An Easter egg in Godzilla: King of the Monsters revealed that an iconic battle from a 1960s Toho Godzilla movie happened in the MonsterVerse’s history. It’s well-known that Godzilla and Ghidorah clashed thousands of years ago (and in several of Toho’s movies), but apparently that wasn’t the only fight the two have had before their encounter in Antarctica in King of the Monsters. It would seem that in at least one of their past confrontations, they weren’t alone.
The third MonsterVerse movie
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