Criminal Minds has introduced us to a wide range of killers, from sickening sexual sadists who make our stomachs churn to lost traumatized souls who end up eliciting our empathy. Of them all, there has always been one kind of killer that never fails to horrify me whenever they are revealed: children. It is always acutely creepier when a child, someone who is supposed to represent innocence and purity, performs the heinous action of killing someone, especially when it's on purpose. There have been a handful of juvenile offenders in Criminal Minds, but there is one in particular whom I would love to see return to the rebooted show, Criminal Minds: Evolution.