Crossover with Gatchaman II. As Gel Sadra is dying, her mother appears to her and tells her that part of Sosai X has escaped to another world, and she agrees to seek her redemption by going to that world to help that world's champions defeat the creature who destroyed her life and made her a monster.

Meanwhile, Discord is monitoring Equestria for a dimensional incursion...

(Just to be absolutely clear, this is not Displaced. The human crossover character is herself, not someone who was cosplaying as her and got turned into her.)