Prologue: Rat Invasion

Poland had a sleepover with Lithuania and the next day, Lithuania went missing. Poland called his and Lithuania's friend, Clara, to come and find him. She found a nutcracker, and gave it to Poland. However, little did Poland know that finding Lithuania will be an adventure that will change the world forever.

Disclaimer:
I do not own Hetalia, nor do I own Barbie in the Nutcracker. Hetalia and Barbie in the Nutcracker respectfully belong to Hidekaz Himaruya and the creator of Barbie respectively.