Merlin (Colin Morgan) is a young warlock who arrives in the kingdom of Camelot after his mother arranges for him to stay with the court physician, Gaius (Richard Wilson). He discovers that the king, Uther Pendragon (Anthony Head), outlawed magic twenty years ago in an event known as the Great Purge and imprisoned the last Dragon deep under the kingdom. After hearing a mysterious voice inside his head, Merlin makes his way to the cavern beneath Camelot where the Great Dragon (voice of John Hurt) tells Merlin that he has an important destiny: to protect Uther's son, Arthur, who will return magic to Camelot and unite the land of Albion.
When Merlin meets Arthur, he believes that he is an arrogant bully and Arthur (Bradley James), likewise, has a less than stellar opinion of Merlin. After saving the prince's life Merlin becomes his servant and the two begin to respect and trust one another. Merlin eventually becomes close friends with Arthur, and another servant named Guinevere (Angel Coulby). But when Uther's actions eventually cause his ward Morgana (Katie McGrath) to turn against Camelot, Merlin must work together with the Once and Future King (Arthur) to save Albion.
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