Ultra Galaxy Mega Monster Battle (ウルトラギャラクシー大怪獣バトル,Urutora Gyarakushī Daikaijū Batoru) is a Japanese tokusatsu drama in Tsuburaya's Ultra Series. Together with its sequels, they are the 23rd series overall. This series started on December 1, 2007.
Thousands of years have passed since the events of Ultraman Mebius. The organization known as Zata Astromical Pioneers (alternatively known as ZAP) has been founded and acts as a freighter transportation group across the galaxy. One of its branches, the ZAP SPACY and its crew are tasked with a mission to the research planet known as "Boris" to rendezvous with its crew (whom have gone missing.) Upon arriving though, the ZAP SPACY becomes stranded on the planet due to a SpaceTime wave causing their ship to crash-land, where they learn that all human life on the planet has been wiped out by a monster apocalypse.
While learning what's become of Boris, the team soon meets a mysterious youth named "Rei," who shows that he has the ability to control monsters when he uses his monster Gomora to fend off a Red King that was attacking the ZAP SPACY. Rei however is also suffering from amnesia, with the only memories he possesses being of a giant that's trapped within a mountainside. With a common enemy and wanting to escape from the planet, The ZAP SPACY and Rei join forces to fend off the monsters that now inhabit Boris. Along the way, the team meets a mysterious woman who appears to know more about Rei than he knows about himself, as well as a malicious black robot who's trying to hunt them down. Rei and the ZAP SPACY must now learn to work together if they are to survive in a dangerous world unlike the one they once knew, all while trying to unravel the mysteries to the monsters' appearance, as well as Rei's past.
In addition to all the episodes in the series, an end segment of the episodes known as "Mega Monster Battle File" features Oki and Kumano showcasing the Monsters of their respective episodes (as the bandai toys to represent them) being displayed while tidbits of the Monsters are explained as well as Oki and Kumano's personal experiences with the Monsters.
Oki shows off Gomora's signature ability, the Super Oscillatory Ray, while telling Kumano that he will be teaching all he knows about Monsters, to Kumano's bewilderment.
Oki shows off how Litra gained his new Fire Powers thanks to Rei saving it from dying, while Kumano breaks the 4th wall by contemplating how Rei's Battle Nizer works, to Oki's confusion.
Oki shows off Bemstar's ability to absorb energy through its Gorge (as well as reminiscing when it devoured a whole Space Station,) while Kumano congratulates a flattered Oki for helping them take the Monster down.
Oki shows off Twintail's whips, as well as its past history with the Monster, Gudon, only for him and Kumano to argue over how both of them are compared to the two monsters.
Oki shows off Eleking's Electrical abilities, while Kumano expresses interest in using Eleking for future engineering, causing Oki to eagerly go fetch Rei.
Oki explains Zoa Muruchi's aquatic nature due to the Alien Mates involvement with the Monster, while Kumano re-enforces that there is a difference between a normal Muruchi and Zoa Muruchi.
Oki explains Zetton's powerful abilities, as well as his past victory over the orignal Ultraman, while ending on him and Kumano asking the viewers to cheer them on for the upcoming battle.
Oki praises Ultraman for his past victories against Earth's Monsters, while Kumano questions him on whether he wants to meet him or not (as the last episode was next.)