This week's episode of Doctor Who was a very different affair to Listen. Time Heist didn't have the treasure trove of revelations like last week, but that wasn't the purpose of this episode. Instead we had a well-paced, self-contained adventure that delivered plenty of fun, action and mystery. It was also an episode that left us with some interesting questions, one of which the Doctor asked himself. Time Heist continued to delve deep into the relationship between the Doctor and Clara, examining their maturing relationship both as friends and conflicted allies. It's not always been an easy ride for these two and new character Psi was quick to question their dynamic, asking a question that we the audience may have had in the back of our minds. There are also some questions about the supporting characters in this week's episode. Psi and Saibra were a strong support act to the Doctor and Clara and Ms Delphox was a villain steeped in mystery, but there's still more we want to learn about them. Added to that a connection to Doctor Who lore and the return of a long-running mystery and we have some big questions to ask. So after the slick, timey-wimey action of Time Heist, let's take a look at some of those burning questions. Click 'NEXT' for number eight...