2 – A new team formed by the reinstated Department H which is involved in clandestine and criminal activities. Morrison Era In 2000, Claremont returned to Marvel and was put back on the primary X-Men titles during the Revolution revamp. He was later removed from the titles in 2001 and created his spin-off series, X-Treme X-Men. X-Men had its title changed to New X-Men and writer Grant Morrison took over. The book is often referred to as the Morrison-era, due to the drastic changes they made, beginning with "E Is For Extinction", where a new villain, Cassandra Nova, destroys Genosha, killing sixteen million mutants. Morrison also brought reformed ex-villain Emma Frost into the primary X-Men team, and opened the doors of the school by having Xavier "out" himself to the public about being a mutant. The bright spandex costumes that had become iconic over the previous decades were replaced by black leather street clothes reminiscent of the uniforms of the X-Men films. Morrison also introduced Xorn, who would figure prominently in the climax of his run. Ultimate X-Men set in Marvel's revised imprint was also launched, while Chuck Austen began his controversial run on Uncanny X-Men. Several short-lived spin-offs and miniseries started featuring several X-Men in solo series, such as Emma Frost, Mystique, Cyclops, Iceman, Blink, Chamber, Mekanix (featuring Kitty Pryde), and Nightcrawler. Many of the second-tier X-books were relaunched with new titles: Cable became Soldier X and Deadpool became Agent X. A new series titled X-Statix spawns from and replaces X-Force; it is a series that explores the crossroads between heroism and being a celebrity, and how being a mutant is only acceptable as a medium of disposable entertainment. It was known best for being a series that killed most of the introduced cast and having one of the highest team turnover rates for a superhero comic. The most prominent member to come out of X-Statix was Doop who is a green glob reminiscent of Slimer from Ghost Busters. Another series, Exiles, started at the same time and concluded in December 2007 which led to New Exiles in January 2008 written by Claremont. Notable additions to the X-Men have been Emma Frost, Danielle Moonstar, Husk and Northstar while former villain Juggernaut became member of the X-Men. Notable story arcs of this era are "E Is For Extinction" (2001), "Planet X" and "Here Comes Tomorrow". X-Men New X-Men, vol. 1