“Legend of El Cucuy” is a cautionary tale. Laura and her husband Carlos are permissive parents, and their choice to raise their daughter Isabel without discipline has resulted in a very rude, disobedient child. Carlos is having doubts about their behavioral strategy, but Laura is determined to make different choices from their parents. Against his better judgment, Carlos tells Laura about El Cucuy’s origins, and that same night, El Cucuy pays the family a visit.