The franchise even managed to bring Joker back in the latest game, and it turns out the characters work really well, provided they’re allowed to sink to the murderous depths of the Mortal Kombat universe.
Future Mortal Kombat games featured more appropriate characters for the universe, such as Jason Voorhees, Spawn, Leatherface and John Rambo.
While Mortal Kombat vs. DC Universe was not an example of these cameos at their best, it did open the doors to much greater collaborations between other franchises and the Mortal Kombat universe.