Doctor Who (1963–1989)
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The Armageddon Factor: Part Six 

The Doctor, having met another Time Lord named Drax in the caves, teams up with him to try and defeat the Shadow, but Drax shrinks him instead of his Mute captor then turns the shrinking ... See full summary »



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Episode complete credited cast:
Davyd Harries ...
Ian Saynor ...
Valentine Dyall ...
John Leeson ...
K9 (voice)


The Doctor, having met another Time Lord named Drax in the caves, teams up with him to try and defeat the Shadow, but Drax shrinks him instead of his Mute captor then turns the shrinking ray on himself, allowing the Shadow to claim the Key to Time. Meanwhile, everyone finds out that Princess Astra, herself, is the sixth and final segment of the Key to Time. And once it is assembled, nothing stands between the Shadow and absolute power of the Universe...except the Doctor! Written by Moviedude1

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Not Rated | See all certifications »




Release Date:

24 February 1979 (UK)  »

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Technical Specs


| (DVD)

Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


Graham Williams and Douglas Adams rewrote The Doctor's confrontation with The Black Guardian. In the original script, the Doctor simply decided that he did not trust the White Guardian with the Key, and consequently scattered the six segments again to prevent anyone from controlling it. See more »


When Drax is sitting next to K9 inside the TARDIS, the shadow of a boom microphone can be seen on the wall above his head. See more »


Doctor Who: We have the power to do anything we like, absolute power over every particle in the universe, everything that has ever existed or ever will exist as from this moment. Are you listening to me, Romana?
Romana: Yes, of course, I'm listening.
Doctor Who: 'Cause if you're not listening I can make you listen, because I can do anything. As from this moment there's no such thing as free will in the entire universe. There's only my will because I possess the Key to Time.
See more »


Featured in Great TV Mistakes (2010) See more »

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User Reviews

Would have been excellent without the Shadow, and maybe a scene from the white guardian
21 August 2015 | by (Swansea, United Kingdom) – See all my reviews

And here it is the big one, conclusion to the story and the key to time arc serial.

Drax has shrunk the Doctor and himself, and the Doctor's makeshift 6th segment is breaking down, the Marshall and total destruction are edging ever closer. The Shadow has gotten his hands on the key to time, but the Doctor outsmarts him, halts the Marshall's attack, but then has the Black Guardian to deal with.

Sadly the Marshall has been stuck in the same scene for 3 episodes, a shame because he started so well.

The Shadow is useless, what a nincompoop he is, a stereotypical clichéd bad guy, The Black Guardian must have been short of employees. This serial would have been way better had the Shadow been well realised.

I've moaned about the humour several times, but in this episode it works very well, the funny is balanced with terror, it works! The Doctor's scene about having absolute power is fantastic, and brings a true unease.

The Black Guardian is particularly good, a true evil being and a good foe for the Doctor. But why was there no final scene from the white guardian, i've never understood that.

So the point of the last few weeks was.........

Maybe time now for a new take on the Key to time???


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