18화: 도로로가 바위에서 고대 창을 찾아내자 히야쿠마루와 함께 바다 괴물을 풀어낸다.

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Dororo and Hyakkimaru arrive at a fishing village where Dororo foolishly pulls an old harpoon out of some rocks. This releases a skeleton ray-monster called Bira-Bira that escapes into the sea. Dororo is challenged by a girl called Sayo who demands that he return the harpoon. Hyakkimaru dives into the sea following Bira-Bira, but he disappears. The villagers assume he is dead, so to calm Bira-Bira's anger, they send Dororo and the village girl into the sea as a sacrifice. When the demon attacks them, Hyakkimaru appears and destroys it, causing his teeth to be returned to him. (Source: Wikipedia)