Mortal Kombat vs. DC Universe is a crossover fighting video game between Mortal Kombat and the DC Comics fictional universe. The game was released on November 16, 2008 and contains characters from both franchises. Its story was written by comic writers Jimmy Palmiotti and Justin Gray. Despite being a crossover, the game is considered to be the eighth installment in the main Mortal Kombat series. (Wikipedia.org)