The Doctor and Donna find themselves on an icy planet known as the Ood-Sphere. There they discover what drove the Ood to be a servant race. Can they free them before it's too late?moreless
Then barbiturates are stolen from Raif and Georgina Canning's veterinary surgery and the district nurse is found in her crashed car in a confused state. Barnaby and Troy dash to the Manor, fearing the drugs theft may be connected to the death threats - but they find Melissa is already lying dead by the swimming pool with a syringe in her stomach. Now they have a murderer to find.