The League found a portal in which it leads to Equestria.

A new kid showed up at Canterlot High School. A guy that has a dark past and all that is known about him is the emblem that he wears.

A Navy Seal and his dog end up in Equestria after a H.A.L.O. jump goes horribly wrong and now has to deal problems in his new land and also his internal problems. All while trying to go home.