Gilli (portrayed by Harry Melling) is a young man who attempted to participate in the tournament of Camelot, secretly using his magic to prevail in the tournament. When Merlin spoke with him about his use of magic, he explained that his father had been a sorcerer himself, but had never used his magic out of fear. Gilli decides to compete in the tournament using his full range of skills, his magic being focused through a ring that his father had once possessed. Although Merlin attempted to convince Gilli to withdraw from the tournament before anyone got hurt. Gilli however refused to do so, even after he unintentionally killed his latest opponent, believe that killing Uther would be for the best for all their kind. Knowing that it would be impossible to convince Arthur to work to restore magic to Camelot if magic was used to kill his father, Merlin subtly aided Uther in the fight against Gilli by arranging for Gilli's sword to be stuck in Uther's shield, allowing Uther to prevail. When Merlin confronted Gilli about his attempt to kill Uther, even though he had been about to win the tournament, Gilli acknowledged that he had been wrong. Gilli recognised that his father had disdained magic not out of fear of his power, but out of fear of its ability to corrupt. Acknowledging the wisdom of Merlin's advice to keep his powers secret until the day came when magic would once again be welcomed in Camelot, Gilli departed the kingdom, leaving Merlin reflecting that the two would meet again when magic was once again permitted.
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