The Curse of Cornelius Sigan

Treasure is found in an ancient tomb under Camelot. Gaius is worried that the treasure belongs to Cornelius Sigan, an evil sorcerer and wants the King to have the tomb resealed. A new servant called Cedric attempts to turn Arthur against Merlin. Merlin finds out what Cedric is up to and finds himself being forced to turn to The Great Dragon.