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Named for the planet Neptune. GekiRyuJin's counterpart in the Soul Masters, the most blatantly so. Resembled a cross between a mechanical jellyfish and a pair of lungs. One tenticle was equipped with a large fan, the other a massive electromagnet. Fought in Sankyuu, Repli-China. Controlled wind and electromagnetism, as well as the weather.
In a scene heavily reminiscent of a major scene in the original Getter Robo, destroyed by GekiRyuJin through direct contact with a compact and robust self-destruct device. Ptulone was then replicated several dozen times by Pisa Sol; these faded away with its destruction.