I love the G1 special "Rescue at Midnight Castle", why couldn't all the specials/tv shows been like that? That was what I wanted to see as a kid.
God what I'd pay to see a longer, maybe 40 minute version with more characters and less sea ponies...
When adapting it into G4, I decided to actually make it a fictional story that is considered one of the great pieces of Equestrian literature. Written by a Hermming Ye-Haw, the story follows a young donkey named Megera who is called upon by the regular pony inhabitants of a small village when she seems to be the only one that can save them from Tirac, a gruesome Minataur/centaur that enslaves and transforms the ponies. She alone must unleash the ponies rainbow in order to defeat Tirac's Rainbow of Darkness (which coincidentally is also the name of a popular Heavy Metal group in Equestria).
Don't judge me for making a headcanon within a headcanon.