When Waking nightmares charters meets All-stars and a pony name Meaghan tells pyro and Demo that the Flood of Equestira and Sea monster name 'Hydra' will eat Everypony whatever it's in 'It's' water unless All-stars, Mane 9 and Demo's and Pyro's Team Called 'Builders League United' or 'BLU' for short and all-star learn there are other All-Stars from other worlds
Crossover base on nintendo nut1's Night of The Were Ed: All Hallow's eve (I'm big fan of it), when Army of Zombies invaded Ponyvile, Twilight and friends meet 12 ponies that ARE from another world and Marine Pony from same world that 12 survivors are and he clams that there's a host of ancient crystals called 'Elements Of Survival' among them but will twilight find a way?