After being returned to the proper timeline, Twilight Sparkle, her mind and soul became corrupted by the combination of the curse placed on her by Daybreaker and the tantabus implanted in her mind by Nightmare Moon, becoming something dark and twisted.

That same night screams of horrified mares echo across the land as they find their foals stolen by a dark alicorn.

Heeding the call of her former teacher, Sunset Shimmer, along with her six friends come to the land of Equestria to save the fallen princess.

Can the Humane seven, along with the remaining Mane Six, Starlight Glimmer and Princesses Celestia, Luna and Cadance save Princess Twilight or will a new dark queen rise to rule?

EDIT: Due to the limit of 5 main characters/character groups able to be tagged, Starlight Glimmer is also a main character.