Doctor Who
Battlefield

The TARDIS materialises in the English countryside near the village of Carbury, where a nuclear missile convoy under the command of UNIT's Brigadier Winifred Bambera has run into difficulties.

Lying on the bed of the nearby Lake Vortigern is a spaceship from another dimension containing the body of King Arthur, supposedly held in suspended animation, and his sword Excalibur.

Ancelyn, a knight from the other dimension, arrives on Earth to aid the King but is followed by his rival Mordred and the latter's mother, a powerful sorceress named Morgaine. They all recognise the Doctor as Merlin - a fact that the Time Lord attributes to events in his own future.