Sarah Jane Smith arrives at the home of her Aunt Lavinia in the cozy village of Moreton Harwood, only to find that Lavinia is nowhere to be found and that the Doctor has left her a parting gift in K·9 Mark III. With the help of K·9 and Lavinia's young ward Brendan Richards, Sarah Jane starts investigating her aunt's disappearance. In the process, they discover that Moreton Harwood is home to a coven worshipping the pagan god Hecate and preparing for a human sacrifice...
Elenco: Elisabeth Sladen , John Leeson , Bill Fraser , Ian Sears , Colin Jeavons , Sean Chapman , Mary Wimbush , Linda Polan , Gillian Martell , Neville Barber , John Quarmby , Nigel Gregory , Stephen Oxley .