The 100-meter-tall monster in Gaia Ultraman appeared in the 52nd episode, Final Battle! Gaia Ultraman. It was a monster from another planet named "Giant Astroman"(Giant Cyborg) that was defeated by Gaia and Aguru. During the battle, the giant alien used a magical power that could manipulate time and space, causing Gaia and Aguru to fall into a predicament. In the end, Gaia Ultraman used his own light, heat, and Aguru to use energy bombs and ultimate flash to defeat the giant alien.