Having appeared as "guest stars" and "extra added attractions" in such previous animated series as The Superman/Aquaman Hour of Adventure, DC comics' legendary superhero team The Justice League was awarded its own starring series on November 17, 2001, courtesy of Warner Bros. Television Animation and The Cartoon Network. Though its personnel fluctuated throughout its comic-book run, for TV purposes the celebrated League was comprised of such familiar A-list crime fighters included Batman, Superman, Wonder Woman, the Green Lantern, Hawkgirl, the Flash, and a character that had never previously headlined a cartoon program: J'onn J'onnz, aka the Martian Manhunter. Initially summoned to Batman's orbiting space station to do battle against a battalion of extraterrestrial invaders (spearheaded by a U.S. senator who turned out to be an alien in disguise), the various members of the League, accustomed to working solo, were forced not only to adopt a "team" mentality, but also to put aside their various philosophical differences and personality conflicts -- which sometimes was more difficult than battling villains! For its third season on Cartoon Network, the series' title was changed to Justice League Unlimited, in honor of the many additional DC "specialist" superheroes who freelanced for the organization. The League itself was now under the guidance of the Martian Manhunter, who organized the various and sundry do-gooders into command teams, sending them off to jobs uniquely suited for their individual talents. Several half-hour episodes of both Justice League and Justice League Unlimited have been bundled together thematically for DVD release.