Rainbow Dash and her friends had to run the town while Princess Celestia was on the holiday. Discord, along with his sidekicks, Diamond Tiara and Silver Spoon, is out to destory Princess Cadence. Sunset Shimmer from Canterlot High School has run of Sparkle. Now Rainbow Dash must save Princess Cadence and the Magic Town.
Rainbow Dash as Thomas
Fluttershy as Henry
Big Macintosh as Gordon
Rarity as James
Pinkie Pie as Percy
Applejack as Toby
Princess Cadence as Lady
Discord as Diesel 10
Diamond Tiara as Splatter
Silver Spoon as Dodge
Lotus Blossom as Annie
Aloe as Clarabel
Spike as Bertie
Thunderlane as Harold
Sunset Shimmer as Mr. Conductor
Rainbow Dash (EG) as Mr. Conductor Jr.
Sweetie Belle (EG) as Lily
Rarity (EG) as Stacy Jones
Sci-Twi as Burnett Stone
Big Macintosh (EG) as Billy Twofeathers
Apple Bloom (EG) as Patch
Applejack (EG) as Lily's Mother
Spike (EG) as Mutt
Filthy Rich (EG) as P.T. Boomer
Roxie as Henrietta (cameo)
Cranky Doodle Donkey as Cranky (cameo)
Apple Split as Butch (cameo)
Princess Celestia as Sir Topham Hatt (not seen)
Amira* as Lady Hatt (mentioned)
Garble as George (cut from movie)
Rainbow Dash: Oh Sunset Shimmer are you right?
Sunset Shimmer: Yes Rainbow Dash, but sometimes everything happens at once, I have to see Princess Celestia to get my orders right away. The journey from Canterlot High keeps getting bumper and bumper.
Rainbow Dash: Does it? (Sunset Shimmer blows her whistle) Discord is back Sunset Shimmer. You better be careful.
Rainbow Dash: Sir Topham Hatt warned me about Discord. Don't worry Rainbow Dash. I'll just pop in and out with my sparkle and whereever he goes and keep him in order. I hope.
Diamond Tiara: Uh, so boss . . .
Silver Spoon: How come you let twinklehoofs escape?
Diamond Tiara and Silver Spoon: Yeah?
Discord: Oh, that. Well, I did it on . . . purpose, y'know. I . . . was . . . testing her to see if she could escape.
Diamond Tiara: Liar, liar.
Silver Spoon: Pants on fire.
Diamond Tiara: Does he wear pants?
Silver Spoon: Well, training pants.
Diamond Tiara: Oh, yeah.
Discord: All right! Playtime's over, Diamond Tilver Spoon!
Diamond Tiara and Silver Spoon: Uh-oh.
Discord: Now it's time for the next lesson, huh?! I call it "How to Stop Being Stupid". (Discord hit the love fountain, pouring love all over him. J.C, Big Macintosh and Fluttershy laugh)
Discord: Uh, now that's gonna ruin my facial. (Diamond Tiara and Silver Spoon groans)