Recently been receiving enquiries about that off the cuff tweet about the planets in the title sequence. I was talking to the title designer about changing the Death In Heaven titles (Clara first) - (not my idea, just working on the execution of it). She told me that every planet comes from a different episode of the show and that if you look carefully, you can identify what is from where. Seemed cool, so I mentioned it, thinking it might be an entertaining #TrivialPursuit.