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:
Princess Astra
The Shadow
Davyd Harries ...
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?


This was the last appearance of Mary Tamm as Romana. 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: Well if I knew where I was going, there'd be a chance the Black Guardian would, too - hm? - hence, this new device.
Romana: What is it?
Doctor Who: Ah, well, it's called a randomizer, and it's fitted to the guidance systems and operates under a very complex scientific principle called pot luck. Now, no one knows where we're going, not even the Black Guardian.
See more »


Featured in Great TV Mistakes (2010) See more »

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User Reviews

The Kitchen Sink Episode!
24 June 2016 | by See all my reviews

The Key to Time series was a mixed bag, some great ones like The Ribos Operation and some rubbish ones like The Power of Kroll, and The Armageddon Factor falls right in the middle being a story full of merits and faults that level out perfectly.

This six-part finale revolves around the planet Atrios which is at war with it's twin planet Zeos, but when the Doctor and Romana arrive on Zeos they find that it is deserted and a servant of the Black Guardian, known as the Shadow is manipulating the war to get the sixth piece of the Key to Time.

This story has a brilliantly interesting concept that really keeps you going through the dullness of episodes 3-6. This is a shame because episodes 1-2 have a strong plot with some great characters and some nice arcs, but then it turns into the kitchen sink story.

The Armageddon Factor has a narrative like a 2p machine, repeatedly adding more and more concepts trying to get something worthy out of it, but while some nice small elements emerge from the chaotic mix of plot threads, nothing substantial leaves a lasting impression.

The acting is usually very strong, especially by John Woodvine as the Marshall, and Ian Saynor as Merak, by it's Davyd Harries who gives the best performance in my opinion. He's clearly having fun and constantly finds ways to ramp up the performance to something that is truly funny and entertaining to watch, especially in episodes 3 & 4.

Lalla Ward gives a good performance as the damsel in distress Princess Astra, despite not really doing a lot, and Baker and Tamm give some of the strongest performances this season. I also like Barry Jackson as Drax who shows up for the final two episodes.

This is a story with an ridiculous amount of padding. Some examples of this are the time- loop introduced in episode 4, and the shrink ray from episode 5 which just serve to extend the story by a few more episodes.

The Armageddon Factor has it's merits, but also it's faults, and while it's not quite the finale to the season we wanted, it's entertaining enough to be worthwhile.

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