Uther is determined to once and for get rid of all the magic being performed inside Camelot. Aredian, a witch finder is called to Camelot to help deal with the problem. Gaius tries to make Merlin see how much danger he is in. Morgana is certain that Aredian will discover her secret and Merlin attempts to protect bother her and Gaius.
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.