The Little Engine That Could/My Little Pony

Cast

 * Tillie as Twilight Sparke (Both have names starting with "T")
 * Georgia as Applejack
 * Jill as Rarity
 * Grumpella as Rainbow Dash
 * Missy as Fluttershy
 * Koko (from Chuggington) as Pinkie Pie
 * Chip as Spike
 * The Big Wolf as Discord
 * Farnsworth as Prince Blueblood
 * Pete as Big Macintosh
 * Tower as Cranky Doodle Donkey
 * Doc as Shining Armor