A three-eyed green moth monster who based himself at cave for his experimentation to revive the deadly Gaina Moth from extinction, altering their venom so the infected have an hour before mutating into humanoid Gaina Moths. With Reiko, her teacher, Shigeru, and his friends stumbled into it and are trapped within the cave and poisoned as a result, Kotaro attempts to deliver the curse with Gynagamoth attacking him. Using Rideron to hold off Gynagamoth, RX manage to cure his friends before killing him with the Revolcane, causing the Gaina Moths to die out as a result. Episode 5

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