Once upon a time there was an alien fish, and he was trying to eat all the other fish.
But he just couldn't find any small sized fish, he could only see big fish, that's because it was Piranha Land.
Then he saw some so he ate them, because he was a piranha. But they swam away, to their home in a fish tank. Someone had put them in the water out of their fish tank.
It was William who had done it.