|Human Host/Form:||Captain Shu of AET III|
|Age:||2,600 years old|
|First Appearance:||Project Ultraman Trailer|
|Last Appearance:||Ultraman Live Show 4D|
|Number of Appearances:||N/A (various stage shows)|
Returning to Earth, Ultraman Millennium fuses with his human host (played by Mathew Dean) under Mother of Ultra's instructions. As a result from his consecutive training, he has gained a lot of new techniques, and has gotten stronger. Saving the Earth from the Dimensional Graveyard and fighting with Alien Baltan during the "Dark Ultra Crisis" has gained him considerable recognition from the Ultra Brothers. who accepted him and assigned him the duty to protect the Earth from a new disaster that will come with greater foes to deal with.
- Height: 40 m
- Weight: 40,000 t
- Age: 2,600 years old
- Human Host: Captain Shu from AET III, Mathew Dean (Actor's Name)
- Transformation Item: Warp Changer
- Eyes: Glowing blue like Ultraman Powered's, Millennium's eyes are unique among the Ultra Brothers.
- Color Timer: Millennium's Color Timer is designed oddly similar to the round table shown in the trailer.
- Luna Blast Ray: What is presumed to be his finisher beam.
- Orion Arrow: What is presumed to be arrow-shaped energy projectiles.
- Double Arm Shot: What is presumed to be energy shots from the arm.
- Cross Cutter: What is presumed to be an energy slicer.
- Extreme Wide Shot: What is presumed to be an extremely powerful version of the Wide Shot used by Ultraseven.
- Timer Ray (Name Unknown): A blast of energy fired from his Color Timer.
For unknown reasons Millennium was apparently meant to have 2 human hosts. One of Millennium's hosts was going to be named Captain Shu. Unlike previous human hosts, this host was Thai instead of Japanese. He was in a group named AET III.
In the Ultraman Project, Millennium's Host was played by actor Mathew Dean. His transformation device was a Beta Capsule like object.