Nightmare Robin and Atomic Joker are the latest hero and villain to be added to the Infinite Crisis roster. Both are rather cool, especially Nightmare Robin.
No more "Golly gee, Batman" quotes from this guy. Oh no. He's out for blood. Literally.
As for Atomic Joker? Well, his diabolical head now rests in a preservation vessel attached to the back of a brute. You can guess the rest.
Infinite Crisis is the free-to-play MOBA from Turbine based in the DC Universe, and along with the new characters is a new tutorial mode where players are "coached by famed DC heroes". It also unlocks six free Champions as the player starts mastering the game more.
Infinite Crisis is still in open beta, and you can download it here.