Great Decisive Battle! The Super 8 Ultra Brothers
When the other Ultras were having difficulty fighting Giga Khimaira, Seiji and his brothers change into their Ultra forms. The four original Ultra Brothers: Ultraman, Ultraseven, Ultraman Jack and Ultraman Ace revived the defeated Mebius. Later they all joined Tiga, Dyna and Gaia against the Giga Khimaira. They defeated it with the Ultra Superior attack. However, Black Silhouettes appeared and combined into the Giant Black Silhouette, telling them he would always be alive if there was still darkness in humanity's hearts. Mankind's determination allowed the eight Ultras to achieve their Glitter forms, and Giant Black Silhouette was soon defeated by the eight Ultras' Superior Myth Flasher.
Later, Hokuto and his wife ride their plane and traveled with everyone to Nebula M78.
- Height: 40 m
- Weight: 45,000 t
- Home World: Planet Earth (Superior Universe)
- Ultra Hole: The hole in Ace's crest.
- Color Timer: The standard Color Timer, but unlike its Showa Era counterpart it showed no sign of a time limit.
- Ultra Star: The gem on Ace's head, it is currently unknown how this organ functions.
- Ultra Armor: Ace has the typical Ultra resistances and vulnerabilities.
- Arms: Assumed to be used similar to his original counterpart.
Seiji Hokuto puts his Ultra Rings together and transforms into Ultraman Ace.
- Metalium Beam (メタリウム光線 Metariumu Kōsen): Ultraman Ace's signature move. Ace thrusts his arms to his left, then he swings them back towards his target and forms his arms in a "L" shape stance. The beam is powerful enough to destroy monsters in one shot.
- Vertical Guillotine (バーティカルギロチン Bātikaru Urutora Girochin): Ace crosses his arms parallel and vertically with one another and separates them in opposite directions, this releases a thin line of energy that can slice opponents in half.
- Ultra Palifie (ウルトラパリフィー Urutora Parifī): Ace along with Ultraman, Seven, and Jack can fire a blue beam from their right arm, used to revive Mebius.
- 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): Ace 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.
- Glitter Metalium Beam (グリッターメタリウム光線 Gurittā Metariumu Kōsen): An upgraded version of the Metalium Beam.
- 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.