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Grendel's mother was a fictional character from the epic story Beowulf, the nameless mother of the monster Grendel. As she was a part of Earth mythology, she existed in the Land of Fiction. When the Cybermen attempted to conquer the Land after being brought there by Zoe Heriot, the Cyber-Controller was attacked by Grendel's mother, who tore his limbs off before the Lady of the Lake beheaded him. (AUDIO: Legend of the Cybermen)