Also known as: ウルトラマンゼアス, ゼアス, 哉阿斯奥特曼
The titular Ultra of Ultraman Zearth (Series). His human form/Disguise is Asahi Katsuto.
For awhile, he was the unofficial mascot for the advertisements for the Idemitsu (Gas Station) petrolum company, hence the product placements in the movies. He would be succeeded in this role by the Ultra Idemitsujin, who would appear exclusively in Idemitsu commercials.