The episode begins with The Powerpuff Girls, and The Rowdyruff Boys fighting a liquid monster of some sort. They thought they defeated it but it ended up in their stomaches. They became sick for months. Buttercup could'nt take it and was dying but Butch and the girls helped her. Blossom figured out it was the monster. So they had no choice but to beat themselves up. That did'nt work so they all ate and ate that work the monster ended up disolved in the stomach and the day was saved.