Katherine Turner is a pretty young woman in her late twenties and the worst Medusa case among the survivors, being the most infected one of them all. Since their encounter she acts in a motherly way towards Tim Laisenbach, the youngest of them being only a little boy. Before becoming infected, Katherine was an alcoholic and was prone to abuse her son Michael, until he was taken away from her and placed in foster care. This events shook her greatly and left her with bitter disgust for herself, prompting her to try to be a true mother for Tim as she wasn't for her son.

Later in the story, the Medusa infection in her completely consumes her body, which starts to crumble apart during an assault of monstrous creatures. On the verge of death she deliberately stabs herself, triggering the Medusa inside her and becoming what she believed was the figure of an ideal mother, a harpy-like creature. While still capable of recognizing Tim and the other survivors, she herself was nothing more than what Katherine's heart and memories were at the moment of her death. Nevertheless, she still showed the same attachment to Tim and fought against the monsters threatening him, though she was greatly wounded and was left with the boy to recover. Later captured by Zeus' soldiers, she was set free during the end.

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