Ed Boon, creative director at NetherRealm Studios, tweeted the following screenshot from Injustice: Gods Among Us:
The image shows Killer Croc as well as the Riddler and Penguin. Unfortunately it’s not clear whether these characters will be playable or simply appear in-story. Croc looks like he might be a playable character, but the Riddler and Penguin may just be part of a stage backdrop, or part of the story but not playable.
One slight clarification: the versions of the villains are those of the Rocksteady’s Arkham universe. Neat move for Warner Bros. unifying the DC games’ lore. Love it.
Injustice: Gods Among Us is due on PlayStation 3, Wii U and Xbox 360 on April 19th.
Down below the enlarged image from the tweet to check all the details: