Number 20:
City of Death (1979)

The star of this episode, if you don't count the sparkling dialogue, is Dudley Simpson. He rises to the occasion magnificently, giving us one of his finest scores. There are plenty of gaps for him to exploit as we get lots of sequences of the Doctor and Romana running round Paris, making the most of the foreign location shoots.

Witty dialogue, well played by the whole cast, lovely locations, marvellous modelwork, my favourite story. I can't really be objective about this one. It's all absolutely marvellous!