DC Comics, Inc. is an American comic book publisher. It is the publishing unit of DC Entertainment,a subsidiary of Warner Bros. Entertainment, Inc., a division of Time Warner. DC Comics is one of the largest and oldest American comic book companies, and produces material featuring numerous well-known heroic characters including Batman, Superman, Wonder Woman, Green Lantern, the Flash, Aquaman, Black Canary, Hawkman, Supergirl, Hawkgirl, Green Arrow, Martian Manhunter, Cyborg, Static, Zatanna, and Shazam. Most of their material takes place in the fictional DC Universe, which also features teams such as the Justice League, the Justice Society of America, the Suicide Squad, and the Teen Titans, and well-known villains such as the Joker, Lex Luthor, The Cheetah, Darkseid, Catwoman, Ra's al Ghul, Deathstroke, Reverse-Flash, Sinestro, Black Adam, and Brainiac. The company has also published non-DC Universe-related material, including Watchmen, V for Vendetta, and many titles under their alternative imprint Vertigo.