DC Comics, Inc. is an American comic book publisher. It is the publishing unit of DC Entertainment, a company of Warner Bros. Entertainment, which itself is owned by Time Warner. DC Comics is one of the largest and most successful companies operating in American comic books, and produces material featuring numerous well-known characters, including Superman, Batman, Wonder Woman, Green Lantern, the Flash, Aquaman, Shazam, Hawkman, and Green Arrow. The fictional DC universe also features teams such as the Justice League, the Justice Society and the Teen Titans; as well as well-known villains such as the Joker, Lex Luthor, Catwoman, Darkseid, Ra's al Ghul, Deathstroke, Sinestro, and Brainiac. The company has also published non-DC Universe-related material, including Watchmen, V for Vendetta and many titles under their alternative imprints Vertigo and America's Best Comics.