After the two groups meet up due to circumstances, Sonic and the Equestria Girls must team up to defeat an evil genius, who wants to use his power for world domination, while on the run from the government lead by a special agent.
Temporal amnesia? Check. Beautiful girlfriend? Check. New magic stuff over summer? Definitely! Check! ... Memories slowly returning? Like hell they are, the painful bastards! ... A cousin raised from another universe appears? Chec--... Wait... WHAT?!
When a concert rolls through, you just have to see it and The Rainbooms got lucky - they get a full backstage pass! But this time? Well, Starlight Glimmer's doppelganger turns up. And that's not the only surprise. Sunset's doppelganger does as well.
When you get involved in a car crash, nothing is usually supposed to happen to you, but for me, something happens and I struggle to comprehend it. I end up at Canterlot High. But There's one problem... I Have AMNESIA.