Twilight and Sunset Shimmer's Adventures in Frosty the Snowman

Twilight and Sunset Shimmer's Adventures in Frosty the Snowman is 2018 YouTube & Google Drive animated crossover film, starring Sci Twi (aka Twilight Sparkle) with Spike and Sunset Shimmer.

Plot
One December afternoon, a school girl named Karen  and her friends, along with Twilight Sparkle and Sunset Shimmer, create a snowman  after school. After several suggestions of what to call their snowman (including "Oatmeal" and " Christopher Columbus "), Karen decides to name him "Frosty." They later acquire a top hat discarded by inept magician Professor Hinkle. When Twilight places it on top of Frosty's head, the snowman comes to life (and always says "Happy Birthday!" in response). When Hinkle learns of the magic power his hat actually possesses, he takes it back and departs, pretending that he did not see Frosty come to life. However, the professor's pet rabbit, Hocus Pocus, returns the hat to Frosty.

Frosty soon senses the temperature is rising and worries about melting. The children suggest putting him on the next train to the North Pole, where he will never melt, and they all parade into the city on the way to the train station, where Frosty has his confrontation with the traffic cop  mentioned in the song's lyrics. When Karen and Sunset Shimmer both explain that Frosty came to life and doesn't know what a traffic light or a lamp post is, the traffic cop lets Frosty go. At the train station, Frosty stows away aboard a refrigerated train car, since neither he nor Twilight, Sunset and the children have any money for a train ticket. As the train is about to leave the station, Twilight, Sunset, Karen and Hocus decide to join Frosty for the ride to keep him company. With that, Frosty, Karen, Twilight, Sunset and Hocus wave goodbye to the other kids as the train takes off. Unbeknownst to them, Hinkle has also hitched a ride on the same train, intending to get his hat back.

As the train continues up north, Frosty, Twilight and Sunset notice Karen is freezing, despite all her winter clothing, so they jump off the train, leaving Hinkle behind once again. Hinkle, seeing them escape, jumps off the train too, but falls down a mountain and crashes into a tree where a pile of snow falls on him and a squirrel laughs at him. At Frosty's request, Hocus and Twilight's dog; Spike convince some forest animals that are preparing for Christmas to build a campfire for Karen. Fearing that Karen still cannot survive for long in the cold weather, Frosty asks Hocus who might be able to help them. Hocus suggests (by pantomiming) the President of the United States and the United States Marines, before Spike suggesting Santa Claus. Frosty agrees, and promptly takes credit for the idea himself (much to Hocus' annoyance except Spike). Hocus hops off to get Santa, but Hinkle then confronts Frosty and Karen once more and blows out Karen's campfire. Frosty, Twilight, Sunset and Karen are again forced to flee, this time with Karen riding on Frosty's back as he slides head-first down a hill while Sunset and Twilight uses a sled and followed them. At the bottom of the slope, Twilight, Sunset, Karen and Frosty discover a greenhouse filled with Christmas poinsettias. Despite Karen and Twilight's objections, Frosty steps inside the warm greenhouse with her, suggesting that he could afford to lose a little weight while she warms up. Unfortunately, Hinkle catches up to them immediately after and locks them in the greenhouse.

Hocus and Spike both bring Santa Claus to the greenhouse only to find Karen and Twilight in tears and Frosty melted on the floor due to Hinkle's cruel act. Santa explains to Karen, Twilight and Sunset that Frosty is made from Christmas snow, and that he can never completely disappear, only take the form of summer rain, until next December. With a gust of cold wind through the open greenhouse door, the puddle that was Frosty blows out the door and magically changes back into his typical snowman form. Before Santa can put the finishing touch on Frosty and bring him back to life, as Hocus and Spike arrive with the hat, Hinkle again arrives on the scene and again demands the return of his hat. He relents only when threatened with being removed from Santa's Christmas list for the rest of his life if he put so much as one finger on the hat. Santa states that if Hinkle is truly repentant for his mean attitude and harming Frosty, and if he goes home and writes "I am really sorry for what I did to Frosty" a hundred zillion times, he may find a gift in his stocking on Christmas morning, which makes Hinkle bid Frosty, Twilight, Sunset and Karen farewell and run home to repeatedly write his apologies, assuming he may get a new hat. Santa then places the magic hat back on top of Frosty's head and the snowman returns to life again. After celebrating, Santa takes Karen, Twilight, her dog Spike and Sunset home and Frosty to the North Pole, but promises that Frosty will be back next winter.

The end credits show all the characters the next Christmas marching through the town square with Frosty in the lead, singing the "Frosty the Snowman" song. Among them is Twilight, Sunset, their friends; Pinkie Pie, Rarity, Applejack, Fluttershy, Rainbow Dash, a traffic cop and a redeemed Professor Hinkle, who is proudly wearing his new top hat. At the end of the parade, Frosty gets back into Santa's waiting sleigh and they return to the North Pole, with Frosty proclaiming, "I'll be back on Christmas Day!"