6. Battlefield
From the writer of Remembrance of the Daleks, Battlefield boasts a similar number of strong concepts as that story. While it lacks a narrative cohesion, who couldn't admire an adventure that brings back the beloved Brigadier from retirement and pits the forces of UNIT against figures from Arthurian Legend? In another sparkling fresh idea for the Seventh Doctor's era, Morgaine (played by former companion Jean Marsh) and her knights come from another dimension, in which magic exists alongside science, to our world to look for their old enemy, King Arthur. The serial is also important to Who mythology by containing the revelation that sometime in his future the Doctor will become the legendary Merlin. Perhaps that's a Peter Capaldi episode fans have yet to see? This story is almost the opposite of the Happiness Patrol in that there's not much comment or thematic resonance but simply a cracking adventure with, this time around, a fantastic-looking monster in the Destroyer. The big blue fella sadly does not get much to do but his presence does allow the Brigadier a terrific and heroic moment when he risks his life to shoot him with silver bullets. Of course, this is just the start of the Brigadier's connection with silver (see last year's Death in Heaven for more). https://www.youtube.com/watch?v=tP6T1wcFwms