As Bayard and the Knights of the Western Isles are welcomed to Camelot for a feast, Nimueh infiltrates Bayard's entourage and begins a plot to get revenge on Merlin.
Posing as a servant girl, she tricks Merlin into drinking from a poisoned chalice. Falling gravely ill, the only chance Merlin has is for an antidote to be prepared. Arthur takes it upon himself to retrieve the needed ingredients but, with Nimueh doing everything she can to thwart Arthur's quest, will they be able to save Merlin in time?
Merlin is a young warlock who arrives in the kingdom of Camelot after his mother arranges for him to stay with the court physician, Gaius. He discovers that the king, Uther Pendragon, has outlawed magic and imprisoned the last great dragon deep under the kingdom.
The dragon tells Merlin that he plays an important role: to protect Uther's son, Arthur, who will bring forth a great kingdom. When Merlin meets Arthur, he believes that he is arrogant and Arthur, likewise, views Merlin as subservient. Merlin must keep his magic secret or face being executed by Uther.
Merlin - The Poisoned Chalice Synopsis and Schedule