Smurfs: The Runaway Rainbow Train

Plot
The Smurfs are preparing for the first rainbow train and are wrapping ribbons around lamp posts. Smurfete loves this time of year as it's all about rainbows. One of the ribbons attached flies away where Whistle Wishes catches it and arrives at the Crystal Carriage. While there, she and others hear a squeak and find out it's from a mouse inside one of the carriage's wheels. The unicorns decide to wash the carriage and get in a bubble fight before they're requested inside by Cheerilee. Rarity had a job to do so being late wasn't her fault and reveals that there were 63 ribbons out of 65. To sort things out, Whistle Wishes and Brights Brightly race off while Rarity is asked to stay behind and learn how to be a princess.