DC Comics is one of the largest and oldest American comic book companies, with their first comic under the DC banner being published in 1937. The majority of its publications take place within the fictional DC Universe and feature numerous culturally iconic heroic characters, such as Superman, Batman, Wonder Woman, Green Lantern, the Flash, and Aquaman; as well as famous fictional teams including the Justice League, the Justice Society of America, the Teen Titans, and the Suicide Squad. The universe also features an assortment of well-known supervillains such as the Joker, Lex Luthor, Deathstroke, the Reverse-Flash, Brainiac, and Darkseid. The company has published non-DC Universe-related material, including Watchmen, V for Vendetta, Fables and many titles under their alternative imprint Vertigo and now DC Black Label.