Previously on Powerpuff Girls Z A New World a new chemical was discovered called Chemical Z, it had the power greatly alter a person for better or worse, many thing were affected negatively by this chemical, three little girls and a robot dog were affected positively with this chemical. The girls were assigned to protect the world from monsters.

At the same time they encountered an alien race, a race of our very sun, with an imperialistic government. The first contact was with a very famous family of this alien race, they are famous for they're abilities that the other people do not. The youngest son of this family joined the girls fight against evil and he also became a very close friend with the girls and everyone they are in contact with.

The boy had introduced a new out of this world sport, they participated and met the other alien races, his team won first place, and the most mysterious and powerful race met with a woman who has foresight and saw a grim vision of the future. Unfortunately this glory was all at the expense of the life of the emperor. The Prime Minister was crowned new emperor.

When it was over, earth was threatened by demon. The four heroes traveled back in time and received tools and the legendary Excalibur from the past and defeated the menacing demon forever.

A boy who was the love interest of one of the girls became a monster from this chemical. The alien emperor heard about this chemical and became ill minded. He snuck soldiers to earth and kidnapped the boy.

Later the emperor arrived on earth and held the boy hostage and for the rest of the chemical as a ransom. But they refused and they then executed the boy right before they're very eyes. The empire had it's whole fleet armed with mass drivers and threatened to shoot earth with them.

The emperor was planning to use the chemical to supercharge himself and his military with this chemical so he can conquer the universe. He tried to use persuasive speech to get the heroes on his side but it didn't work.

They still refused and he called his soldiers to attack them, the heroes defeated the soldiers and felled one of the military leaders.

But as a last resort the emperor fled and commanded his ship to blast the heroes with a mass drive shot. They survived but now they are separated and hurt. Now the heroes know to take they're hero work more seriously.

The alien boy was hoping to build a bridge of peace for his people and humans, he made future promises to the girls. But now with these events these dreams won't happen.