2/4 The Doctor and Ace explore King Arthur's spaceship deep under Lake Vortigern. (R)
BBC Two except East, South East, Yorkshire
1/4 In Carbury, knights in armour arrive waging a war that began thousands of years ago. (R)
4/4 Davros' new generation of Daleks is destroyed, but once again, their creator escapes.
3/4 An assassin plots to murder Davros and the Doctor admits to Peri they are in great danger.