Thomas the Tank Engine's Search For The Black Cauldron is another upcoming Thomas & Friends/Disney Crossover film to be made by 76859Thomas. It will appear on Google Drive in the near future.
On the small farm of Caer Dallben, Taran (whom Thomas, Percy, James, Toby, Emily, Gordon, Henry, Edward, Bash, Dash, Ferdinand, Twilight Sparkle, Applejack, Pinkie Pie, Fluttershy, Rainbow Dash, Rarity and Spike meet) is an Assistant Pigkeeper to the enchanter Dallben, with dreams of becoming a great warrior. However, he has to put the daydreaming aside when his charge, an oracular pig named Hen Wen is kidnapped by an evil lord known as the Horned King (whom are working with). The villain hopes Hen Wen will show him the way to The Black Cauldron, which has the power to create a legion of invincible undead warriors, (known as "The Cauldron Born"). With the aid of Princess Eilonwy an exaggerating middle-aged bard named Fflewddur Fflam and a pestering but ultimately loyal creature called Gurgi, Taran tries to save the world of Prydain from the Horned King. As the new friends face witches, fairies, magic swords, and the Cauldron itself, Taran starts to learn what being a hero really means and that some things are more important than glory.
- Diesel 10, Devious Diesel, Discord and Queen Chrysalis are guest starring in this film and will be working with The Horned King.
- Thomas and his friends will see Taran, Princess Eilonwy, Fflewddur Fflam, Gurgi and faced The Horned King and Creeper again in Pooh's Adventures of The Elm-Chanted Forest.
- This film directly ties into Pooh's Adventures of The Elm-Chanted Forest as Thomas, Twilight, Taran and their friends headed off to The Fantasy Forest where they met up with Pooh, Ash, Simba, Littlefoot, SpongeBob, Tai and their friends at the construction of The Beaver's home.