Morgana has dreams about Guinevere becoming Queen of Camelot. Morgause encourages her to reveal Arthur and Gwen's relationship to Uther, who decides to make sure they never marry. Arthur decides to leave with her after his father banishes Gwen from the kingdom. Merlin has to risk everything after Morgana causes more problems for Gwen.
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.