A solid, well-paced serial that was mighty enjoyable, with an engaging new one-off character (with a classically classic Who terrible American accent!) The relationship between the Doctor and the Master was interesting, and the end of episode three had a wonderful scene that I've only seen before now in Tumblr GIFs talking about the thoschei relationship - oh, what fun! This serial lived up to it's reputation, and I recommend it wholeheartedly.