DC Universe Online is an MMO game set in the world of Batman and Superman. The game offers the player to become a completely new superhero or a supervillain.
The game's opening cinematic tells how the greatest heroes and villains of the DC Universe annihilated each other in a future war. This left the Earth defenseless before the space conqueror Brainiac. The only survivor of this war, Lex Luthor, claims he came back to the present to prevent this catastrophe. He created nano-robots that grant superhuman powers and released them on Earth to create new metahumans. As a result, thousands of people develop extraordinary abilities and become superheroes or supervillains. One of this people is the player's character.
Before entering the game, the player has to create his or her original, fully customizable DC character. The player can define the character's gender, looks, personality, powers, and other attributes, or to use pre-loaded templates. You also have to choose your side and decide if you're a hero or a villain.
The newly created character enters the DC Universe and immediately has to fight for his or her freedom as part of a tutorial mission. The player shares the world with thousands of other metahumans as well as AI-controlled famous heroes and villains from the DC Comics canon. All of them are involved in constant battles between good and bad. To become a member of Justice League or Secret Society of Super Villains, the character has to gain experience, complete quests and master his or her powers.