Guest Stars Roger Delgado as The Master (1st) Melville Jones as Guard Donald Eccles as Krasis Ian Collier as Stuart Hyde Wanda Moore as Dr. Ruth Ingram Aidan Murphy as Hippias Marc Boyle as Kronos George Cormack as Dalios Susan Penhaligon as Lakis Michael Walker as Miseus Ingrid Pitt as Galleia Dave Prowse as Minotaur Derek Murcott as Crito Ingrid Bower as Face of Kronos