I would have had Gaius die in the last episode of series 4. The next day a plague causes people to die, their skin turning white with dark blue veins. Richard Wilson teamed up with Simon Callow in 2014 for the Playhouse Presents episode “Space Age.” The aging astronauts volunteer for a space mission, opting out of the overpopulated retirement home. Book-Ends: Merlin says in the pilot that without his magic, he might as well die. "Arthur is safe once more!" After the execution of his master, Merlin and Morgana convince Gaius to help cure him and they decide to help him escape. The dragon reveals a prophecy that Mordred would be the one to kill Arthur in the future and advises Merlin to let the boy die. When King Uther orders Prince Arthur to search all Camelot for the sorcerer he believes to have caused the epidemic, only a magic trick saves Merlin from having his book found. Gaius fills in the gaps – the ancient magic which has the power to mirror life can reverse death itself. Merlin is confused on how to deal with the boy, so he asks the great dragon for his advice. Merlin goes back to Gaius with the clues the dragon has given him. Gaius spots the Fomorrah under Merlin's skin and, after paralysing the serpent, removes it with a knife. When Gwen's father exhibits symptoms, Merlin waves Gaius's warning by curing him. Its not that I dislike Richard Wilson but Gaius really had outlived his usefulness in the series at that point and I think he got in the way of Merlin learning about these creatures himself and also from the Dragon being his mentor. But mostly it’s the episode where Merlin kills … Merlin has some tough decisions to make that could see his world changed for ever. In this episode, he loses it. This episode is the first to look at the lengths Merlin will go to save Arthur, an issue which raises it’s head throughout the show as Merlin is forced to make increasingly murky decisions to keep the Once and Future King alive. The next day a plague causes people to die, their skin turning white with dark blue veins. "We have the old Merlin back," gushes Gwen. With Colin Morgan, Angel Coulby, Bradley James, Katie McGrath. fdarcy Gauis to me is conflicted, he loves Merlin, Arthur and Gwen, I know that in 4:9 he did not take up for Gwen and that in 5:2 he willingly pleaded for Sefa. One of the best relationships on Merlin was between the series' eponymous protagonist and Camelot's king. But there is a price to pay: in order to save a life, a life must be taken. Compared by many to be two sides of the same coin, Merlin and Arthur's relationship was at the heart of the show. Directed by James Hawes. The dark sorceress Nimueh casts a spell on a dragon egg she throws into the castle's water. Gaius guides Merlin through Camelot, acting as a mentor. The Knights and Saxons fight, with Arthur and Mordred putting their dragon-forged swords to good use. 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