The ninth series of the British science fiction extends to an adventure of Vikings, Ghosts and the Daleks. Meanwhile the Doctor is faced with Missy who is ready to plague him again.
As we all reel back from the last episode, you could forgive the writers for giving us a more subdued episode. Instead, they pull all the stops out, giving Peter Capaldi a one-man show that changes everything we thought we knew about the Doctor.
This episode was gold dust for fans of Moffat's fanbait mysteries, which, I uncharitably feel, are beginning to take on a slightly mechanistic air, like the scriptwriter equivalent of search-engine optimisation.
A near-perfect hour of Doctor Who that has all the attributes of a superb standalone episode, but instead works to make the previous hour more meaningful while also establishing the stakes upon which the season will end.
"Heaven Sent" is not only the best episode of Doctor Who this season, it's easily one of the best hours of television produced in the now decade-long revival era.
As is often the case with the best Steven Moffat scripts, it takes at least a second watch for the full brilliance of "Heaven Sent" to become apparent.