Doctor Who: Peter Capaldi’s 12 Best Performances As The Twelfth Doctor

Before we get to the really interesting part of the dramatic Master/Missy (delete where applicable) reveal, the Doctor has to first deal with the "mess of chemicals" that is Clara following the sudden death of her boyfriend Danny.

Whilst standing on the precipice of a dream-state volcano (more nightmarish wouldn't you say?), Clara's behaviour comes off less genuinely grief-stricken and more a spoilt brat who demands to get her way. Despite the Doctor setting this up as a test to see how far would Clara would be willing to go, you can imagine Capaldi's Doctor still resolutely refusing to give in to her churlishness had they been on a real lava-spewing volcano.

As if to highlight that fact, the Doctor tells Clara to "cut out the whining" and to "buck up and give it some attitude". The Doctor cares deeply for Clara but his tough love is in keeping with this acerbic incarnation.

There's instant chemistry, quite literally, when the Doctor and his arch-frenemy finally come face-to-face when she goes in for a full-on snog with him. To be honest, the Clara-Danny story is a mere sideshow to the box office of Gomez's flirtatious-manipulator and Capaldi's terrified "ranting Scotsman" - just look at his eyes bulge in terror at the end of this episode.

Also it shows how distinctly alien the Twelfth Doctor is when he doesn't get the cheeky/perverted (delete where applicable) concept of using dark water in swimming pools.