Ep 33. The Ultraman: S1 E33 - Duel With Ultraman

Underwater volcanoes explode in the Pacific Ocean, followed by changes in the earth's crust in various locations. The Science Guard Party goes to Maroi Island to find the cause, and take off in the new prototype subterranean tank, Passerger 3. The mollusks they find on the bottom of the ocean merge together to form Monster Gamiba!