Arthur rescues the elderly Aulfric and his pretty daughter Sophia from bandits and they are welcomed to Camelot. Arthur quickly falls in love with Sophia and they plan to elope. Morgana is very alarmed as she has a recurring dream in which Sophia drowns Arthur. She confides in Gaius and Merlin, who realize that the dreams are prophetic and that Morgana may have magic. Merlin follows Aulfric to a lake, where he discovers that father and daughter are Sidhes, former immortals who have lost their immortality and who must kill Arthur in order to regain it.
