Jiger

A legendary demon who inhabited the lost continent of Mu, Jiger was awakened in the modern day when the statue known as the Devil's Whistle was removed from Wester Island. Jiger had a brief skirmish with Gamera before pursuing the statue to Osaka, Japan, where Gamera arrived to challenge her again. Jiger defeated Gamera by infecting him with her parasitic young, then moved on to the location of Expo '70, where she threw the Devil's Whistle into the ocean. Fortunately, Gamera was cured by humanity and returned for a final duel with Jiger, where he successfully killed her by retrieving the Devil's Whistle and throwing it into her skull.