In the south of Equestria, a meteorite fell, containing a deadly green crystal. But then, a sign appeared in the sky, heralding the impending end of the world, foretold in such an ancient prophecy that even Celestia and Luna had forgotten about it…
Goes to convention as a CELL operative in a Nanosuit, buys the Predator Bow from a shaddy Merchant, and end up in Equestria. Yup, totally a normal day.