My Little Pony Transformers: Mare In The Sun is a new movie.
Pinkie finds a retelling of the Nightmare Moon legend and it somehow swaps Princess Luna and Celestia's roles. Now, Celestia has become jealous and turned into the evil Solar Flare, who is bent on bathing Equestria in eternal daylight. And Starlight has become the princess of friendship and Twilight is her student. The Autobots and ponies must now find a way to defeat Solar Flare and reverse Celestia's and Luna's roles back to normal.