Perseus grows up wanting to be a hero, but he cannot become one if his mother Danae still sees him as a boy. When his stepfather Polydektes casts him away on a voyage across the sea, Perseus is determined to fulfil the great destiny of the son of a god and the grandson of a king. But the line between heroism and monstrosity is thin, and when Perseus attempts to seduce first gentle Medusa and then beautiful Andromeda, before finally reuniting with Danae, they each learn of the dangers of resisting a boy prepared to risk it all for greatness.