An excellent, imaginative, fast-paced finale of the first box set. The plot imaginative and well paced, with twists that really kept me on the edge of my seat. The overall concept is well done, and doesn't turn into white noise that plots like this can. The voice acting is excellent, with actors that really know their characters. Jacob Dudman and Safiyya Ingar still have great chemistry, to the point that it's a shame we can't see this play out in live action. Valarie Lockwood is quickly becoming my favourite Eleventh Doctor companion. The sound design is still top-notch. The music on this release really was exceptional, to the point I wish there was a soundtrack released. This finale really put a great cap on this excellent box set.