A really exciting way to kick off Season 26. Battlefield is like a legacy sequel before legacy sequels were cool. It's one big throwback to the Pertwee era, with the original Brigadier, UNIT, and even Bessie. There's even the neat introduction of Brigadier Bambera, who is unbelievably cool, and feels ahead of her time, being a fearless black leader of a secret organisation during the late 80s, when there weren't as many prominent black female characters.

I love the idea of a future Doctor being Merlin, and the Arthurian legends adds an interesting mystical vibes to proceedings. Morgaine is an excellent one-off antagonist too; she feels like more than a match for the Doctor.