Eiji Serizawa - Died of natural causes.
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He was so feared that ancient cultures wrote basically nothing about him. Is ridiculously powerful I mean not even destroyah can beat this guy I mean no one apart from thermo Godzilla killed him.Godzilla is like god and ghidorah is like the devil their arch nemeses! He even came back to life in Godzilla vs kong as mecha Godzilla!
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1 King Ghidorah King Ghidorah is Godzilla's Greatest Enemy of all times since 1964's Ghidorah: The Three Headed Monster.