1. Godzilla Is the Atomic Bomb
When this mega-monster (an unforeseen byproduct of humanity's progress) rose out of the sea to turn Japan into a fiery wasteland just nine years after the bombing of Hiroshima, the metaphor was not lost. While that metaphor was certainly weakened as he was brought back to battle monsters again and again and again, even his status as Japan's giant protector has its own metaphorical value.