Injustice's whole deal as a story was that Superman had gone a bit screwy. The game actually spawned a whole new universe, and I assume Injustice 2 will
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This was confirmed by NetherRealms head Ed Boon.
This cast of characters really could be quite diverse and full of strange choices, which it already is in honesty The more out there and bizarre the characters, the better in my book.
I got to play a couple rounds of Injustice 2 at E3 this year, and[...]