Thomas and Twilight Sparkle's Adventures of Star Wars Episode IX is the ninth and final upcoming Thomas/MLP/Star Wars crossover to be made by Hiatt Grey. And is the sequel to Thomas and Twilight Sparkle's Adventures of Star Wars Episode VIII: The Last Jedi.
- Princess Celestia, Princess Luna, Barret Barricade, Princess Skyla, Moon Starlight, Princess Sharon, Knockout, Puffer, Dolphy, Rachel, Mighty Joe, Jenny, Pete, Kevin, Morley, Blitzer, Dile, Shinji, Skarloey, Rheneas, Sir Handel, Peter Sam, Rusty, Duncan, Team Griffin/Eeveelution, The Griffin Family, Vinny Griffin, Glenn Quagmire, Cleveland Brown, Joe Swanson, Belle, Ariel, Princess Jasmine, Kida Nedakh, Judy Hopps, Nick Wilde, Joy, Sadness, Anger, Fear, Disgust, Lady, Duck, Oliver, Toad, Donald and Douglas, Stepney, Daisy, Ashima, July, Selena, Breon, Alan, Zecora, Button Mash, Daring Do, Moon Dancer, Minuette, Lemon Hearts,Twinkleshine, Maud Pie, Limestone Pie, Marble Pie, Coco Pommel, Cheese Sandwich, Big McIntosh, Babs Seed, Princess Ember, Gabby, Shrek, Donkey, Puss in Boots, Princess Fiona, Gingy, Pinocchio, Big Bad Wolf, Three Little Pigs, Three Blind Mice, Dragon, Wilbur, Cardigan, Templeton, Joy, Aranea, Nellie, Little Bear, Duck, Cat, Owl, Hen, Emily, Lucy, Doug Funnie, Skeeter Valentine, Natsu Dragneel, Lucy Heartfilia, Erza Scarlet, Gray Fullbuster, Wendy Marvell, Happy, Carla, Ellen Ripley, John Rambo, Optimus Prime, Bumblebee, Ironhide, Ratchet, Jazz, Sideswipe, Dino, Skids & Mudflap, the Wreakers, Wheelie, Brains, Cross-Hairs, Drift, Hound, Hot Rod, The Dinobots, and Dragonstorm guest star in this film.
- Alter, Samantha and Slate, Diesel 10, Splatter and Dodge, Diesel, Diamond Tiara, Silver Spoon, Starlight Glimmer, Suri Polomare, Trixie, Queen Chrysalis, Nightmare Moon, King Sombra, Sailor John, Timothy the Ghost Engine, Alfred the Loaned B12 engine, Quintessa, The Fallen, Sentinel Prime, Megatron, Starscream, Shockwave, Soundwave, Barricade, Lockdown, Gaston, Commander Rourke, Helga Sinclair, and Dawn Bellwether will work for Kylo Ren in this film.
- Flurry Heart will be born in this film.
- Spitfire and the Wonderbolts will make climax appearances in this film.