Giants. Monstrous children of the goddess Earth; siblings of the Cyclopes and Titans. Some say that it was Zeus's overthrow of his father Cronus and the other Titans that caused the Giants to meditate revenge. They stormed Mount Olympus, hurling boulders and burning tree trunks. The Olympians were advised that they would go down in defeat unless aided by a mortal, so they called in Heracles and prevailed with the hero's aid.