Ultraman Agul is the second Ultra Hero of Ultraman Gaia. Agul is the manifestation of the sea, much like how Gaia is the manifestation of the Earth. Agul bonded with Hiroya Fujimiya to protect the Earth, but not humanity, leading to several disagreements and battles against Gaia.

In episode 41, Fujimiya reappears very much alive. He still tries to fight what he perceives as "the good fight" against humanity and the Radical Destruction Bringer. He no longer has the power of Ultraman, though, to help him, and realizing he was powerless to stop the Radical Destruction Bringer, he sank into depression; finally, he stumbled into the ocean, only to be rescued by the nearby Gamu. Fujimiya still believed humanity would be responsible for the great calamity predicted by Crisis, but he also knew Gamu/Gaia was the Earth's last hope. Fujimiya called out to the Earth ... and it responded, freezing time, as it did when Gamu called out to Gaia. A great wave crashed over Fujimiya, and as the waters began to glow with blue light, the ocean parted to reveal a revived Ultraman Agul V2.