The Powerpuff Girls manage to defeat Mojo to which Blossom states that girls can actually prove themselves strong. To this, Mojo engages into a fight with the girls where the boys witness it. They find Mojo, lying to him that the girls had been the ones who had cause them trouble. Shortly, the boys throw rocks at the girls through any way possible. With that, he runs off leaving the boys in the hands of the girls themselves. Not too soon, the Powerpuff Girls Z see what is going on and they soon find Mojo where he reveals to them that it is really The Rowdyruff Boys causing all the trouble. They run off causing trouble throughout the city where the citizens attack Mojo, thinking he's responsible for this. After being born, or created they named themselves Brick,Boomer and Butch before calling themselves the Rowdyruff Boys and ran off, leaving Mojo.
They were then created with the item stolen from the professor's lab. They were first shown in ' The Rowdyruff Boys', where Mojo had sneaked into the Professor's Lab and stole the Chemical Z, momoko's bendy straw, kaoru's sock, and miyako's earwax cutips.
