Choked to death by her abusive alcoholic father, Jessica Sanders later manifested as an alter ego of her sister Niki, a single parent with her own alcohol issues. Blessed with superhuman strength she quickly dominated her weaker-willed sibling and proceeded to fool Niki’s husband and son, while taking on assassination jobs for the mysterious Linderman. Not afraid to manipulate or even kill to get her way, Jessica continues to mentally dominate her weaker sister throughout the first series. Yes we could have chosen Robert Louis Stevenson’s Dr Jekyll and Mr Hyde, but the Sanders girls are much sexier.