The Mummy on The Orient Express is an entertaining, insightful and all around great episode. It explores even more what I wanted the most this Series, The Doctor. Capaldi's Doctor truly stands out from the rest. He's unpredictable, will do anything to solve mysteries even if it will endanger other lives, and just downright rude. He isn't the hero type, but he will surely be the one to the job or mission intelligently. He also doesn't rather care about other people who don't seem to be important and is more interested and focused on the objective or mission itself. Clara somewhat begins to rise as a better companion with Capaldi because her role this series now is to cope with Capaldi's attitude and personality and at the same time to show him and guide him on the way. The chemistry between the two builds up in this episode, there was a certain time when Clara did not know whether to trust the Doctor or not (after the events of Kill The Moon) and what she did just shows how much she has developed throughout this series. The visuals in the episode were great as well. The Mummy looked certainly terrifying and the train looked fantastic. The acting was top notch and the dialogue was smart. As the series progresses near the series finale the episodes seem to get better and better.
With solid performances, striking visuals, great storytelling, and Capaldi being a stand out from all the other doctors and brings something special. This is one of the best episodes in Series 8 so far right beside Listen.
Verdict: 8.9/10