High above the realm of man, the world's gods have gathered to decide on one matter: the continued existence of mankind. Under the leadership of Zeus, deities from Ancient Greece, Norse mythology, Hinduism, and other pantheons convene every thousand years to determine humanity's fate. Due to their relentless abuse of each other and the planet, the gods this time vote unanimously to end the human race. But before the decree is finalized, Brunhilde, one of the 13 demigod Valkyries, proposes an alternative: instead of anticlimactically annihilating mankind, why not give them a fighting chance by enacting Ragnarök, a one-on-one showdown between man and god? Spurred by the audacity of the challenge, the divine council quickly accepts, fully confident that this contest will demonstrate the gods' utter might. To stand a chance against the mighty heavens, Brunhilde must assemble history's greatest individuals; otherwise, the death knell will surely sound for mankind.