(from BBC America's web site) Return to Medenham Hall where the battle to save the world from evil is still raging. At the close of the first season, Cassie's aborted baby boy is found alive and growing at a startlingly inhuman rate. His birth has unleashed an onslaught of fallen angels, whose only aim is to slay the mortals around them and gain control of the world as we know it. The human race's only chance for survival rests in the hands of Medenham student, Ella Dee. She is no mere mortal, but even with her mysterious powers, can she alone fight the powers of Hell on earth? As season two opens, Medenham's warrior and savior, Ella (Laura Pyper, Holby City), lies drugged and vulnerable in a psychiatric hospital. Former student and current ghost, Thelma (Jemima Rooper, The Black Dahlia), races to save Ella, knowing full well that it was her selfish deal with fallen angel, Azazeal (Michael Fassbender, 300), that landed Ella where she is now. Thelma's only hope of saving her is enlisting Ella's merely-mortal new boyfriend, Leon (Jamie Davis, Footballers Wive$). Back at school, Headmaster David (Colin Salmon, Die Another Day) is forced to take drastic action to protest Ella's treatment. This leaves the school vulnerable to an evil spirit posing as a teacher, Jez (Sam Troughton, Robin Hood), who uses alpha mean girl, Roxanne (Amber Sainsbury, Murder in Mind), to help him carry out his evil plan. By appearing to Leon in his dreams, Thelma hopes that his feelings for Ella are strong enough to resist Roxanne's bullying demands that they all forget about her and move on. But just as Thelma starts to make progress, Azazeal sends the eerie Perie the Faerie (Katrine De Candole, Casanova) to pose as Ella's new nurse. As Nurse Perie feeds her a drug that drains her telekinetic powers and threatens to leave her totally defenseless, will mere mortal Leon find it in himself to rescue Ella before it's too late?