Space. It’ll kill you if you don’t tread carefully. Lucky you’ve got me on hand, eh? Come with me now, because we’re going to explore the murky and sinister world of ‘Oxygen’ – a tale of corporate greed and sentient workwear, but also replete with IMPORTANT CLUES AND SIGNS that indicate the delights (and the horrors) that still await us.
This week, you’ll find it’s mostly about the First Doctor. Let’s take a look at that skull.

Count the stars. It’s not just the number, it’s the way they’re grouped. Not only does each star refer to a different Doctor, they also refer specifically to regeneration and a number of other things. Don’t believe me? Just watch:

You will note:
– The line that tracks the Second Doctor’s transition to the Third
– The two ‘eyes’ that represent the show in the 1980s and in its post-Y2K revival, and the Eighth Doctor’s uncomfortable positioning between both (but on the left hand side, clearly tying him to the ‘old’ era)
– The placement of the Fourth Doctor at the top of the triangle, or pyramid, signifying ‘Pyramids of Mars’
– The identical placement of the Twelfth Doctor at the top of a similar pyramid, indicating ‘The Pyramid at the End of the World’, in which the Doctor is due to regenerate
– The two tangential lines that lead down below the Tenth Doctor, indicating the split path followed by his metacrisis duplicate
– The six lines across the bottom: this should be obvious
Screens figure big this week, as you’ll see here.

First: note the five figures shown on the monitoring display. This refers to five Doctors, but not the five you were expecting. The Second Doctor is first: We know this because the first figure is directly beneath the word ‘POWER’, which is thus a reference to ‘Power of the Daleks’.
Let’s assume that the subsequent words each correspond to the separate figures. The words ‘CORE’ and ‘COOLANT’ both refer to ‘Inferno’, the Third Doctor story that saw a group of scientists who were endeavouring to drill down to the Earth’s core, which is flooded by coolant in order to abate the disaster. ‘And ‘SYSTEM’ refers to System Wipe, an Eleventh Doctor novella.
If we group these numbers together, including the last one – to which I’ll come in a moment – we get this:

Look at that number. Study it hard. Memorise it if you can. We’ll return to it later.
Let’s get back to that fifth figure for a moment. He doesn’t have a word of his own, but this is the First Doctor. And it is the numbers you really need to examine, if you want to know why – so let’s zoom in. (All right Mr. DeMille, I’m ready for my close-up.)

Macomb, Illinois, I hear you ask? I have my reasons. You can rearrange them to form ‘Albinic loom sim’, a clear and unambiguous reference to the events of Lungbarrow. And this week’s episode was about breathing. I’m sure your minds are blown, so here’s a GIF of a dancing panda, just to bring you down to normality for a second.

—
Maps next. Specifically this one.

Note the presence of green brackets – denoting the Zombies’ intended location – around the section marked A6: specifically, the idea of death, represented here by green brackets, surrounding a number 6? Something to do with the words GREEN and DEATH? A SIX-PART STORY, PERCHANCE?
Hmmm. I’ll let you figure that one out.
We can take this further. Because each number refers to a separate story, as denoted by their different parts. Specifically
Section 11 – The Daleks’ Master Plan (twelve parts, minus the disallowed ‘Destruction of Time’
Section 07 – Marco Polo (seven parts)
Section 06 – The Web Planet (six parts)
Section 04 – The Gunslingers (four parts)
Section 03 – Planet of Giants (three parts)
And what do those all have in common, hmm? And what do they have in connection with ‘The Green Death’? I’ll let you figure that out. I’m not doing all your homework for you, you’re quite old enough.
But we should take particular notice of the fact that this is administered by Ganymede systems. Ganymede is the largest of the 67 known moons of Jupiter, taking its name from the Greek mythical hero Ganymede (why hello, transparent reference to ‘The Myth-Makers’, pull up a chair and put the panda on the TARDIS console). It completes a revolution around its mother planet every seven days and three hours, which CLEARLY REFERS to part three of the seventh story in the canon, ‘Hidden Danger’ – also known as episode three of ‘The Sensorites’- because of the Doctor’s blindness, thus hiding the danger from him, at least in a strictly literal sense.
However, the parallels run deeper. Episode 3 of series 7 is ‘Cold War’, an UNAMBIGUOUS nod both to the Ice Warriors and also ‘The Tenth Planet’, which was set in Antarctica – get it? A war? In a cold place? A COLD WAR? You see what I did there? But what, I hear you ask, perhaps in slightly worried tones while you try and unpick the ropes that are securing you to that office chair, if it isn’t episode 3 of series 7, but episode 7 of series 3?
Well – that turns out to be ’42’. THE THING IN THE VAULT IS MARTHA JONES’ MUM.
Finally, let’s get back to the beginning of the episode – and that first shot of the oxygen display on the suit gauntlet.

What’s going on here? Well, first consider the presence of nine – only NINE bars on the credit meter. This CLEARLY AND DEFINITIVELY refers to the IMMINENT RETURN of Christopher Eccleston. We know this if we examine the letters at the far right: ‘CF’ refers to ‘Christopher – Finish’, while ‘T2’ refers not to Terminator 2: Judgement Day, but rather Trainspotting 2 – a film centring on Mark Renton, as played by Ewan McGregor, WHO CO-STARRED WITH ECCLESTON IN SHALLOW GRAVE. And if you want to know how long this has been building, consider what the Doctor is doing here.

However, what’s most interesting here is ETO-2 at the bottom, and I’ll admit it took me a while to figure this out – and it wasn’t until I realised that the ‘2’ was a massive red herring that I was able to make progress. But a little creative Googling led me to the Express Tax Office in Queensland. Situated in Lake Street (as in ‘Under The Lake’) in the middle of Cairns City, the ETO processes tax returns for couples, students, sole traders and even non-residents, such as those trying to find a way into Australia – to do, say, a Chemical Engineering job.

Oh look. THERE it is.
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