Equestria is under attack by the latest yearly threat. There's only one pony who can stop it. Unfortunately, that pony is you. Good luck, soldier. You're gonna need it.
(A CoD: Ghosts Extinction Crossover.) After activating the Medusa device, Godfather's Rapid Reaction Force wake up in a place that is not San Diego. With no Cryptids for once, but there's something odd about this place...