Clash of the Titans (1981)

King Acrisius of Argos imprisons his daughter Danaë , jealous of her beauty. When the god Zeus impregnates her, Acrisius sends his daughter and his newborn grandson 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 creature called the Kraken, to destroy Argos. Meanwhile, Danaë and Perseus safely float to the island of Seriphos, where Perseus grows to adulthood.