Subtitle: Evil Spirit Beast (邪神魔獣 Jashin Majū)
- Height: 70 m
- Weight: 70,000 t
- Origin: Unknown
Ultraman Taiga The Movie: New Generation Climax
A monster that was sealed inside Tregear and became his source of power.
Powers and Weapons
- Grim Howling (グリムハウリング Gurimu Hauringu): A shockwave unleashed by roaring loudly.
- Grim Bolt (グリムボルト Gurimu Boruto): Grimdo can fire red lightning bolts through its horns and hands.
- Grim Ray (グリムレイ Gurimu Rei): A destructive beam fired from Grimdo's mouth.
- Energy Beams: Grimdo can fire yellow energy beams.
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