Peter Capaldi and Pearl Mackie filming 'Doctor Who' Season 10 in Cardiff last week. It'll be Capaldi's last season. Credit: Huw Evans/REX/Shutterstock A few days after Doctor Who fans lost Sir ...

"Smile" was also the first outer-space voyage for a new Who companion — in this case Bill Potts (Pearl Mackie), doomed friend of the 12th Doctor (Peter Capaldi). Older fans may also spot a ...