Merlin is back for a fourth series of the hit BBC adventure as Camelot stands on the brink of a golden age. But its birth will not be an easy one. For the forces of evil are gathering and the darkest hour is just before the dawn This series sees the arrival of the fearless Knights of Camelot and a fantastic guest cast featuring Gemma Jones (Bridget Jones' Diary, Harry Potter), Phil Davis (Doctor Who, Brighton Rock) and Nathaniel Parker (Stardust, The Chronicles of Narnia) as well as the return of Santiago Cabrera (Heroes, Che) as the dashing Lancelot. With its thrilling mix of action, adventure and pure magic, the fourth series of Merlin will captivate the imagination as never before

The complete box set contains all 13 episodes of Series four.

Exclusive extras include:

Making Of Series 4 Film, Cast Crew Audio Commentaries, Deleted Scenes, Out-Takes, Storyboards