The sixth episode. The Powerpuff Girls ans The Rowdyruff Boys have fun but until....
The Powerpuff Girls and The Rowdyruff Boys go to the beach on a hot day of September. Bubbles and Boomer are building a sand castle together. Butch is over excited and spins around Buttercup while she giggles. Brick and Blossom are sun-bathing. Professor Utonium is so happy and tells all six of them to take pictures, for they're memory album. he takes several pictures of them, and they are having fun with each other.
That day, when a kid goes in the water, a monster made of water tries to harm the citzens. The Powerpuff Girls and The Rowdyruff Boys team up and try to defeat the monster, but unfortately, their powers and attacks are useless against the monsterous creature, so the two teams go to their house.
Back at their house, The Powerpuff Girls and The Rowdyruff Boys are in their bedroom. They are thinking of a plan to defeat the monsters, and that's when Butch sees out the window, the Water Monster is in Townsville flooding the City. So they are desprate what to do. Bubbles suggests to use the "power of love" to stop the monster, as she flirts with Boomer scratching him on his hair in a puppy dog way, making Boomer smile and blush. Brick says that's a stupid idea. Blossom kicks Brick for what he said. Butch is bore and says let's just defeat the monster. So they just head to town and fight the monster.
Boomer throws Bubbles at the monster, but still not enough. Brick uses lasereyes only making the monster multples. Butch decides to suck the water inside them. So they did, only resulting the water to taste terrible and making them spit all the water of the monster out of their mouths, as realizling the water taste naugthy. The Water Monster is developing the upper hand, causing The Powerpuff Girls and The Rowdyruff Boys to nearly give up, with Buttercup mostly regretting it. Blossom then thinks of a idea, using their new special move power. It is call Razzle Flames (very similar to The Powerpuff Girls move, Razzle Dazzle). They use the move together, a spinning fire move to use on The Water Monster to boil it. The move defeats the monster, and stopping the flood. The result of the move isn't pretty, as it makes both teams ditzy, saying they will never use that move again- unless for emergencies.
The Girls and Boys go back to the beach to have some fun in the sun. Brick, Blossom, Butch, and Buttercup are having a volleyball game, while Bubbles is cheering for them while Boomer are lifting her on his shoulders.
Professor Utonium (short cameo)