The Song of the Sirens (S01E06)

Desperate to win over Medusa's heart, Hercules pays a visit to a powerful witch, Circe. But events take a malevolent turn when Hercules realises he has unleashed a potent but toxic enchantment that threatens to turn his burgeoning hope into unbearable grief. With a bitter chain of events rapidly unfolding, it is up to Jason to undo history before it is too late. As he re-traces Hercules's steps into the mountains he is unaware that a deadly trap has been set for him; one with far-reaching consequences beyond the fate of just his friends. (BBC)