King Acrisius of Argos imprisons his daughter Danaë, in an attempt to prevent a prophecy that her child will bring about his demise. When the god Zeus impregnates her, Acrisius banishes his daughter and Zeus' newborn son Perseus to sea in a wooden chest. In retribution, Zeus kills Acrisius and orders Poseidon to release the last of the Titans, a gigantic sea monster called the Kraken, to destroy Argos.