A brilliant Time War story and follow up to the previous installment. While it does raise a few questions as to how the TARDIS team ended up in this situation, the story that follows more than makes up for it with a brilliant tale of amnesia, corruption, war and profit! A brilliant use of the confusing nature of the Time War, and having Hattie Morahan appear in the cast kept me guessing throughout, as it was clear she wasn't playing Helen, but that answer came right at the end and really shocked me at first! An absolutely brilliant twist!