DC Comics, Inc. is one of the largest and most successful companies operating in the market for American comic books and related media. It is the publishing unit of DC Entertainment, a company of Warner Bros. Entertainment, which itself is owned by Time Warner. DC Comics produces material featuring a large number of well-known characters, including Superman, Batman, Wonder Woman, Robin, Aquaman, Hawkman, Hawkwoman, Green Arrow, Black Canary, Cyborg, Martian Manhunter, Green Lantern and the Flash, along with superhero teams the Justice League and the Injustice Gang as well as antagonists such as Lex Luthor, the Joker, Bizarro, Captain Cold, Cheetah, the Riddler, Mr. Freeze, Catwoman, Sinestro, the Penguin, Poison Ivy, Two-Face, General Zod, Brainiac and Darkseid.