Takes place after the Beginning of The End
A mysterious alicorn named dubbed 'The Arkham Knight' takes full control of the Legion of Doom while the Legion are having suspicions about their new leader.Thinking that Grogar ditched them and used him as a replacement.
Meanwhile,Twilight isn't ready to rule.
I wish there was a LEGO minifigure of Arkham Knight.
it's the Joker in the aromor isn't it?