A girl named Robin wants to join the Powerpuff Girls squad, but she needs to prove herself somehow. She drank special super milk and became a giant girl in The Powerpuff Girls. However, gigantism is not the same thing as invulnerability. The hulk can be knocked down and defeated if you attack systematically and aggressively, which is what various monsters like Mojo Jojo or Princess Morbucks will do. You must help the heroine repel enemy attacks and thereby show that she can do something. The Powerpuff Girls will appreciate the contribution to their common cause of fighting the bad guys and will consider expanding their squad in The Powerpuff Girls.