The mane six are back, and their greatest enemys have joined forces to take over the world! They know they can't defeat Discord, Nightmare Moon, Chrysalis, and their mystery leader, so they recruit some help in the form of the CMC, Derpy Hooves, the FlimFlam brothers, and a mysterious pony taking on the costume of The Mysterious Mare-Do-Well. Can these 13 ponies defeat 3 immortals and uncover their mysterious leader?