Mulder and Scully investigate a town where people are being killed by trees.
Abusive Parents: Apparently the motive for the murders. Played With: the teenage suspects' parents weren't abusive; but their therapist's father was.
Body Horror: Of a kind; a man cuts a tree with an axe and blood pours from the wound.
Calling the Old Man Out: Invoked. Karin, projecting her abusive childhood on other kids, coerces them into 'standing up to' their fathers, regardless of whether said fathers are actually abusive.
Creepy Basement: Karin used to be locked up in one when she was small and she in turn locks there another girl who has to watch her aunt's murder and her body through a small window. Moreover, there is Karin's fatherís body covered in tree roots in the cellar.
Hope Spot: A girl, trapped in a cellar, sees Scully and Mulder through a small window, but they don't notice her, and drive away. Later, the girl calls to her aunt, who finds her and tries to save her, but is killed before she can do so.