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.
Remi's substitute music class becomes the key to stopping a plot by Dongoros to use an icy Galactic Warrior to freeze everything.
A lying girl who claims to know Fiveman ends up being attacked by Zone, leading to Fumiya taking her to Magma Base for her own protection even with Ken's suspicions.
After a humiliating defeat at the hands of Garoa, Gaku decides to train for a rematch; leaving Ken to partake in a dangerous risk to deal with both Zone's commander and the demonic incarnation of the Sidon flower!
Remi supports a nosy photographer boy who tries to get a picture of a hard-to-catch cockroach Galactic Warrior eating all the food on Earth.
Doldora disguises herself as a girl named Midori who is interested in Fumiya as part of a Zone plot to break up the team's sibling bond.
Kazumi tries to teach a miserly boy named Hiroshi that there is more to life than money as she tries to deal with Dongoros' similarly greedy Galactic Warrior.
A mystery mecha arrives on Earth controlled by a wandering warrior aiming for FiveRobo; but the Fiveman realize that the machine may actually be connected to their parents!
Gaku pursues Gunther in hopes of finding out where he obtained his mecha from, as Zone tries to take advantage of the discord to crush both of their enemies.
Ken decides to prove the power of human effort in life and in battle to three failing gym students who ask for his help in dealing with the vaulting horse.
After falling against a powerful alien swordswoman who prides her solo nature, Kazumi meets a man named Koji Yuki performing research to bring life to the dead of the Earth.
After Fumiya creates a Fiveman puppet squadron with students, Dongoros decides to use these new toys to attack and hurt the actual Fiveman.
A loser Batzler ninja being trained by his master finds sympathy with Fiveman when Remi tries to protect him from his overworking leader.
Fiveman head to Kyushu to stop a Galactic Warrior raining down meteors to activate a dormant volcano as they're joined by an unexpected partner associated with their enemy.
On a special "Upside-Down Day" for Zone, Garoa is forced under the servitude of those typically under him to defeat Fiveman as they relax in and around Kyushu.
Doldora summons a Galactic Warrior assassin who attacks Fiveman in their dreams, with their damage taken being felt in the real world.
Fiveman faces a new challenge when Vulgyre's original commander leads a musical assault against them, charming them while destroying their mecha!
Garoa activates a desperate measure of fusing together Galactic Warriors for taking down Fiveman's Magma Base in order to prove his capabilities to Meadow against Chevalier.
While Chevalier continues to prove his superiority to both Fiveman and Garoa, Ken tries to use a children's game to discover a means to improve Fiveman's arsenal.
After witnessing a dream of her, Remi encounters the Hoshikawa's mother once again, unknowing of this being associated with a Zone trap.
When Chevalier launches an attack that ultimately kills FiveRed, Kazumi goes forth with a dangerous move in order to attempt to defeat the time-manipulating Combined Galactic Warrior behind his fall.
With only a final chance before being punished by Meadow, Garoa tries to create the ultimate Combined Galactic Warrior, but becomes plagued by its bizarre nature and in the means by how Fiveman deals with it.
In celebration of becoming Zone's lead commander again, Chevalier uses a Combined Galactic Warrior to collect humans to can for a feast, which includes members of Fiveman!
The Hoshikawa siblings lose confidence in their eldest brother Gaku when he decides to keep an important secret of their childhood from them.
A Combined Galactic Warrior switches the minds and bodies of the Hoshikawa twins, forcing Fumiya and Remi to work together in order to overcome their difficulty.
Ken's cynicism for Gaku's development of a new power up is put to the test when an unstoppable Combined Galactic Warrior crushes the team with its unbreakable defense.
The Zone commanders trick a school into believing they are the Hoshikawa siblings and to let them be teachers so they can dig up a powerful weapon for their arsenal which Fumiya tries to stop.
A female warrior saved by Billion comes to Earth to help him defeat Fiveman under the condition that he takes her as his lover.
A demonic sword summoned to Earth by Billion falls in the hands of Gaku's kendo student desiring to become strong like his teacher.
Doldora uses a Combined Galactic Warrior to become Kazumi's dream boyfriend in order to reduce her responsible nature towards her siblings.
Remi must prove that she can stand on her own when her Fiveman powers are taken by a Combined Galactic Warrior using them to empower the Gingaman.
A boy who watches too much TV becomes trapped when Dongoros transforms his set into a living being who just wants him to keep watching it!
On the day Newtown Elementary School is to reopen and the Hoshikawa siblings to return to being teachers, Garoa decides to pull a desperate move in order to regain the captaincy of Vulgyre from Chevalier!
Rushing into the Enemy Base Chevalier's attempt to one-up Garoa leads to a showdown where Fiveman faces their toughest opponent yet, encounter a returning ally and where Gaku makes a horrifying discovery regarding Zone's ultimate weapon.
As the truth regarding Zone's true purpose slowly unfolds, Fiveman must protect the Sidon Flowers as they finally discover what happened to the parents they left behind.
Vulgyre begins its final transformation into its ultimate form, giving Fiveman two hours to defeat Zone hoping they have enough time to stop the emergence of the true super-beast.
Fiveman desperately try to finish off Vulgyre and save the galaxy, but the ultimate key to victory may be to discover a clue handed to them by someone precious...