Thomas, Twilight Sparkle and Barney's Great Adventure: The Movie is a Upcoming Thomas/MLP:FIM/Universal crossover created by Stuingtion and Hiatt Grey (the original director of this film).
Cody (Trevor Morgan), his sister Abby (Diana Rice), their best friend Marcella (Kyla Pratt), and their baby brother Fig are dropped off by their parents for a visit at their grandparents' farm. And then meet Thomas, Twilight, and their friends Cody gets hit in his face by a basketball by accident while Abby and Marcella laugh and rub a Barney doll in his face. Cody loses his patience and starts a game of "keep-away" by taking the Barney doll and runs off with it. The two girls go after Cody. He then hides the Barney doll in the shower in the bathroom and the girls catch up with him. Cody tells them to use their imagination and laughs when he thinks that it is not working. However, the doll comes to life and turns into Barney the purple dinosaur. Cody refuses to believe in Barney at first, claiming that imagination is just for kids and that "real dinosaurs don't talk and real dinosaurs don't laugh."
That night, Cody wishes for a real adventure for that summer, and to do something no one has done before. A shooting star deposits a large colorful egg in the barn which is discovered by Cody in the morning. Unknown to our heroes, Starscream sees this and flies to tell Megatron and the other Decepticons. Barney and the kids go to tell the grandparents about this, but Barney is distracted by Fig's crying. Grandma suggests to Abby and Marcella that they go see Mrs. Goldfinch. Cody finds Barney who has just changed Fig's wet diaper and takes him to see his grandparents. However, Abby and Marcella take Cody and Barney to see Mrs. Goldfinch, who tells them that the egg is a dream maker. Cody knocks the egg off the table which lands on a birdseed truck. The adventure begins when Barney and the others try to recover it through a parade (our heroes were chased by Decepticons in the chase, but where eventually killed). Barney's friend B.J. catches it when it almost lands on the ground and breaks. Barney and the gang chase the egg throughout a French restaurant, a circus, and fly through the sky on an airplane to continue their pursuit of the egg which is in a hot air balloon. All the while, Baby Bop is looking for her yellow "blankie." B.J. and Baby Bop arrive just in time to see the egg hatch.
After they return the egg to the barn, it finally hatches into a koala-like being named Twinken who shows everyone Abby's dream and then Barney's. Cody apologizes to Barney for being mean and admits that he thinks he's cool. Barney accepts his apology and tells Cody that he thinks he's cool too and the two share a hug. Then Princess Celestia shows up and grands Barney as a honorary member to Canterlot. Twinken shows everyone a magical fireworks display which lands in Barney's arms. Barney begins to sing "I Love You", and everyone else sings with him. Baby Bop gets sleepy, which prompts B.J. to decide that they are ready to go home. The film ends with Barney turning back into a doll with Twinken sitting right next to him.
- Dusty Crophopper, Blythe Baxter, Zoe Trent, Pepper Clark, Penny Ling, Vinnie Terrio, Sunil Nevla, Minka Mark, Russell Ferguson, Mitzi, Vanellope von Schweetz, Button Mash, Babs Seed, Optimus Prime, Bumblebee, Ironhide, Ratchet, Dino, Sideswipe and Wheelie guest star in this film.
- Princess Celestia will appear at the end the film.
- Both Thomas and Friends and Barney were made by Hit Entertainment
- It's revealed that Pinkie Pie and Barney are old friends.