As the Games begin, magic randomly pops up during pep rallies, and costume changes. The Doctor plays judge, Twilight's old friend Moondancer on her for changing schools, while portals to other places open up, and everything turns chaotic.
While all this take place, a darkness is growing, eating both teams from the inside out. And, as the Friendship Games progress a plot emerges from the dark, and the Doctor is trapped between doing the right thing, or losing everyone he loves.

'Alternate Timeline' tag for various changes in the timeline.