Quest for Courage - S1.E6

A magical being named Krisian comes to Camelot to inform Merlin that her father and Merlin's good friend Reicus is being held prisoner by a Sea Serpent. After Everett forces Arthur and his Knights to battle the Warlords, the Knights find help from a village and in fear of reprisal against the village, Arthur goes on alone with Krisian despite her warnings of a probable trap.