Twilight has been fascinated with the new power she and her friends received; Rainbow Power, but as she continues to study it and attempt to tap into their newfound powers again, something... Odd happens.
Once upon a time, there was a very young filly named Twilight Sparkle who went to the beach and met a very young colt named Rex. They played in the sand, looking for sea shells. And found something neither of them expected.
Twilight accidentally turns her friends into foals - including her - and Pinkie has to take care of them all before they wreak havoc on SugarCube Corner.
When a new age spell is too powerful for Princess Twilight to handle, the Mane 6 find themselves as newborn foals again. Only this time they're all under the motherly guidance of Celestia and Luna.