is a multimedia project of Tsuburaya Productions' long-running Ultra Series. The story's main setting took place in the mainstream Showa Universe (Ultraman to Ultraman Mebius) where monsters on Earth went extinct after 500 years had passed. Humanity at that time began to colonize the outer space area and an event called took place, where Alien Reiblood summoned Bullton and caused monsters and aliens from the Ultra Series multiverse to appear randomly.
The Mega Monster Battle multimedia work includes: Mega Monster Battle: Ultra Monsters (2007 - 2011) - A Data Cardass arcade game launched on April 27, 2007. It was succeeded by Ultra Monsters Neo and finally Mega Monster Battle RR before ceasing operation in 2011. Mega Monster Battle: Ultra Adventure (2008 - 2010) - A manga adaptation of the arcade game. The story took place 50 years after Ultra Galaxy Mega Monster Battle. Mega Monster Battle: Ultra Adventure Neo (2010 - N/a) - Sequel of the manga series, also adapted from Ultra Monsters. Mega Monster Battle: Ultra Coliseum - A Wii software game, taking place 25 years after Ultra Galaxy Mega Monster Battle. Ultra Galaxy Mega Monster Battle (2007-2008) - The 24th entry of Ultra Series, the series took place 50 years prior to Ultra Monsters and Ultra Adventure. Ultra Galaxy Mega Monster Battle: Never Ending Odyssey (2008-2009) - The 25th entry of Ultra Series, sequel of Ultra Galaxy Mega Monster Battle. Mega Monster Battle: Ultra Galaxy (2009) - Movie adaptation of Ultra Galaxy Mega Monster Battle. Ultra Galaxy Legend Side Story: Ultraman Zero vs. Darklops Zero (2010) - Side story adaptation of Mega Monster Battle: Ultra Galaxy. Ultraman Zero: The Revenge of Belial (2010) - Sequel of Mega Monster Battle: Ultra Galaxy. Ultraman Zero Side Story: Killer the Beatstar (2011) - Spin-off of The Revenge of Belial. Ultraman Saga (2012) Ultra Zero Fight (2012-2013) - Spin-off of Ultraman Saga.
Protagonists
Rei is a human Reionics, ZAP SPACY's latest member and the main protagonist of Ultra Galaxy Mega Monster Battle and its succeeding series, Ultra Galaxy Mega Monster Battle: Never Ending Odyssey. He was once a baby that appeared during Bullton's attack on Planet Boris. During the series, he first appeared after being trapped inside the carcass of a Peguila and in amnesiac state, appearing to be hostile towards ZAP SPACY members despite saving their ship, Space Pendragon, twice while only cares about recovering his forgotten background. In the end, after being persuaded by Hyuga, Rei decided to join ZAP SPACY. During his membership within the ZAP SPACY crew, he was haunted by the image of the giant buried in the rock and challenged by a mysterious woman named Kate. At the end of the series, after defeating Kate, he discovered the woman as his older sister and the buried giant is Ultraman, whom asked his help to free him. Rei as well had awakened his true potential as a Reionics, becoming a figure known as . During the second season, Rei participated into the Reionics Battle to determine the successor of Alien Reiblood to conquer the galaxy. Among them was Grande, an Alien Keel whom claimed to be his rival. Unlike the others, Rei on the other hand competed in the battle only to face Alien Reiblood, not wanting to inherit the latter's role as the ruler of the galaxy. In the middle of the series, he also encounter another giant, Ultraseven, which he rescued from Armored Darkness. After facing Alien Reiblood, he was finally brought to Earth for the first time. Sometime later in the movie, having recently finished Zaragas, Rei was spirited by Mebius, as he was predicted to be the chosen one capable of defeating Ultraman Belial. However, during the remaining Ultras' battle against Belial's army, he was corrupted by Belial into joining his legion until ZAP SPACY members awakened him from his senses. Followed by the arrival of Zero and the Leo Brothers, Rei was able to hijack Belial's Giga Battlenizer to ease the Ultra's battle, allowing Zero to finish him.
As a Reionics, Rei's initial monsters in his Battlenizer was Gomora, before he adopted Litra and Eleking during the series' progress. With other Reionics, Rei is subjected to the life-link rule with his monsters, thus would lose his life as well when one of them died in said battle, unless either Rei or his monsters sever their connections to save each other's lives. After Eleking's death by Grande's Tyrant, this caused Rei to succumb to his injuries until Kate upgraded his Battlenizer, allowing him to be on par with Grande's Tyrant. He was temporarily received Miclas by Ultraseven as a gratitude for saving him from the Armored Darkness until his final battle with Alien Reiblood. As Reimon, he is a mysterious alien who looks highly similar to Ultraman. He is the result of a fusion between an Alien Reiblood, and a human, Rei. When placed under extreme stress, he unleashes a , which also affects his Gomora. When in burst mode, his blue markings change to a crimson colour, black markings cross his body, and his eyes turn bright red. In this state, he becomes so powerful that he often loses his ability to tell his friends and enemies apart, but can be calmed back to his normal form with some effort. Reimon's attacks are the ray and a reviving ray, used to free and revive Ultraman. In the console game Ultra Coliseum, Reimon is capable of summoning a spectral version of himself to fight giant opponents. His finisher in the aforementioned game is , summoning EX Gomora to perform EX Super Oscillation Wave.
Rei's personal monsters are: : Rei's primary monster, Gomora is specialized in melee combat, such as the use of flying kick and its tail, . Its finisher attack is , originally a technique used by its brethren to burrow underground but can be used as a ranged beam attack. Another variation can also be performed, called where Gomora impales the target with its horn and fires the Oscillation Wave at point blank before throwing them aside. Gomora can also evolve through Rei's command in certain situations, but although facing against opponents that possess the combat knowledge of Gomora's evolved forms, said monster itself is still able to defeat them with some effort, either through both his and Rei's continuous combat experience or external forces. : Through Rei's command, Gomora can transform into EX Gomora, an evolved variation of itself. EX Gomora utilizes and a stronger attack called . : When Reimon undergoes a Burst Mode transformation, Gomora would also be affected by this, turning red. This Gomora retains its original attacks but utilizes a more cruel and brutish fighting skills. : Rei's secondary monster, Litra (S) was a native to the Planet Boris and had saved the ZAP SPACY crew from Juran by using the at the cost of her own life. Rei at that time manages to save her by absorbing her into his Battlenizer and healed her. During the battle, Litra (S) is capable of launching fireballs and utilizes mode to initiate flame-based attacks. : Rei's latest monster, which he acquired after Gomora defeated it in a battle that nearly puts the fate of Planet Boris at stake. Eleking is capable of using electric-based attacks and fights underwater. When needed, Eleking can also turn into a miniature version of itself, called , which was once used to fix the Pendragon's generator. Eleking in the end was killed by Grande's Tyrant, but although the rules of Reionics Battle stated that Rei were supposed to die as well, Eleking managed to sever their connection, saving Rei at the expense of its own life. This act allows Rei to progress further into the Reionics Battle and avenge Eleking's death by having Gomora killing Tyrant. Capsule Monster Miclas: See here.
Rei was portrayed by .
Io Mikura is the main protagonist of the Mega Monster Battle: Ultra Adventure manga and the Mega Monster Battle: Ultra Monsters arcade game. A young boy who was originally a student of the ZAP SPACY with affinity for monsters, Io's favorite food is chocolate and his shirt has Nexus' Energy Core symbol. He was somehow brought into the past where Planet Boris was still in a good condition and immediately became a Reionics due to picking up a Battlenizer. He has his mother's ATM card, through which he performs an unlikely friendship with Kanegon. His true identity in the story was revealed to be the grandson of Karen Mikura.
In Ultra Monsters, Io's Battlenizer monster is optional to the player's choice, based on their own preference of cards. In Ultra Adventure, Io's Battlenizer includes: Ancient Monster Gomora: A monster that Io mainly utilize in the battle. Gomora is portrayed as a prideful monster that usually doesn't get along with Io, but would ascend to the battlefield when needed. In Gomora's battle on Earth, the monster accidentally destroyed the Osaka Castle. Alongside Vittorio's EX Gomora, both monsters can perform a combination attack called , used to destroy Reiblood's Deathfacer. : A monster contained within Io's Battlenizer. It was originally a follower of Alien Reiblood, tricking Io to become a Reionics but defected at the last minute. Pigmon usually ended his sentence with the word "Piiii" and has the ability to detect monsters. In the game series Mega Monster Battle: Ultra Monsters, Pigmon is voiced by . : Originally a monster belonged to an Alien Hipporit, Bemular was adopted by Io as his third Battlenizer monster. Bemular rarely sent into the battle, as its energy sphere form was used by Io as a form of transportation. Bemular sacrificed itself to shield Io's party from being killed by the Reiblood-possessed Deathfacer.
Ai Asama is the main protagonist of the Mega Monster Battle: Ultra Adventure Neo manga and the Mega Monster Battle: Ultra Monsters Neo arcade game, both succeeding Io Mikura. He was a boy who lives in an alternate universe, which was soon revealed to be the same era of Ultraman Tiga. In a similar case to Io, he was also transported into the past after an incident involving Kyrieloid and Kanegon but instead of becoming a Reionics, he proves to be a better controller in guiding Kanegon's Red King when the latter has trouble over it. He befriended Kanegon in the later story after he was chased by several aliens that try to hunt his Battlenizer. At the end of the manga, he was officially recognized as a Reionics by Io, Vittorio and Kanegon, thus gaining his own Neo Battlenizer.
His mother works as a medical officer in the GUTS Dive Hangar
Kanegon is the supporting protagonist of Ultra Monsters game and manga series. He meets Io and befriended the boy for his possession of an ATM card. He appears as a minor character in the original manga but in the Neo installation, Kanegon runs away from a group of aliens that try to claim his Battlenizer without a payment. He bumped into Ai, where the boy proves to be a better controller of his Battlenizer, something Kanegon gas trouble controlling with. As the story progresses, they discovered that Reiblood was inhabiting their Battlenizer and collected their combat data in order to restore his strength and recreate Kate's Zetton (EX Zetton).
In Ultra Monsters, Kanegon/Ai's Battlenizer monster is optional to the player's choice, based on their own preference of cards. In Ultra Adventure, their Battlenizer includes: : Kanegon/Ai's main monster. This Red King also shows a comical side when Ai forced it to apologize to Ultraman Tiga after an accident. While Red King is stubborn towards Kanegon, it shows a complete cooperation when working for Ai. Most opponents tend to overlook Red King, ending up with several of them in humiliating defeat. Because of its partnering with Ai, Red King displays new attacks, such as explosions and drop kick. If fighting in full strength, Red King is strong enough to be on par with Vittorio's EX Gomora. Through Ai's sheer will Red King can transform into , possessing the ability to release extreme heats and counter opponents with cryokinetic abilities.