The mane six start having strange nightmares, but they decide to ignore them, until their dreams begin to affect them physically, mentally and socially. During the quest to find the answers to their problem, they discover the pony behind the nightmares is none other than Nightmare Moon, trying to find her way out of Luna, this time, decided she will not fail...

But she never imagined that the mane six would counter her with a taste her own medicine...