Roseanne tries her hand at telephone solicitation while trying to console Becky who had an embarrassing accident in front of the school council.

The village of Carbury, England, in the late 1990s, where a nuclear missile convoy overseen by UNIT 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 and his sword Excalibur.