The Mane Six hop a balloon for Hope Hollow, where Rainbow Dash has been invited to be the guest of honor at the town's Rainbow Festival. The place sounds magical, with amenities like a spa for Rarity to relax in and a butterfly garden for Fluttershy to enjoy. But when the M6 crash-land in town, there's no pony there to greet them. No spa, no garden, and no Rainbow Festival!
The mystery grows when the sun rises to reveal the entire town and the ponies in it have been drained of color! According to Mayor Sunny Skies, the hues disappeared at the end of the last festival, and he's convinced it's all his fault that's why he reached out to Rainbow Dash and her friends for help. While Twilight tries to discover what malicious magic caused the town to fade, her friends help the towns ponies plan a new rainbow festival, making friends along the way, and restoring the hope missing from Hope Hollow.