During 'The Cutie Re-Mark' as Starlight attempts to change time, something goes horribly wrong. There's a bright flash and a shockwave. Spike is stranded in the past and Twilight is missing. Now the future is changing in a way that nopony predicted.
Equestria Girls 'verse. Meet Flash Sentry and some of his friends at Canterlot High. They're Sunset Shimmer's only hope after she makes her escape from Equestria and finds herself in a strange new reality.