Merlin series 2

Digging beneath the castle uncovers a tomb full of wealth and the waiting soul of a dead sorcerer. A would-be thief ingratiates himself with Arthur and usurps Merlin's position to get access to the key that will allow him to rob the tomb, but he gets more than he bargained for and is possessed by the dead sorcerer. Merlin is forced to go to the Great Dragon for help to defeat the powerful sorcerer, but the price is a promise of freedom.

Prince Arthur learns his knights are deliberately letting him win at jousting practice because of his royal status and so believes that he will only be able to prove himself in a jousting tournament if his opponents do not know his real identity. While he goes under cover to compete as an unknown knight, an assassin arrives in Camelot to murder the prince.

Morgana begins to suspect she has magic and Merlin wants to help despite Gaius' warning not to get involved. Merlin helps Morgana to reach out to the Druids, but King Uther declares she has been abducted and sends Arthur with a party of knights to kill the Druids and rescue Morgana.

A gang of criminals abduct Morgana and Guinevere intending to force King Uther to ransom his ward. When Morgana escapes, her abductor attempts to pass off Gwen as the king's ward. While imprisoned, Gwen discovers Lancelot working for the kidnappers. As Arthur and Merlin attempt to rescue Guinevere, she and Lancelot also make a bid for freedom.

The lone survivor of an attack on a nobleman's household and her odd servant obtain refuge with an old friend, King Uther, but she is not what she appears and Merlin must somehow stop the King from marrying a troll.

Even when Merlin successfully unmasks the troll for what she really is, her enchantment continues to hold her new husband, King Uther, in love. It will take Arthur's death to break the spell.

A harmless bit of magic by Merlin brings the wrath of Uther's witchfinder down on Camelot. The witchfinder accuses Merlin of being a sorcerer but Gaius takes the fall to protect Merlin. With Gaius due to be burned alive at the stake, Merlin must find out how the witchfinder fabricated the "evidence", expose him and save Gaius.

Arthur faces a challenge from a mysterious knight who turns out to be a woman. He is forced to face Morgause in a battle to the death. She defeats him but spares his life in exchange for a promise to meet her and further tempts him with the knowledge that she knew his mother. What Arthur discovers when Morgause uses her sorcery to allow him to speak with his dead mother sends Arthur back to Camelot intent on killing his father.

Merlin rescues a young "cursed" Druid girl and hides her. He begins to fall in love with her. At the same time, mysterious murders start to occur in Camelot.

Five kings gather in Camelot to sign a peace treaty, but one of them intends to sabotage the peace. King Alined's jester uses magic to enchant Prince Arthur to fall in love with the beautiful Lady Vivian to incite a war between her possessive father, King Olaf, and Camelot. After finding them in a compromising situation, Olaf challenges Arthur to a duel. Merlin finds that the spell's cure is a true love's kiss, and must convince Gwen to kiss Arthur.

An unscrupulous rebel, Alvar, uses Mordred to contact Morgana and convince her to steal a valuable crystal which he believes will aid in his quest to overthrow Uther. Arthur is able to retrieve the crystal but not before Merlin has been tempted to use it and sees a vision of the future which terrifies him. After Uther condemns Alvar to death, Morgana disowns him and helps Alvar escape.

Morgause uses her magic to re-awaken seven undead knights to attack Camelot. She seduces Morgana into being the source of a spell which puts everyone in Camelot to sleep and leaves the city vulnerable. When Merlin and Arthur return to the city to warn that the undead knights are awake, they are helpless to break the spell and begin to succumb to sleep themselves. After Merlin promises on his mother's life to free him, the Great Dragon advises Merlin to kill Morgana to stop the spell. Cornered into a desperate situation, Merlin is forced to poison Morgana, coercing Morgause to lift the spell in order to save her. Morgause takes Morgana away with her. Merlin fulfills his promise and frees the Great Dragon.

Merlin's promise unleashes the Great Dragon's revenge on Camelot. When Merlin's magic proves ineffective, the only hope is to contact the last living Dragonlord. But as Arthur and Merlin set out on their quest, Merlin's mind is full of the shocking revelation Gaius has told him.