20 years after their parents were killed by the Silver Imperial Army Zone, the five Hoshikawa siblings embrace their arrival on Earth as they begin their battle against them as Fiveman.

When Zone starts building a base for their mission to destroy Earth, Gaku tries to restrain his siblings from just charging in to take them down.

Billion summons his partner Galactic Warrior to Earth to possess a student of Gaku in order to prove his superior combination to Fiveman's leader.

Remi tries to turn a struggle into an advantage when she accidentally becomes drunk during a Zone scheme to turn all water into sake to make humanity helpless.

While trying to stop Dongoros's scheme to turn babies into Zone Monsters, twins Fumiya and Remi come across a wandering space egg trying to find its parents.

Doldora creates a Galactic Warrior that sucks away the will of people to work, discouraging a boy who admires his hard-working father and forcing Remi to help them out.

Dongoros bribes a giant alien to come to wreck Earth, only for Kazumi and Fumiya to discover it has other problems that it can't quite deal with.

Gaku answers the call of an alien captured by Zone needing rescue, while Billion uses its rescue attempt to lay a trap for FiveRed.

A mysterious new team appears to fight against Zone instead of Fiveman, hiding away the true purpose of their appearance to the public.

A warrior from an illustrious but destroyed planet comes to Earth to seek his revenge on Doldora, with Fumiya deciding to try and help him accomplish his goal.

Ken joins a former student in searching for a treasure he thinks will help buy a new school while Dongoros likewise searches for the same reward of riches.

When Arthur G6 gets wrecked while assisting in taking down a more powerful Galactic Warrior, it ends up in the hands of a boy who turns the Hoshikawa's robot into his new little brother.