Christopher Fairbank

A mysterious knight arrives in Camelot, uncovering a secret from the past that Uther would prefer stayed buried. At Arthur's coming-of-age ceremony, the celebrations are interrupted when a mysterious Black Knight crashes his horse through the window. He throws down his gauntlet and challenges the knights of Camelot to single combat. Sir Owain, a young, eager knight, picks it up and accepts the challenge – they will fight the next day. Uther is as white as a sheet as he watches the knight go, staring intently at the distinctive crest which marks his helmet. The following day, a large and nervous crowd gathers to watch the fight. Sir Owain strides out to the waiting Black Knight and the pair do battle. The Black Knight is an awesome warrior, and it looks like Sir Owain doesn't stand a chance. However, Merlin is delighted when the young knight successfully strikes his opponent. He sees the blade go in but the Black Knight doesn't even flinch and, seemingly unaffected by the blow, he goes on to slay Sir Owain. Later, Gaius takes Merlin down into the crypt below Camelot and to the tomb of Tristan De Bois. Gaius is horrified to see that it is empty – his body has gone. Merlin listens as Gaius explains that the mysterious knight bears the crest of Tristan De Bois, who was the brother of Uther's wife. Driven mad with grief, he blamed Uther for his sister's death in childbirth. Gaius tells Merlin that he thinks the Black Knight is Tristan De Bois, brought back from the dead to exact his revenge. Merlin discovers that there is only one way to kill a vengeance wraith – with a sword forged in a dragon's breath. But is it too late for Arthur who, determined not to lose any more of his knights, is due to fight the Black Knight the following day?

Separated from the Doctor, Clara discovers a new menace from another dimension. But how do you hide when even the walls are no protection? With people to save and the Doctor trapped, Clara goes against an enemy that exists beyond human perception.

PC Penhale spreads pandemonium throughout the village, and Bert pops the question to Jennifer.

[Season Finale] Hakon von Enke, a retired high-ranking Swedish naval officer, vanishes during his daily walk in a forest one morning. Hakon is Linda's father-in-law so when Wallander is approached by his distressed daughter, he can't help but investigate further.

The Lovers' Lane killer is dead. The man accused of killing five people has himself been killed in a prison fight before his trial. But is the case now closed? The body of a young woman on a day trip to Oxford was never found and Morse is convinced that her remains are in Wydam Woods. But will the woods at Wydham yield their secrets to the investigators? Featuring Malcolm Storry (The Last Of The Mohicans) and Michelle Fairley (Births, Marriages And Deaths).