The last time the Doctor ceased to use the screwdriver was in his fifth incarnation, something which continued up until the final episode of the original series' run. The series also featured the Doctor replacing his sonic screwdriver with a pair of sonic sunglasses. Episode 10 onwards saw the Doctor wearing a red velvet jacket with a white shirt and black trousers, resuming a closer look to that of series 8.

The series also featured the Doctor wearing t-shirts in place of his shirt, often with a pair of plaid trousers. The series saw Peter Capaldi's Twelfth Doctor maintain the new outfit seen in Last Christmas, wearing a dark blue hoodie over a black jumper, along with his jacket, trousers and shoes from the previous series. The special prequel was entitled The Doctor's Meditation. This screening was only shown in Russia, Canada, the United States of America and Denmark. A prequel scene to this series was shown at the end of this event. Series 8 episodes Dark Water and Death in Heaven were shown in cinemas in 3D as a two-night event on the 15th and 16th September as a run-up to prepare for series 9. Sometimes things happen that they can't come back from.' However, Clara went on to appear as a hallucination in episode 11 and then return alive in episode 12, but her ultimate fate remained unaltered. I don't want to go into the details of it, but it's sad.', also telling that she wouldn't return, 'Sometimes people can't come back. Obviously we're not going to give away any details but it will happen at some point this season.' Capaldi then revealed that the character of Clara would be leaving during episode 10 Face the Raven, adding that 'It's a sad one, gripping and very strange.' also saying that ' it's the end of the line for Clara Oswald played by Jenna Coleman who's been my companion for the last two years. It has been in the works for a very long time, Steven and I sat down a year ago, a year and a half ago and tried to work out the best place to do it and the best place in which to tell a really good story. She said about the matter: 'I have left the TARDIS and I've filmed my last scenes.

This was Peter Capaldi's second series as the Twelfth Doctor and Jenna Coleman's third as Clara Oswald, whose inclusion in series 9 marked her as the longest running companion of the BBC Wales series to date. The regular series consisted of 12 episodes. The series began filming on 5 January 2015, for an airdate on 19 September 2015. The season consisted of ten stories and fourteen episodes.

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