|Home world:||Presumably Planet Baltan|
|First appearance:||Ultraman (planetarium Special Edition)|
|Latest appearance:||Ultraman Boy's Ultra Coliseum|
Subtitle: Black Hole Monster (ブラックホール怪獣, Burakkuhōru Kaijū?)
- Height: 80 m
- Weight: Infinite
- Home World: Presumably Planet Baltan
Ultraman Planetarium Special Episode
Blackium appeared in the film work of Ultraman, which was produced for planetarium screening in 1998. Alien Baltan did not give up on their conquest for earth. They attacked spacecraft and space bases of humanity one after another. Ultraman is immediately dispatched by Zoffy. Alien Baltan commanded the black hole monster Blackium to fight Ultraman. Blackium got the upper hand by absorbing Ultraman's energy attacks. However, Ultraman Neos and Ultraseven 21 appeared and the three ultra warriors defeated Alien Baltan and Blackium.
Ultraman Boy's Ultra Colisuem
Blackium reappears in this series in one of the newly shot fight scenes. He first takes on Satanbizo and easily kills him. Zoffy appears and tries to kill the monster, but Blackium got the upper hand and beat Zoffy to the ground. Luckily, Crimson Dragon and Blue Tornado appeared to assist Zoffy. They flew around Blackium, dizzying the beast, allowing Zoffy to slash him and turn the kaiju to dust.
- Blackium's design and powers is a tribute to the kaiju Bemstar.
Powers & Abilities
- Black Hole Gorge: Blackium posseses a gorge on his abdomen similar to Bemstar. It can absorb energy based attacks.