Similarity to New Series themes: Many Whovians will be familiar with the haunting soliloquy Hartnell delivers when Steven leaves the TARDIS on Wimbledon Common at the conclusion of the story. However, it's not the standard, feisty, confident Hartnell we've come to expect, nor even the same decisive Doctor of the past four episodes. It's the first ever appearance of the Lonely God, a mere forty-two (Oh boy, there's a draw for you!) years before Russell T. Davies coined the phrase. I don't care what anyone says, I defy you to tell me Hartnell has ever been better.
It's incredible upon first listening (true, the first time I've ever listened to this story despite reading the Target novelisation in 1993) how similar many of these methods are reiterated in the New Series. Next up for Moffat et al: a return for the pure historical?
Intensity: It's got Steven in it, so it's likely going to be rather erm, focused... Most of the dialogue is delivered with almost Shatner-like intensity, spat/spoken/shouted/whispered as if the lines are lethal projectiles. This only adds to the serial, making you appreciate simply how much is at stake in a historical episode about which not many people are aware. In order to make this sink in to the audience, Lucarotti and Tosh had to make identifiable characters to stop us from saying "Yeah, but so what"? Remember too, that this has so much gravitas because of its context, transposed between two historicals penned by Donald Cotton.
In a word: Prescient.