212. The Fires of Idirsholas
When the fires of Idirsholas burn for the first time in 300 years, Gaius fears a sorcerer has reformed the deadly Knights of Medhir. Arthur and Merlin ride out to face the Knights ... and barely escape with their lives. Upon returning home, they find everyone in Camelot is under a strange enchantment - all except for Morgana. Could she be behind the magic which threatens the Kingdom?

As the Knights attack a defenceless Camelot, Merlin's loyalties are tested to the limit. Guest Stars: Emilia Fox as Morgause

• First aired: Dec 12, 2009
• Directed by Jeremy Webb
• Creator: Julian Jones and: Jake Michie and: Johnny Capps and: Julian Murphy Written by Julian Jones
• Cast: John Hurt (The Dragon (voice)), Emilia Fox (Morgause), Jem Wall (Joseph), Anthony Head (Uther Pendragon), Richard Wilson (Gaius), Bradley James (Arthur), Colin Morgan (Merlin), Katie McGrath (Morgana), Angel Coulby (Gwen), Rupert Young (Sir Leon).

213. The Last Dragonlord
The Great Dragon is finally free and sets out to destroy Camelot, full of rage. Arthur and his men cannot stand the battle for much longer, and Merlin's powers are useless. Only a dragonlord can kill a dragon, and Uther wiped them all out years ago. Or did he? Gaius admits one such Dragonlord escape, but what is his connection with Merlin? Balinor is the key to the future of Camelot, but will Arthur and Merlin find Balinor in time to save the kingdom and can they persuade him to return to Camelot to save his enemy, Uther and the kingdom of Camelot?

Guest Stars: John Lynch as Balinor

• First aired: Dec 19, 2009
• Directed by Jeremy Webb
• Creator: Julian Jones and: Jake Michie and: Johnny Capps and: Julian Murphy Written by Julian Jones
• Cast: John Hurt (The Dragon (voice)), Bradley James (Arthur), Richard Wilson (Gaius), Angel Coulby (Gwen), Colin Morgan (Merlin), Rupert Young (Sir Leon), Anthony Head (Uther Pendragon), Jonathan Coyne (Asgerd), Alexander Delamere (Innkeeper), John Lynch (Balinor).