After Gaius helped him escape, Balinor stayed at the village of … Arthur's stance on the subject of magic was also explored in the second season.

Arthur is pressured into an arranged marriage with a visiting princess, but there's more to her than mere gracelessness and a taste for frogs. In the following episode, "A Herald of a New Age", Elyan was possessed by the spirit of a dead Druid boy after disturbing his resting place. ', and finally she is crowned Queen of Camelot. With the aid of Morgause, Morgana uses her magic within the castle walls on several occasions to kill her brother, however she constantly fails. Gwaine also came with Arthur to search for Merlin after he'd been ordered by Morgana to kill Arthur. He temporarily replaces Merlin as Prince Arthur's manservant after Merlin goes missing. The "Queen of Hearts" episode is purely about Arthur's love for Gwen. When she realises that Arthur plans to use a sorcerer to save Uther, Morgana uses her magic to enchant Uther's necklace to cause her father's demise. So due to his compassion, Arthur and his remaining knights try to get there, but openly (not for Morgana) using Annis' kingdom instead. She has not been seen since, but has been mentioned in The Crystal Cave, when Morgana's true parentage was revealed. He was only stopped when Merlin intervened, who tearfully claimed that Morgause had been lying and faked the story. In the premiere episode of the fourth series, "The Darkest Hour", Lancelot still held his position as a knight and was one of those who accompanied Arthur in the quest to close the veil between the realms of the living and the dead, which had been torn open by Morgana in her quest for revenge against Camelot. Three years later, Sir Gawain's garrison goes missing, and Elyan arrives back from the search party disappointed, with no sign of Gawain, Percival or any of the men. Charlene McKenna, who plays Lamia, was best known for her role as a Hard-Drinking Party Girl on Raw or else other Genki Girl roles. During the battle, Morgana activates the enchantment, and it momentarily seems that Arthur may lose as Annis's and Arthur's armies watch on in shock, however Arthur miraculously wins. Morgana incapitates Merlin as she moves to kill Arthur, but is stabbed in the back by Mordred. She begins to build her Saxon army, and uses her men to help her hunt down Alator of the Catha, who knows Emrys' true identity.

George (portrayed by Leander Deeny) is a servant in Camelot. It is revealed in "The Last Dragonlord" that she cared for the fugitive dragonlord Balinor, who turns out to be Merlin's father. She therefore refused was hanged. Merlin consequently places it inside a stone.

Noting that Merlin's clemency reflected what he would become in future, the Dragon agreed, speculating that his and Merlin's paths will cross again. In the subsequent fight, both the troll and Jonas were slain by Arthur assisted by Merlin's magic. To prevent an all out war, Arthur chooses to face one of Annis' warriors in single combat; if Arthur wins, Annis will leave Camelot in peace, however if Arthur loses, Camelot will fall. He cared for Uther and as Arthur he moaned his father's death. In the fourth-season finale, "The Sword in the Stone, Part Two", Agravaine was chased into a series of caves by Kilgharrah. However Finna kills herself to avoid breaking under Morgana's torture, once again thwarting Morgana's plans to find out who Emrys truly is. Her execution resulted in Mordred's defection to Morgana and the Saxons, bringing about their foretold alliance. After another attack by the griffin, Arthur sped up Lancelot's training in order for him to join the other knights in the coming battle against the creature. When Arthur crossed the bridge on his quest for the Trident, Grettir noticed the Phoenix Eye on his wrist and was evidently aware of its true purpose, though he made no attempt to warn Arthur of its detrimental effect.