This story is a sequel to The Pony Guard: Return of the Elements and the Roar
After defeating Nightmare Moon, the Mane Six and the Lion Guard team up where they protect the Pride Lands and Equestria together as the two worlds merge together.
To the Pride Lands end, the first and newly formed Pony Guard work embark on a series of adventures to maintain peace and protection throughout all of Equestria and the Pride Lands while spreading the magic of friendship.