Previously, all Ponyville only on TV watched as the world absorbed the evil crabs. This alien from another planet, which in our atmosphere make the likeness of crabs. They do not have such a high-tech weapons and armor, but they win their battles in number. But then they got up to Ponyville and want to take over and the country. Rarity learned that the only weapon against the crab is spaghetti. Defeat the army of crabs.