I found Massacre a little pedestrian in the most part, pure historicals are often not quite as fun as a standard story. I'm always amazed how many Doctor Who plots revolve around the Doctor having a doppelganger or the Doctor disguising himself in some way.

The last 10 minutes of this story beat the rest in terms of quality easily. Just as you think Steven is about to storm out in a fit of moral outrage, a new character joins the team. We were made to think about the consequences of death encountered on The Doctor's travels, the responsibilities of time travelers and look back nostalgically at The Doctor's former companions.

I am starting to feel a bit sorry for Hartnell when he misremembers Susan as "Sue" and has his same old problem with Chesterton/"Chetterton".