Morgana is tormented by dreams of Guinevere becoming Queen of Camelot. Encouraged by Morgause, she decides to reveal Arthur and Gwen's courtship to Uther, who will do whatever it takes to stop his son from marrying a serving girl.

Merlin and Arthur are sent on a dangerous mission to capture the Cup of Life, a powerful magical artifact that carries the gift of immortality. Before they can retrieve the Cup, they are captured by the unscrupulous slave trader, Jarl.