Karin Matthews (played by Sarah-Jane Redmond) is the therapist of teenagers Bobby Rich and Lisa Baiocchi, possesses the ability to control trees. Abused as a child, Matthews encourages her patients to empower themselves against others in positions of authority. However, she is trapped by the memories of her own abusive father, who died twenty years prior, and uses her supernatural ability to murder Bobby's stepfather and later, Lisa's father. When Karin attempts to kill Mulder by dragging him underground, she is killed by an orchard caretaker. (TXF: "Schizogeny")

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