(Set after season 2, before season 3)
Some times, evil doesn't want to spoil their chance of world domination. Some times, evil don't mind torturing or killing innocents to get what they want. There is a evil who wants to rule Equestria, and the Elements of Harmony has no effect on it. This evil has sent a team to handle them anyway.

(Had to edit the description, if you look closely you can see the half sentence change.)
(School gets in the way of a lot of things, sadly this is one of them.)