Great Decisive Battle! The Super 8 Ultra Brothers
After Rena had made everyone remember their original hope, Gamu realized that his dream was to become a scientist along with Asuka, remembering his dream as well, causing their transformation items to appear on their hand and transforms into Dyna and Gaia. After being supported by the citizens, they proceed to free Tiga from the cylinder and defeat the last three monsters King Silvergon, King Goldras and Alien Super Hipporit.
However, the mysterious cloaked being and many other similar looking beings use their magic to revive the souls of the defeated monsters. The souls combine to form Giga Khimaira. The monster knocks down the three Ultras, however, their friends and the city continuously cheer them on and they rise up to right Giga Khimaira. Soon, Hayata, Dan, Go, and Seiji transform into the Ultra Brothers with the help of their wives. Together, they free Ultraman Mebius from his imprisonment. The five then join Tiga, Dyna, and Gaia help fight Giga Khimaira. After repelling several attacks from Giga Khimaira, it flees into space. The Super 8 Ultra Brothers follow it and finish it off. However after returning to Earth, the cloaked beings once again rise.
The mysterious beings, called Black Silhouette, fuse to become the Giant Black Silhouette. The Giant Black Silhouette states that he will make more powerful monsters and bring despair to Earth. Tiga however replies back that it's useless and that the light in everyone's heart will always protect them. The Super 8 Ultra Brothers combine their powers to use the Superior Myth Flasher and destroy the Giant Black Silhouette.
- Height: 50 m
- Weight: 42,000 t
- Home World: Planet Earth (Superior Universe)
- Gaia Head: Referring to the gold markings on Gaia's head, it is unknown if they also gather light energy or mana from the Earth since the Ultras of the Super 8 Ultra Brothers World do not appear to have time limits.
- Gaia Eye: They can detect hidden enemies, even those that are invisible or hiding behind objects, can also see vast distances.
- Life Gauge: This alternate Gaia also has a Color Timer-like device on his chest, called a Life Gauge. Unlike its World of Ultraman Gaia counterpart, it is green in color and shows no sign of a time limit.
- Gaia Breaster (ガイアブレスター Gaia Buresutā): The gold and black bands around his Life Gauge, they are pieces of armor and sturdiest part of his body, being almost indestructible.
- Gaia Body: The Ultra's body can withstand low temperatures and survive in the vacuum of space. He is also resistant to laser beams and fire. This has similar functions to the Ultra Armor.
Gamu raises the Esplender to the sky and shouts "Gaia!", it then activates and bathes Gamu in a beam of red light where, Gamu is then transformed into Gaia.
This is Gaia's default form. Unlike the original counterpart which received this from Agul, this form is the main form that Gaia appears in. This form is assumed to have the same powers as the original Gaia's form of the same name. As he did not have much on-screen time, many of his abilities are still unknown.
- Maximum Flight Speed: Mach 20
- Maximum Running Speed: Mach 5.5
- Maximum Underwater Speed: Mach 1.2
- Maximum Underground Speed: Mach 1.5
- Maximum Jumping Height: 1,200 m
- Grip Strength: 70,000 t
- Photon Edge (フォトンエッジ Foton Ejji): Gaia can generate a large, pink whip-like beam from his crest using the Gaia Head bands on the back of his head. He clenches his fists, and bows his head before heaving backwards, generating the whip. He then thrusts his head forward, unleashing the attack. It can destroy monsters in one shot.
- Quantum Stream (クァンタムストリーム Kuantamu Sutorīmu): The standard "L" style beam, but with the left fist in the crook of the right arm. This is his secondary finisher, it can destroy monsters in one shot, but is weaker than the Photon Edge.
- Ultra Palifie (ウルトラパリフィー Urutora Parifī): Along with Dyna, Gaia can fire a purifying beam by raising their right arm. This was used to release Tiga from Alien Super Hipporit's capsule.
- Ultra Grand Wall (ウルトラグランドウォール Urutora Gurando Uōru): A combination shield that can reflect enemy attacks.
- Excellent Reflection (エクセレント・リフレクション Ekuserento Rifurekushon): An energy wave used to repair the damages done by Giga Khimaira.
- Ultra Superior (ウルトラスペリオル Urutora Superioru): Gaia and the other Super Ultra Brothers fire their respective finisher attacks.
- Illusionic Slugger (イリュージョニック・スラッガー Iryūjonikku Suraggā): When a blue variant of the Ultra Superior is fired at the Eye Slugger, it can can multiply into many copies.
Glitter Version (グリッターバージョン Gurittā Bājon) was born from mankind's hope to defeat the Giant Black Silhouette.
- Maximum Flight Speed: Mach 30
- Glitter Quantum Stream (グリッタークァンタムストリーム Gurittā Kuantamu Sutorīmu): An upgraded version of the Quantum Stream.
- Superior Myth Flasher (スペリオルマイスフラッシャー Superioru Maisu Furasshā): A combination attack where the Super 8 Ultra Brothers fire their respective finisher attacks.