Assume for a moment that we exist in the other Equestria.
Assume also, that the name of Dusk Shine's sister is Cadance and that Shining Armor is the nephew destined to wed her.
Assume that the mastermind behind the evil plot is King Metamorphosis.
Assume that I have no idea what I was doing while writing this and you'll be fine.

...

I mostly just typed it up for the songs.
Main character tag is other because I think of Twilight and her friends as separate ponies from Dusk Shine and his posse.

Edit: Chapter 2 is slightly more "correct". Though, I'm probably still going to receive hate for this.