The Doctor descends into the Primitive city to try and find Jo while the colonists receive a visit from the Adjudicator.
Quest roles:
John Ringham(Ashe), Bernard Kay(Caldwell), Roy Skelton(Dalek (voice)), Pat Gorman(Pilot), Roger Delgado(The Master), Helen Worth(Mary Ashe), Morris Perry(Dent), Tony Caunter(Jackson), John Tordoff(Alec Leeson), Norman Atkyns(Rear Admiral), Roy Heymann(Alien Priest), Nicholas Pennell(Winton)