Owing to the Oracle's prophesy, Perseus is born in darkness and captivity. Together with his mother Danaë, the young son of Zeus manages to escape death at sea. After coming of age, the young hero vows to bring back back Medusa the Gorgon to stop the evil king Polydektes from marrying his mother. He is given special weapons and armor by the gods to complete his task but still cannot escape the prophesy that he will one day kill his grandfather.
The TV Archaeologist
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[hearing how Danaë was blessed to bear Perseus
Oh. So *that's* how it's done.