Mary Collins (played by Eve Myles) was a sorceress and the antagonist of the episode "The Dragon's Call". After her son was executed for using magic, she threatened to kill Prince Arthur in revenge against the king. She killed Lady Helen, who was visiting Camelot to perform for Uther, and assumed Lady Helen's appearance. However, her true form could be revealed in any reflection. Her singing put the entire royal court into an enchanted sleep except Merlin, and he stopped her from killing Arthur by causing a chandelier to fall on her body. As everybody awoke, her true form was seen, and she threw a dagger at Arthur. Merlin saved him and Mary Collins died from her injuries.