The turtles went on an adventure in another world called Equestria to saved it from the evil Kraangs, but for that, they needed to learn more about this new world, but luckily they meet the Mane 6.
Twilight Sparkle and Starlight Glimmer are engaged in a time travel battle and no matter what she tries, Twilight just can't get Starlight to stop altering the past. The battle is growing old for Starlight so she decides to end it once and for all.
April, YOH 1505: Twilight Sparkle and her Companions have returned to Ponyville from Our Town. Now they must deal with the emotional price of their incomplete victory.
Arpeggio Chord is a refugee, sent to Ponyville to live with a family until he can pay for a residence. He ends up living two with fellow musicians; one classical, and the other... not so much.
One Thousand years ago, the saints Celestia and Luna drew upon the power of the Red Stone of Aja to defeat the demon Discord. Now one thousand years later the Stone is destroyed, beginning the tale of six ponies and their quest to redeem the world.