A creature in a hood called Colony Sarff visits a number of places and asks, "Where is the Doctor?" until he visits the Sisterhood of Karn, where they ask him for the message from Davros. Back on Earth, Clara spots a jetliner suspended in the sky and races to U.N.I.T. to discover what is causing it.
Clara tracks the Doctor to the year 1138 in Essex and Missy vortex manipulators them there. Colony Sarff tracks the Doctor, by following his friends. He summons the Doctor to see Davros and throws him the sonic-screwdriver that the Doctor left with the young boy in the battlefield. The Doctor agrees, then Clara and Missy insist on traveling with him.
The Doctor appears before Davros where, Davros plays back old Doctor footage of their squabbles. Meanwhile Missy and Clara discover that the gravity isn't right for a space station, it's to perfect. Turns out they're on the planet where it all started, the home of the Daleks, Skaro.
Doctor: Your chances of survival are 1 in a thousand, so here's what you do. You forget the thousand and you concentrate on the one.
Colony Sarff: Tell the Doctor, Davros knows, Davros remembers. Tell him he must face Davros one last time.
Missy: See that couple over there? You're the puppy.
Doctor: I've also introduced the word 'dude', several centuries early.
Missy: Wait a sec, Davros is your arch-enemy now? I'll scratch his eye out.
Next time on Doctor Who: The Witch's Familiar