Poseidon (ポセイドン) is the main antagonist of Kamen Rider OOO: Ankh's Resurrection, The Medal of the Future and The Leading of Hope. He was a Greeed from the future who possessed Michal Minato and became Kamen Rider Poseidon (仮面ライダーポセイドン, Kamen Raidā Poseidon).
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