Following their announcement, Princess Celestia and Princess Luna decide to have their last Summer Sun Festival, and who better than Twilight Sparkle and her friends and the Power Rangers to help get ready for the holiday? Unfortunately, Blaze and Roxy’s Legion of Doom are also going to be there to crash the party, and make all the schedules to the festival a series of burnouts after another! The Rangers and Mane 6 must stop the Legion of Doom before they make things worse for the teams, and the holiday gets ruined. Will this festival be the last Summer Sun Festival ever? Not if the Rangers and Elements have anything to say about it!

Continuity:
Beast Morphers - It would most likely take place between Gorilla Art and Ranger Reveal, as Vargoyle will be making an appearance in the story, and he will join the Legion of Doom.
My Little Pony: Friendship is Magic - A rewrite of the season 9 episode, “The Summer Sun Setback”, so most of this will probably not be canon.

I don't own anything. MLP & Power Rangers are both owned by Hasbro.