The mystery surrounding the strange skull deepens. Thea is slowly succumbing to its influence while the Doctor prepares to battle a creature from mythology.
Quest roles:
Denis Lill(Sir George Hutchinson), Wanda Ventham(Faroon), Scott Fredericks(Boaz), Geoffrey Hinsliff(Fisk), Daphne Heard(Martha Tyler), Edward Evans(Ted Moss), Edward Arthur(Adam Colby), Derek Martin(David Mitchell)