The laboratory is able to identify strange oceanic activities attributable to the empire of demons. When the Getta goes out on a patrol he is intercepted by a Demon Robot with whom he engages in a tough fight. Dragon tries to defeat the monster but is killed; Rygar does not get better results and this time it is Benkei's turn to come out the winner: Poseidon's strength proves decisive in the clash with this terrible enemy. But when everything seems over, Hidler, in command of a new flying fortress, bombs the laboratory when Getta Robot is still far away and his energy is almost exhausted.