The Doctor and Sarah head to the meditation centre to try and get the crystal back while Lupton prepares to return it to Metebelis Three. But all their plans are disrupted when it is stolen by Tommy.
Quest roles:
Richard Franklin(Mike Yates), Walter Randall(Guard Captain), Christopher Burgess(Barnes), John Dearth(Boss (voice)), John Kane(Tommy), Gareth Hunt(Arak), Geoffrey Morris(Sabor), Jenny Laird(Neska), Joanna Monro(Rega), Kevin Lindsay(Styre / The Marshal), Ysanne Churchman(Alpha Centauri (voice)), Terence Lodge(Orum), Ralph Arliss(Tuar)