During their fight against the Hell Expansions, Neptuneman and Seiuchin, his identity is finally revealed and he goes head to head with the Perfect Chojin Seiuchin. When Seiuchin is brought back to his senses, both Neptuneman and Mammothman betray their partners, when Warsman had just defeated Seiuchin, and team up in the middle of the match. They knock off Seiuchin's face with an Optical Fibre Cross Bomber, then they defeat Warsman.
Before the semi-finals begin, Satan appears in the sky, and Neptuneman and Mammothman reveal their allegiance with The Five Disasters Thunder and Lightning, throwing a hell-spawned spider at Kinnikuman, which enters his body and forms into an hourglass.
(More to Come)
Large optical fibres protrude from Neptuneman's arm and attach themselves to the opponent's back, while Mammothman does the same from the front with one of his tusks, holding the opponent in place. They then perform an explosive Cross Bomber. The result of this technique is that the skin on the opponent's face is knocked off.
Hell Freeze Drop (地獄の氷結落とし)