 This article is about a monster in Uchuu Keiji Gavan.
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Sai Monster (サイモンスター Sai Monsutā) is a rhinoceros-like the twelfth BEM Kaiju that later turned into Sai Doubler fusion with Doubleman Renoman. Its only known power is a set of horns on its head.
Rhino Monster with horn.png
Rhino Monster concept art