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After her defeat in Ponyville, Trixie accidently wanders into a cave with a Ursa Major. When she wakes the next day she finds herself adopted by the Beast. To make matters worse she eventually learns that her body is morphing into a Ursa Minor.
On the eve of Nightmare Moon's return three royal guards were transformed into toddlers. Celestia now has to raise these three foals and keep them in line.