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When out on a hunt, Arthur encounters a huge monstrous creature never before seen. Gaius realises it is a Questing Beast, a creature conjured from the nightmares of a long-dead king, whose bite is always fatal. When Arthur faces the creature again, it is vanquished... but Arthur is bitten and his life hangs in the balance. Merlin is told by the Great Dragon to seek the Isle of the Blessed, where members of the old religion have the power to save the future king. However, there is a price to pay. In order for a life to be saved, a life must be taken...

When Arthur kills a unicorn, he brings a curse upon Camelot. With the mythic city plagued by both famine and drought, time is short for the curse to be lifted. The mysterious Anhora, keeper of the unicorns, tells Arthur he is responsible for bringing the famine to Camelot- and to lift the curse, Arthur will be tested... but unless he makes amends for the killing of the unicorn, Camelot will be doomed.

Merlin's home village of Ealdor is attacked by raiders led by the fearsome Kanan, but Uther will not do anything to help- to cross into Ealdor, which is outside of Camelot's boundaries, would constitute an act of war. Merlin leaves Camelot to help to defend his home- and is surprised to find help from Morgana, Gwen and Arthur. However, an old friend of Merlin's forces the young sorcerer into making a difficult choice: will he use magic to save the village and thus reveal his secret to Arthur?

Uther's past comes back to haunt him as a mysterious black knight interrupts Arthur's coming-of-age celebrations, throwing down his gauntlet and challenging the Knights of Camelot to combat. The Black Knight, seemingly unstoppable, makes easy work of his combatants. But who is the Black Knight, and why is Uther so uneasy?

When a druid and his boy apprentice are caught in Camelot, Morgana and Merlin hide the boy from Uther's guards- but the druid is executed. Uther declares that anyone harbouring the boy will be dealt with severely. They must try and smuggle the boy from Camelot without being caught. However, a visit to the Great Dragon reveals who the young boy is- he is Mordred, the future nemesis to Arthur...

Morgana dreams that Arthur is murdered by a beautiful girl, who shows up in Camelot the following day.

A mysterious physician arrives and cures Morgana of a deadly illness, putting Gaius, who was unable to find a remedy, at risk of losing his job.

Lancelot shows up and saves Merlin from being killed by a monster. Merlin tries to get Lancelot made a Knight of Camelot for his bravery.

Nimueh returns and she tricks Merlin into consuming some poison from a chalice and he becomes very ill. Arthur attempts to find an antidote but ends up walking into a trap set by Nimueh.

When a plague spreads through the Kingdom of Camelot it seems that evil magic is the cause. Merlin and Gaius try and find a cure before it is too late. Gwen is accused of practicing witchcraft and is sentenced to death. Merlin, Arthur and Morgana attempt to discover the real culprit and save Gwen before it is too late.

Camelot holds it's yearly sword tournament. Knight Armed usies a magical shield and is determined to win at any cost. Merlin is determined to prove that Valiant is cheating before Arthur is killed in a dual with him.

Merlin is told by the Great Dragon that is is his destiny to make sure that the young Price Arthur is kept safe. Anybody caught performing magic though is punished with the death penalty and Merlin is not a fan of Arthur. When Arthur's life is endangered Merlin finds himself tested.