WARNING: The following contains spoilers for Doctor Who: Flux, "Chapter Six: The Vanquishers," which aired Sunday, Nov. 28 on BBC.
The Chris Chibnall era of Doctor Who is the first run of the modern series that sought to push the boundaries of storytelling. From casting the first female and Black Doctors with Jodie Whittaker and Jo Martin, respectively, to creating new memorable aliens like the Pting and reinventing the core mythology of Doctor Who with the Timeless Child, Chibnall had a pretty ambitious creative vision. Everything he built up to from Season 11 culminated in the six-episode event Doctor Who: Flux.
In many ways, Doctor Who: Flux is meant to be the grand finale of the Timeless Child storyline, leading into the three upcoming specials that will lead to the 13th Doctor's regeneration. While it does succeed in further developing the Doctor's missing past, it also leaves a lot of questions unanswered. This is not helped by the fact that Chibnall introduced a lot of new characters in Doctor Who: Flux whose relevance are still left in the air at best and whose storylines are left unconcluded at worst. The biggest issue is how they all tie into the Timeless Child storyline at all and whether or not those loose threads will be tied up in the upcoming specials.
What is the Significance of Bel and Vinder?
As entertaining as Bel and Vinder are as characters, they also didn't add much to the overall story -- apart from being at the right place at the right time to help the Doctor defeat the Sontarans in the Doctor Who: Flux finale. At best, there was one recurring theory amongst Doctor Who fans that Bel and Vinder could be the Timeless Child's parents, which would've afforded their characters greater story significance. While Bel was revealed to be pregnant, it was never revealed if her baby is the future Timeless Child. This is one question that hopefully gets addressed in the upcoming specials so that Bel, Vinder and baby aren't just one-off characters.
Why Did the Grand Serpent Work With the Sontarans?
Related to Bel and Vinder is the Grand Serpent, whom they both served on their home planet. Who exactly is the Grand Serpent and is he really from the same planet as Bel and Vinder? Given that he has unique abilities that neither Bel nor Vinder possess, there's a high possibility he infiltrated their planet in a similar way he did Earth when he cofounded the United Nations Intelligence Taskforce (UNIT) under the alias of Prentis.
The recurring theme with the Grand Serpent is that he is a man of questionable character who forms alliances with dangerous enemies as a means to his own ends. One of the dangerous enemies he forms an alliance with in Doctor Who: Flux is the Sontarans, but his motive is never disclosed. What did he have to gain from helping the Sontarans invade Earth? Hopefully this thread is cleared up by the time the 13th Doctor regenerates.
What Was the Long Game of the Ravagers?
Two of the newest characters introduced in Doctor Who: Flux are the Ravagers Swarm and Azure. They are two of the most calculating villains created for the 13th Doctor who can give the Master a run for the title of Archenemy. At one point, it was even speculated that Swarm could be an earlier incarnation of the Master given how similar his personality is to the villainous Time Lord.
While he wasn't revealed to be the Master, he and Azure still had a master plan of sorts that ultimately never saw fruition due to the Doctor's intervention. As time-traveling aliens themselves, they formed an alliance with the entity of Time itself, though it is unknown for what reasons. At best, they referred to Time as their "savior," but they were seemingly killed before it could be revealed what Time was meant to save them from.
Why Exactly is Time in Doctor Who: Flux?
Perhaps the biggest reveal of Doctor Who: Flux is that the Time Lords were never in control of time as originally believed. They could manipulate time and travel through it, but they never actually created nor owned it. Instead, Time is revealed to be an evil, sentient force that is imprisoned somewhere on a planet also called Time. It is also controlled by a group of women known as the Mouri within the Temple of Atropos. It is unknown where in the multiverse the planet Time resides or why letting Time run wild would result in the destruction of space. All that's teased is that we haven't seen the last of Time and it is hinted to make a return in the upcoming specials.
Why Is the Doctor No Longer Interested in Learning Her Past?
The most baffling outcome of Doctor Who: Flux is the 13th Doctor choosing not to find out her missing past after spending the entire series in search of it. This decision is especially puzzling considering her being in the dark about her own past endangering the lives of her companions, and even an entire universe.
Between the events of Season 12 and Flux, it's been clear the Doctor's past history with the Division created the chain of events that built up to her adoptive mother, Tecteun, attempting to destroy an entire universe to cover her tracks. It's rather irresponsible of the Doctor to decide to "lock away" her darkest secret until the moment is right, which could very well be leaving the universe -- what's left of it -- vulnerable to whatever new catastrophic event the Master is planning.
Is Division Gone for Good?
Despite Division appearing for the first time in Doctor Who: Flux, it didn't seem much bigger than a satellite floating in the multiverse. Even with the reputation of having various alien species in its employ and not just Gallifreyans, none of the other Division operatives apart from Tecteun, the Weeping Angels, an Ood and Karvanista are anywhere to be seen.
Did Division disband a long while back or are the other operatives still out there carrying out missions? With Tecteun dead, it doesn't seem as though Division has a leader or much of a purpose anymore. Then again, the Master could be recruiting some of those members against the Doctor. It's definitely a thread that needs to be wrapped up before the 13th Doctor regenerates.
What Is the State of the Post-Flux Universe?
Two Flux events destroyed significant portions of the universe that were seemingly left unrepaired by the season finale. Even the Sontarans, Cybermen and Daleks were seemingly annihilated in the final Flux event, yet the latter are back for the New Year's special. To quote the Sontaran commanders, "What is happening?" is the only question left to be answered regarding the current state of the universe.