The BBC have now revealed that a DVD of the 1989 story, Battlefield is set for release. The story, featuring seventh Doctor, Sylvester McCoy, was broadcast back in September 1989, and also included UNIT. You can see the full cover here of the upcoming release here, thanks to Doctor Who Online, and below you can read the synopsis for the story;
The Doctor and Ace receive a mysterious distress signal and land in the Earth village of Carbury, where a nuclear convoy has halted. The Doctor's concern is heightened when knights from another dimension begin to land in the area. Nearby is Lake Voortigen, the mythical resting-place of Excalibur, King Arthur's mystical sword...
But the lake holds a more sinister secret. A spaceship from the same alien dimension lurks under the lake - but does it really contain Arthur's corpse? And what is it that the Witch Queen, Morgaine, is really after?
The disc also has a bunch of special features, which you can see listed below;
From Kingdom to Queen - Jean Marsh In Doctor Who
Past And Future King - Writing 'Battlefield'
Storm Over Avallion - Making 'Battlefield'
Studio Recording - 1st June 1989
Trails and Continuity
The DVD will be released on 29th December 2008, at the RRP price of £19.99.