The Doctor Who season 11 finale featured the return of this season's first villain - Tzim-Sha, the would-be ruler of the Stenza who the Doctor insists on calling "Tim Shaw" - but it's led to even more questions. It's been over 3,000 years since Tim Shaw last crossed paths with the Doctor and her friends, and his mind has fractured over the course of the millennia. He's gone full-on megalomaniac, seeking to destroy anyone who ever opposed the Stenza - even though the episode subtly implies the Stenza Empire has long since collapsed.
New showrunner Chris Chibnall and Thirteenth Doctor Jodie Whittaker have had a strong start. Quality was consistent, but the absence of an overarching narrative meant it didn't quite live up to its potential. The real star of this season was undoubtedly Bradley Walsh's Graham, and the relationship between Graham and his grandson, Ryan, came to a head in the final episode. The theme of "family" was at the heart of Doctor Who season 11, and that also came to a head in the final scenes; the Doctor happily decided her friends have become her new "fam."
Related: Who Are The Doctor's Family?
The Doctor Who season 11 finale had the rather unusual title, "The Battle of Ranskoor Av Kolos." It was named after the ravaged world that the TARDIS arrived on, although - in typical Doctor Who fashion - the Doctor and her friends arrived when the battle was already over. They had to deal with the aftermath - and save the Earth from destruction.
18. Who Are The Ux?
The Doctor Who season 11 finale introduced a brand new alien race, the Ux. The Ux are a unique race, in that they possess the psychic ability to restructure reality itself with force of will. They can only be found on three planets in the universe, and only two exist at any one time. The Doctor describes them as "faith driven dimensional engineers," and two Ux are able to focus their power to literally tear holes in spacetime. The power of the Ux, combined with the technology of the Stenza, is able to compress entire worlds into stasis crystals. Horrifically, though, this is an act of planetary genocide - the instant eradication of all life on the planet.
17. How Did The Ux Possess Such Power?
One significantly important unanswered question, of course, is just how the Ux possess such powers. It seems the planet of Ranskoor Av Kolos is a maelstrom of psychic energy; presumably the Ux evolved in a natural state of synergy with the planet, and they became able to tap into its power. The Ux faith appears to periodically involve using their powers to restructure the planet's surface, which would perhaps stir up the maelstrom even further.
16. How Do The Ux Reproduce?
Not to be crude, but - if there are only ever two Ux at any one time, how do they reproduce? Perhaps the answer lies in their reality-manipulation power; when one of the Ux is dying, perhaps the other uses their power to revert them to childhood and begin again. But this is something that's not discussed in the Doctor Who season 11 finale, and likely will go unanswered for some time.
15. How Did Tim Shaw Get To Ranskoor Av Kilos?
Tim Shaw was introduced as the villain of "The Woman Who Fell To Earth," the Doctor Who season 11 premiere. He'd headed to Earth in order to hunt down a random human and prove himself worthy to rule the Stenza; naturally, the Doctor didn't take well to the idea of aliens using Earth as a hunting ground. When the episode ended, the badly-injured Tim Shaw teleported away, just as DNA bombs exploded in his body. It seems the energy released by the DNA bombs boosted the teleportation, and he arrived in a distant world - perhaps drawn to Ranskoor Av Kilos due to its reality distortions.
14. Were There Any Clues To Point To Tim Shaw's Return?
The first two episodes of Doctor Who season 11 had indeed hinted that the Stenza would be a recurring threat; they were introduced back in "The Woman Who Fell To Earth," and were revealed to be the villains behind the destruction of the planet Desolation in "The Ghost Monument." There's been no mention of the Stenza since, though, and there have been absolutely no hints that Tim Shaw in particular would return.
13. Why Did The Ux Think That Tim Shaw Was Their Creator?
The Ux religion apparently foretells a time when their deity, the Creator, will return to them. Tim Shaw's materialization seems to have matched with the Ux prophesies, and he was able to persuade them he really was their god. It's interesting to note that the younger, and less pious, Ux was restrained - suggesting he doubted Tim Shaw, but was overpowered.