Law & Order: Special Victims Unit has featured many terrifying criminals over its 24 seasons. Some of the most horrifying include Hunter Mazelon, a juvenile delinquent who sexually assaults older women, Bart Ganzel, who poisons women in his escort service and frames Captain Cragen for murder, and Andre Bushido, who engages in animal smuggling and human trafficking. Other memorable villains include Merritt Rook, William Lewis, Victor Gitano, Sheila Porter, Rob Miller, Lowell Harris, Dr. Carl Rudnick, and Dr. Greg Yates. Each of these criminals puts Olivia Benson and her team through intense and dangerous situations.