Exciting plot details for the final two episodes of Merlin’s fourth series have been released by the BBC.

Episode 12

With Morgana at the head of a vast Southron army, a deadly net is closing in around Camelot, as the drama continues.

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?

Colin Morgan plays Merlin with Bradley James as Arthur, Katie McGrath as Morgana, Nathaniel Parker as Agravaine, Richard Wilson as Gaius, Angel Coulby as Gwen, Tom Hopper as Sir Percival, Eoin Macken as Sir Gwaine, Adetomiwa Edun as Sir Elyan and Rupert Young as Sir Leon.

The guest cast for this episode are Terence Maynard, who plays Helios, Ben Daniels, who plays Tristan and Miranda Raison, who plays Isolde.

Episode 13

Morgana and Helios have successfully captured Camelot, and Merlin and Arthur are outlaws on the run, in the last episode in this series of Merlin.

Trapped in Ealdor with a ruthless army closing in, their situation becomes desperate. Arthur must take control before Camelot is lost forever…

But faced with Agravaine’s betrayal and the strength of Morgana’s force, the young King has lost his conviction.

Only Merlin can restore his faith, and only an extraordinary act can prove to the King that he was born to rule.

Will the young warlock convince Arthur before his dreams of Albion fall to pieces?

Colin Morgan plays Merlin with Bradley James as Arthur. Katie McGrath as Morgana, Nathaniel Parker as Agravaine, Richard Wilson as Gaius, Angel Coulby as Gwen, Tom Hopper as Sir Percival, Eoin Macken as Sir Gwaine, Adetomiwa Edun as Sir Elyan, Rupert Young as Sir Leon.

The guest cast includes Terence Maynard as Helios, Ben Daniels as Tristan and Miranda Raison as Isolde.