before he leaves, hades reveals that perseus is a demigod. his origins are compared by io (gemma arterton), a girl cursed with agelessness for spurning a god's romantic advances; he was born after zeus impregnated danäe, who was the wife of king acrisius (jason flemyng), in revenge for rebelling against the gods. after he tried to kill his wife and illegitimate son by drowning them in a coffin, zeus struck him with lightning, deforming him and transforming him into the monster calibos. perseus leads the king's guard to a trio of hags called the stygian witches, looking for a way to kill the kraken. after being betrayed by hades, zeus sends perseus a sword forged on olympus and the winged horse pegasus. perseus refuses them both, but draco, captain of the king's guard, keeps the sword for when perseus needs it.