Rainbow Dash loves the time of year when Ponyville and Breezie Blossom are all about celebrating rainbows. Meanwhile in a new magical place called Unicornia, Rarity is being taught how to be a Unicorn Princess and the importance of making the first rainbow of the season. But she is quite a little rascal and embarks on an incredible ride, a huge adventure (with lots of mishaps) as she tries to get back to Unicornia. Rarity soon realizes that getting home in time to create the first rainbow of sea...