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"Massive Unidentified Terrestrial Organism" refers to a species of giant monsters that appeared as the main antagonists in Godzilla (2014).
M.U.T.O.
Monsters
for Monsters in Godzilla B.C.
Suggested by tomzillawash3r3
Millions of years ago before 1954, Godzilla existed alongside primitive human beings and giant monsters that walk the Earth.
