|Home world:||Cyber Space|
|First appearance:||Gridman episode 10: "Dangerous Gift"|
Subtitle: Underground Monster (地底怪獣 Chitei Kaijū?)
- Height: 89 m
- Weight: 62,000 t
- Origin: Cyber Space
Angered by water pollution, Takeshi Todo had Terragaia go into a city water plant to turn the water supply into hydrochloric acid. With its gas, Terragaia could melt circuit panels and burrow underground in the computer world. While Yuka Inoue was analyzing a sample of the tainted water, Gridman alerted the gang about Terragaia. However, Gridman walked into a trap when he entered the plant's computers. His ankles were shackled and was being asphyxiated by Terragaia's gas. Luckily, Ippei had finished designing Thunder Jet and Twin Driller; using the new mecha, Twin Driller broke the shackles and Thunder Jet used the Thunder Ring to muzzle Terragaia. Unable to spray its gas, Terragaia was destroyed by Gridman's Grid Beam.
- Terragaia's body design was later used for the inspiriation for Dazzlba and later Skubone.
- Terragaia might be a tribute to the monster Antlar.
- Terragaia shares his title with Telesdon.
Powers and Abilities
- Acid Gas: From it's mandibles, Terragaia can fire a cloud of toxic acid gas.
|Denkou Choujin Gridman Kaiju & Seijin|
|Khan Digifier | Gilarus | Bamora | Volcadon | Stealgan | Bagira | Anoshiras | Flamelar | Blizzalar | Shinobilar | Terragaia | Metallus | Magnegauss | Generadon | Mecha Gilarus | Shinobilar II | Mecha Bamora | Imitation Anoshiras | Mecha Bagira | Mecha Flamelar | Mecha Stealgan | Dazzlba | Neo Metallus | Mecha Generadon | Plandon | Venora | Boranga | Eyegangar | Kung Fu Shinobilar | Jubagon | Teleboze | Gyurunba | Chidogerah | Abumaru | Goromaking | Devil Phazer | Khan Giorgio | Skubone | Giant Khan Digifer|