Carbury Incident

In 1997, Morgaine led a group of knights, including her son Mordred, from their universe to Earth in search of King Arthur. Morgaine believed Arthur had survived their last battle when in truth he had perished, with only his long-decayed remains hidden on Earth. Morgaine's forces were confronted by a UNIT convoy who had been transporting a nuclear weapon through Carbury led by Brigadier Bambera, who were aided by the Seventh Doctor and Ace. The Doctor's involvement led to Bambera requesting the aid of retired Brigadier Lethbridge-Stewart. (TV: Battlefield)