Eoin Macken

In this first episode of a two-parter, Merlin and Arthur are sent on a dangerous mission to capture the Cup of Life, a powerful magical artifact that carries the gift of immortality. Before they can retrieve the Cup, they are captured by the unscrupulous slave trader, Jarl. Gwaine comes to the rescue and they escape, but with Jarls help the cup falls into Morgause's hands. With an immortal army at their disposal, will Morgause and Morgana topple Uther once and for all?

As dawn breaks across the icy tundra, Merlin and Arthur are close to exhaustion. With each tortured step, the fortress of Ismere looms ever nearer and Merlin's fear intensifies. What game is Mordred playing? And what powerful secrets are Morgana and the druid Ruadan searching for amongst its twisted catacombs? It seems like this time, not even Merlin can stop Arthur from walking right into the lion's den… For in this bleak and transient wilderness, only one thing is certain: the great trial for Albion has finally begun.

With Morgana at the helm of a vast Southron army, a deadly net is closing in around Camelot... When the sorceress strikes, the ferocity of her attack forces everyone to run for their lives - even Arthur. But Morgana won't let him escape that easily. And so begins a chilling hunt... Can Merlin save the King from Morgana's clutches? Or has Arthur's luck finally run out?

The second episode of this two parter finds the kingdom on the brink of collapse and Morgana poised to strike. As Lancelot (Santiago Cabrera) races back to Camelot with the dying Merlin, Arthur must continue on his mission to vanquish the Dorocha without them. Though the Knights know their journey to the Isle of the Blessed is fraught with danger, none could anticipate the sacrifice Arthur intends to make there. Friendship and loyalty are tested to the limit, but in the end, it's the power of love that changes all their lives forever...

Merlin faces his toughest challenge yet when Morgana's blinkered determination threatens not only Arthur's future, but the very balance of the world. With her magic stronger than ever, the sorceress summons the mighty Callieach (Gemma Jones) to tear open the veil between the worlds. Hellish creatures pour forth, killing any who succumb to their touch. With Uther a shadow of his former self, it falls to Arthur and his loyal Knights, including Lancelot (Santiago Cabrera) to protect the kingdom. But it will take more than just swords to vanquish their enemy and Merlin is shocked to the core when he discovers the only way to restore the equilibrium requires a sacrifice of unimaginable proportion...