Описание сериии:
All the children at Pokey Oaks Kindergarten love Ms. Keane, their teacher. But one day, Ms. Keane falls ill. A substitute teacher, a green-skinned humanoid monster named Mr. Green, is called to replace her for the day. Though he may look rather sinister and monstrous, he is proven to be a nice monster who loves children and enjoys teaching them.
When he first arrives, the Powerpuffs are cautious about him, and come to the conclusion that Mr. Green ate Ms. Keane. Many attempts to "foil" his "evil ways" fail, and their behavior only gets them time-outs.
While sitting inside as the other children are playing, the girls believe that they hear the other children screaming in fear. Taking action, the girls fly into space, performing a spinning attack, fusing into a blazing orb of energy. Luckily, the other kids catch them and successfully stop the girls from striking Mr. Green with their attack by crying out that he is a good guy.
After sheepishly landing, the girls receive a stern lesson from him, agreeing that it's wrong to judge people by their looks. Mr. Green hugs the girls, and they smile, finally trusting him.
