This was very much so my type of Dr. Who episode. I am a fan of Dr. Who episode that take place in the distant future or on other planets. Classic Sci-Fi with aliens that are new and unique, fun plot twists, and futuristic worlds are my favorite type of Sci-Fi experiences. Dr. Who deliver that in full with a plot twist you will never see coming, amazing aliens (done like Star Wars Original, they are not all CGI and that makes them top line and interesting), and the connections made emotionally push me further into the story. I can't help but feel like I have become addicted.
If you love Sci-Fi, from aliens to alternate worlds you'll love Dr. Who. To be frank this series is not just Sci-Fi, but also Historical, Mystery, Thriller and Adventure, and even Paranormal at times. It encompasses everything you love about watching and reading.