Thomas the Tank Engine Gets Frozen

Thomas and Twilight Sparkle Gets Frozen is a Thomas/MLPFIM/Disney crossover film to be created by 76859Thomas.

Plot
Elsa, princess of Arendelle, possesses cryokinetic powers, with which she is able to produce ice, frost, and snow at will. One night while playing with her younger sister, Anna, and their friends Thomas, Percy, James, Toby, Emily, Gordon, Henry, Edward, Bash, Dash, Ferdinand, Luke, Charlie, Hiro, Paxton, Victor, Kevin, Duck, Twilight Sparkle, Applejack, Pinkie Pie, Fluttershy, Rainbow Dash, Rarity, Spike, Apple Bloom, Sweetie Belle, Scootaloo, Shining Armor, Princess Cadence, Heckle and Jeckle, Cool McCool, Princess Irene, Turnip and Curdie (along with Stephen, Bill, Ben and Annoying Orange, Wrech-It-Ralph and their friends), she accidentally injures Anna. The king and queen seek help from the troll king, who heals Anna and removes her memories of Elsa's magic. The royal couple isolates the children in their castle until Elsa learns to control her powers. Afraid of hurting Anna again, Elsa spends most of her time alone in her room, causing a rift between the girls as they grow up. When the girls are teenagers, their parents die at sea during a storm.

When Elsa comes of age, the kingdom prepares for her coronation. Among the guests is the Duke of Weselton, who seeks to exploit Arendelle for profit. Excited to be allowed out of the castle again, Anna explores the town and meets Prince Hans of the Southern Isles, and the two immediately develop a mutual attraction. Despite Elsa's fear, her coronation goes off without incident. During the reception, Hans proposes and Anna hastily accepts. However, Elsa refuses to grant her blessing and forbids their sudden marriage. The sisters argue, culminating in the exposure of Elsa's abilities during an emotional outburst.

Panicking, Elsa flees the castle, while inadvertently unleashing an eternal winter on the kingdom. High in the nearby mountains, she casts off restraint, building herself a solitary ice palace, and unknowingly brings to life her and Anna's childhood snowman, Olaf.

Meanwhile, Anna, Thomas, Twilight and all their friends set out in search of Elsa, determined to return her to Arendelle, end the winter, and mend their relationship. While obtaining supplies, they meet iceman Kristoff and his reindeer Sven. She convinces Kristoff to guide her and the others up the North Mountain. The group  and our heroes then encounter Olaf, who leads them to Elsa's hideaway.

Anna and Elsa reunite, but Elsa still fears hurting her sister. When Anna persists in persuading her sister to return, Elsa becomes agitated and accidentally strikes Anna in the heart with her powers. Horrified, Elsa creates a giant snow creature to drive Anna, Kristoff, Olaf, Thomas, Twilight and the others away. As they flee, Kristoff notices Anna's hair is turning white, and deduces something is very wrong. He seeks help from the trolls, his adoptive family, who explain that Anna's heart has been frozen. Unless it is thawed by an "act of true love", she will become frozen solid forever. Believing that only Hans can save Anna, Kristoff races back with her to Arendelle.

Meanwhile, Hans, leading a search for Anna, reaches Elsa's palace. In the ensuing battle against the Duke's men, Elsa is knocked unconscious and imprisoned back at the kingdom. There, Hans pleads with her to undo the winter, but Elsa confesses she doesn't know how. When Anna reunites with Hans and begs him to kiss her to break the curse, Hans refuses and reveals that his true intention in marrying her was to seize control of Arendelle's throne. Leaving Anna to die, he charges Elsa with treason for her younger sister's apparent death.

Elsa escapes and heads out into the blizzard on the fjord. Olaf,  find Anna and reveal Kristoff is in love with her; they then escape onto the fjord to find him. Hans confronts Elsa and tells her Anna is dead because of her. In Elsa's despair, the storm suddenly ceases, giving Kristoff and Anna the chance to find each other. However Anna, seeing that Hans is about to kill Elsa, throws herself between the two just as she freezes solid, blocking Hans' attack.

As Elsa grieves for her sister, Anna begins to thaw, since her decision to sacrifice herself to save her sister constitutes an "act of true love". Realizing love is the key to controlling her powers, Elsa is able to thaw the kingdom and even helps Olaf survive in summer. Hans is sent back to the Southern Isles to face punishment for his crimes against the royal family of Arendelle, and Elsa cuts off trade with Weselton. Anna and Kristoff share a kiss, and the two sisters reconcile; Elsa promises never to shut the castle gates again.

Trivia

 * Stephen, Bill and Ben, Wreck-It Ralph, Vanellope von Schweetz, Fix-It Felix, Jr., Annoying Orange, Pear, Apple, Passion Fruit, Midget Apple, Marshmallow, Grapefruit and Grandpa Lemon are guest starring in this film.
 * Diesel 10, Devious Diesel, Discord, Queen Chrysalis, Team Galactic (Mars, Jupiter and Saturn), The College of Crooks (The Owl, The Rattler, Hurricane Harry, Jack-in-a-Box, Dr. Madcap and his wife Gtreta Ghoul) and Prince Froglip will be working with Hans.
 * Both Wreck-it Ralph and Frozen were made by Disney.
 * My Little Pony: Equestria Girls, Thomas & Friends: King of the Railway and Frozen were all released in 2013.