Him is sick and tired of all the villains (including himself) failing in their never-ending plot to destroy the Powerpuff Girls, so he brings the Rowdyruff Boys back to life and stronger than ever.

Princess interrupts a battle between the Powerpuff Girls and the Rowdyruff Boys. She tries to join the Rowdyruff Boys but they reject her, so out of pity the girls let Princess become a Powerpuff Girl.

He is sick and tired of all the villains (including himself) failing in their never-ending plot to destroy the Powerpuff Girls, so he brings the Rowdyruff Boys back to life and stronger than ever.

When the Professor realizes that all his successful experiments are actually just accidents, he sets out to do something brilliant on purpose!

Buttercup feels left out when she realizes that she doesn't have any special powers like her sisters.