Children's drama series. The chasm between Marnie and Kyle grows ever wider. She manages to find the Arrow of Truth even though Kyle has hidden it from her. With the darkness now fully infecting her, she takes matters into her own hands with disturbing consequences for her friendship with Kyle. The Zoo try to talk to Marnie and in a moment of lucidity she goes to Nathaniel for help, but he finds the evil within her is now too powerful, even for him.