|Human Host/Form:||Hideki Go|
|Home world:||Planet Earth (Superior 8 Universe)|
|Voice actor(s):||Jiro Dan|
|Suit actor(s):||Shinya Iwasaki|
|First Appearance:||Great Decisive Battle! The Super 8 Ultra Brothers|
|Number of Appearances:||1(movie)|
|Affiliation:||Alternate Ultra Brothers|
When the other Ultras were having difficulty fighting Giga Chimera, Goh and his friends change into their Ultra forms and helped the four other Ultramen. They later defeated Giga Chimera with the Superior Strike attack. However, Black Silhouette appeared before them, telling them he would always be alive if there was still a darkness in humanity's hearts. However, Black Silhouette was soon defeated by the eight Ultras' Superior Myth Blaster.
Later, Go and his wife would ride their plane and travel with everyone to Nebula M78.
- Home World: Earth (Superior 8 Universe)
- Height: 53 metres
- Weight: 44,000 tons
- Age: Unknown
- Time Limit: None demonstrated
- Color Timer: The standard Color Timer but unlike its Showa counterpart it is green and shows no signs of a time limit
- Eyes: Ultraman Jack can see beyond the visible spectrum, perhaps the entire spectrum.
- Specium Ray: Jack can fire the Specium Ray by crossing his arms in a lower case "+" style beam . It's exactly like Ultraman's Specium Ray. It can obliterate monsters in one shot.
- Ultra Purify: A beam used with the other Alternate Ultra Brothers to revive Mebius.
- Superior Strike: Used on Giga Chimera, Jack and the other Ultra Brothers fire their respective finisher attacks.
- Ultra Grand Wall: A combination shield that can reflect enemy attacks.
- Ultra Repair: A combination energy used to repair the damages done by Giga Chimera.
- Ultra Superior: A combination of the eight Ultra Brothers firing all of their finishing moves (except Seven who fires his Emerium Ray). First used to destroy Giga Chimera in Space.
- Multiple Eye Slugger: When firing the Ultra Superior on Seven's Eye Slugger, it can cause it to be multipled and attacked the enemy.
Ultraman Jack's glitter Mode only appeared in the climax of the Superior Ultraman 8 Brothers film. After the eight Ultramen defeated the Giga Chimera, the dark wizard appeared. The eight all went into Glitter mode and combined their beam attacks to destroy the dark spectre. It was only used by an alternate Ultraman Jack and is not considered canon in the Showa continuity.
- Glitter Specium Ray: The glitter version of the Specium Ray.
- Superior Myth Blaster: A combination move of all the Superior 8 Brothers Ultra Beam.
- Like all Ultras in this universe, Ultraman Jack has a green color timer instead of blue.