By Huw Fullerton

Published: Sunday, 28 November 2021 at 12:00 am

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Survivors of the Flux certainly gave Doctor Who fans plenty to think about, with the penultimate chapter of series 13 revealing all sorts of crucial information and setting the scene for a pretty massive finale.

We learned the truth about the Flux, the Division, the history of UNIT (sort of), Joseph Williamson and much more – but with all that information, it was easy to get a little lost (a little like Williamson).

Luckily for you, we were taking notes – so here’s our attempt at answering the biggest post-episode questions.

What is the Flux?

At least one big question got answered before next week’s finale The Vanquishers, as we discovered who unleashed the Flux and why.

Back in Once, Upon Time, the Doctor (Jodie Whittaker) briefly encountered Tecteun (Barbara Flynn) – or “Awsok”, as she was then credited – in the space between universes and was informed that the Flux “wasn’t an accident – it was made, it was placed… because of you.”

Tecteun expands on this when the Doctor again finds herself transported against her will to Division headquarters, which we’re told exists “outside one universe, on the cusp of many more.”

In short, the Doctor departing Division, breaching the border between universes to enter our own, threatened to expose the existence of the Time Lord’s secret police – as Tecteun puts it, “We let a virus into the experiment.”

The Flux was created by Division as a means of destroying our universe and so obliterating any evidence of the Doctor / her shadowy past. It might seem like overkill – wiping out whole galaxies just to keep Division under wraps – but as Tecteun says, Division is “colossal, across space and time” and operates across a multiverse, so wouldn’t think twice about zapping one universe among many.

Where is the Doctor from?

Basically, all we know for sure is that the Doctor isn’t originally from Gallifrey, with everything else up for grabs.

In this week’s episode, we’re reminded that Tecteun found the child who would become the Doctor on a distant world, standing beside a wormhole to another universe.

The implication is that the Doctor is actually from that second universe – but as the Doctor points out, that might just be an assumption. What if she was just visiting the wormhole from this universe, waiting to be collected when Tecteun scooped her up? Or what if she was from somewhere even further away, maybe one of the other universes Tecteun mentions?

Either way, the Doctor is offered the chance to explore that second universe and maybe, just maybe find her true home and people in the process. She doesn’t take Tecteun up on the offer before her stepmother is killed, but we doubt this storyline has been wrapped up just yet.

Why did the Lupari shield break?

Thaddea Graham’s Bel was pulled into Earth’s orbit when Karvanista (Craige Els) and the Lupari fleet needed to fix a breach in their shield-wall, and her borrowed ship was the only one outstanding.

But… why did they need her anyway? In the episode, it seemed like one of the Lupari ships had drifted free, and with no response from the pilot Karvanista grimly pronounced them as “down”. But the ship was still there – so why not remotely control the one a few metres away, rather than the one a few lightyears away?

We’re sure the show can make up some science-wiencey reason but for now, we’ll just have to accept the story needed Bel closer to Earth.

Where is Osgood?

Kate Stewart (Jemma Redgrave) returns in Survivors of the Flux, facing off against Craig Parkinson’s slippery Grand Serpent – though, as we know from 2019 episode Resolution, she wasn’t successful in preventing “Prentis” from dismantling UNIT, leaving Earth alone to attack from a Sontaran fleet (and an opportunist Dalek, of course).

Traditionally, Kate has always come paired on-screen with UNIT’s scientific advisor Osgood and while Ingrid Oliver’s character doesn’t appear here, she is mentioned when Kate contacts her friend to let her know she has to “go dark” to escape the Grand Serpent and – as we learn from the Next Time trailer – launch humanity’s resistance against the Sontaran invasion.

So where is Osgood in all this? Will she too make a surprise comeback next week, back at Kate’s side, or has she too gone into hiding? Fingers crossed the Grand Serpent and his pet snake haven’t caught up with her…

What’s going on with Joseph Williamson?

Real-life historical figure Joseph Williamson (Steve Oram) has been drifting in-and-out of Flux, popping up at different points in time and space – and we finally learn how in Survivors of the Flux, with his excavation project part of a plan to protect Earth from “the destruction to come” and his underground tunnels containing “a dozen doorways [to] a dozen worlds”.

Since Halloween, he explains, “all is flux” and “some of the doorways have changed” – which explains earlier scenes of a frustrated Williamson wandering about, lost, in the tunnels and in the temple of Atropos on the planet Time.

But there’s still an awful lot that’s not clear. Why did these doorways to other worlds suddenly spring up underground in Liverpool? How did Williamson know of their existence in the first place? How does he know about the approaching war for planet Earth? And what’s beyond door number nine, which he describes as containing “endless death”?

What was the Grand Serpent’s plan?

1. Infiltrate UNIT
2. Kill with psychic snakes
3. ?
4. Profit!

OK, to be fair there was a bit more to it than that. It seems like the Grand Serpent, having escaped the ruins of his civilisation (thanks, Flux!) decided to get back to scheming and deliver Earth on a platter to whichever alien nasties were still around in the universe.

He didn’t go back to 1958 and found UNIT, exactly – he just used time travel to insinuate himself within UNIT’s upper structure, dipping in and out of different time periods just enough to build up his position and take control. Kate Stewart speculated that from his perspective, it may have only taken a few hours or days to wind himself throughout UNIT’s history.

Then, firmly in power he was able to shut down UNIT and lower Earth’s remaining defences for his Sontaran paymasters. Simple! Ish.

What’s with the scary house?

I love the house of lungbarrow pic.twitter.com/PMmvyC2kwA

— CHLOVANISTA ???? (@_cosmicangst) November 7, 2021