The Mushroom War (also referred to as the Great Mushroom War) was an apocalyptic event that occurred roughly a thousand years before Adventure Time. It was a global nuclear exchange (hence the term Mushroom war) that occurred sometime between the late 20th and early 21st centuries. The Earth physically was completely and forever transformed by the conflict, and by its end the entire planet was devastated. The war crippled and eventually resulted in the near total annihilation of the Human…
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