[9][10] The first series, Ultra Galaxy Fight: New Generation Heroes (ウルトラギャラクシーファイト ニュージェネレーションヒーローズ, Urutora Gyarakushī Faito Nyū Jenerēshon Hīrōzu), aired from September 29 to December 22, 2019.

Due to Zero's failure in protecting Grigio and ended up within the Dark-Killer Zone, the Ultra Brothers summon Rosso and Blu to their headquarters but they fly away before Taro can provide enough explanation, leading to their encounter with Etelgar.

Orb, Geed and X stay behind to fight their copies, Ginga and Victory faced Lugiel and Etelgar in the Dark Palace as Rosso and Blu entered the Dark-Killer Zone, only to be ambushed by the namesake villain himself.

In an attempt to gain advantage against the New Generation Heroes, Tregear revived Zero Darkness and Dark-Killer (the latter enlarged to 200 meters) before escaping from Ribut and send the Red Kings as his distraction.

The rest of the New Generation Heroes chased after the rogue Ultra[2] as Zero sent Grigio back to her home world, wanting her to protect Ayaka City in her brothers' absence.

The second series, Ultra Galaxy Fight: The Absolute Conspiracy (ウルトラギャラクシーファイト 大いなる陰謀, Urutora Gyarakushī Faito Ōinaru Inbō), aired as a 10-episode format with the duration of 10 minutes per episode from November 22, 2020, to January 13, 2021.

[6][7][8] Prior to his membership in the Galaxy Rescue Force, Ribut was a civilization guardian alongside Ultraman Max and investigated the Planet Mikarito's sudden depletion of energy.

[11][12] Both incidents were reported to the Inter-Galactic Defense Force, where a rescue operation was held to create an antidote to save Max while Ribut undergoes training from Great and Powered.

[11][12] Zero had jumped into various dimensions to recruit Joneus and Grigio into his newly formed Ultra League, bringing along Ribut and Andro Melos by sending them to save the Tri-Squad.

The Ultra League arrived to further assist the battle and Zero try to exert his full power as Ultimate Shining Zero, but failed to intercept Tartarus in his pocket dimension Narak.

Absolute Tartarus revealed that he plans to use Yullian as a hostage to force the Ultras into surrendering the Land of Light for his people, Absolutian, to populate as their new home.

[20] The title is later announced to be Ultra Galaxy Fight: The Destined Crossroad (ウルトラギャラクシーファイト 運命の衝突, Urutora Gyarakushī Faito Unmei no Shōtotsu) during an online event.

The Tri-Squad decided to recruit the New Generation Heroes as part of the reformed Ultra League, only to find themselves assisting their seniors (including Z after his fight with Destrudos) in their hunt for the Devil Splinters, especially when Gina Spectre joins the fray to steal them.

At the same time, Abolute Titan was assigned to attack Ultraman Noa at Planet Babel, leading to a confrontation with the Ultra Force and eventually getting trapped into a Meta Field, wherein his cooperation with Ribut was used as a test by Nexus/Noa to confirm his believes that the two race can achieve a peaceful coexistence.

[46] Koichi Sakamoto stated that the production behind The Absolute Conspiracy was made in response to the popularity of New Generation Heroes, as well as the success of the English dubbing and its easier accessibility through YouTube on mobile devices.

Whereas the previous instalments had the appearance of a "festival", Sakamoto aimed for The Absolute Conspiracy for individual focus of different Ultras in their respective eras, hence the series' 10 episodes are separated and categorized into three chapters.

Sakamoto draws inspiration from Mamoru Uchiyama's The Ultraman manga series over its space opera theme, carrying it over from the 2009 movie Mega Monster Battle: Ultra Galaxy.

Inclusions of Ultraman 80, Great, Neos, Seven 21 and Max are due to their series celebrating their milestone anniversaries, while Powered, Cosmos and Justice were in hopes of further expanding their characters after their last live action appearances.

The Ultimate Wars, an event that was originally mentioned in episode 25 of Ultraman Taro, is expanded as part of Belial and Father of Ultra's past in their fight against Alien Empera.

[48][49] Ultraman Regulos: First Mission (ウルトラマンレグロス ファーストミッション, Urutoraman Regurosu Fāsuto Misshon) is an 18 minute spin-off sequel to The Destined Crossroad, chronicling on the events after the Ultras' fight against the Absolutians.

In it, Sora went into trouble during an investigation on Planet Maijii, while Regulos embarks on a rescue mission to live up to the true meaning of the Cosmo Beast emblems on his arms.