There are two different teams in the game story, superheroes, including characters like Batman, Superman, and Wonderwoman (who in fact will be mentors to your character), and super villains, headed by Lex Luthor, Ra's al Ghul, and Joker.
Once you have your character, you can start exploring a large and vibrant world full of characters, both computer and human-played, and with hundreds of missions to complete. As you might expect from this kind of game, your character will gain experience and skill as you successfully complete those missions.
Graphically, DC Universe is outstanding. There's no doubt that we're talking about one of the free online games with the best graphics out there.
DC Universe is a great MMORPG which, thanks to its unique setting, ends up being much more enticing than the majority of similar titles. If you're tired of medieval and fantasy settings and are looking for something new, this may be the best option you've got.