Ultraman S01E07 - S.O.S. Mount Fuji

Mt. Fuji threatens to erupt after hundreds of years of dormancy. lppei accompanies Yuriko on an assignment to investigate the danger, but is stymied when the local constable fails to get citizens to take the danger seriously. Increased volcanic activity causes a huge boulder to be expelled from the bottom of Lake Yoshino, but the stone proves to be not a mere rock, but a living monster, Gorgos.