S1, E6: The fantasy adventure romp based on the legend of King Arthur continues. When the Lady Morgana is struck down with a mysterious illness, Gaius is at a loss for a cure. Thankfully a new physician, Edwin Muirden, is on hand to bring the King's ward back from the brink. As the stranger charms his way further into Camelot's court, winning over everyone from Uther to Merlin, Gaius begins to doubt his credentials. Just who is the mysterious newcomer and what does he want with the royal family? Gaius' loyalty and bravery are going to be tested to the limit if he is to find out.