DC Universe

The DC Universe (DCU) is the fictional shared universe. This is where most stories in American comic book titles published by DC Comics take place. 
Heroes.
Superheroes such as Superman, Batman, Wonder Woman, Martian Manhunter, The Flash, Green Lantern, Aquaman, and Green Arrow are from this universe, as well as teams such as the Justice League and the Teen Titans. 
Villains.
DCU also contains well-known supervillains such as the Joker, Lex Luthor, Catwoman, Deathstroke, Reverse-Flash, Black Manta, the Penguin, the Riddler, the Scarecrow, Ra’s al Ghul, Sinestro, Brainiac, and Darkseid.