Full Version: Injustice 2 - Arkham Knight Refrence (SPOILERS)
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The Following Trivia Contains Spoilers for Batman: Arkham Knight

During one of the possible fight intro dialogues between Batman and The Joker, Batman will ask if Joker is a Scarecrow-induced allusion.

This is a reference to Batman: Arkham Knight, where The Joker appears as a hallucination that's triggered by Scarecrow's fear gas.