working on in 2007. Following the conclusion of Ex Machina in 2010, Vaughan reiterated his previous statement that he would concentrate on creator-owned work, saying, "I realized when I turned in this final Ex Machina script that it would be the first time I wasn't under some kind of deadline at Marvel or DC since 1996. That's a huge chunk of my