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Arthur befriends Amy Dorrit and involves himself in her family's affairs.
Knight Valiant competes at Camelot's annual sword tournament. Merlin believes he's a cheat
Arthur Clennam seeks to learn more about young seamstress Amy Dorrit.
Merlin arrives in Camelot but finds magic outlawed, its practice punishable by death.
Nimueh returns to Camelot and poisons Merlin. Can Arthur save him in time?
Merlin tries to repay Lancelot for saving his life by having him made a Knight.
When the Lady Morgana is struck down with an illness, Gaius is at a loss for a cure.
Arthur's chivalry leads to danger when he rescues a damsel in distress and her father.
An Al Qaeda cell kidnap a soldier and demand that Remembrance Sunday be cancelled.
Merlin races to find the cure for a deadly plague spreading through Camelot.
Harry vows revenge by taking down the head of Russia's intelligence service.
Flintwinch taunts Arthur's mother about the mystery at the heart of the House of Clennam.
Amy receives a proposal of marriage, and the villainous Rigaud arrives in London.
Lucas reveals that the Russians interrogated him about MI5's most secret spy operation.
Merlin and Morgana risk execution when they try to help a magical young fugitive.
Al Qaeda's number three wants to negotiate, and Lucas's double agent status is tested.
Amy accompanies her sister Fanny to meet Mrs Merdle, queen bee of London society.
Pancks recruits John Chivery to help solve the mystery at the heart of the Dorrit family.
Father Jacob must perform a dangerous exorcism in order to ensure a young girl's safety.
A mysterious insider dishes the dirt on all that is bad in the advertising industry.