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

The Doctor sends Shapp and Merak back to Atrios to try and halt the Marshal's attack, while he and Romana attempt to disable Mentalis.



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Episode complete credited cast:
Davyd Harries ...
K9 (voice)


The Shadow, with time on his side, waits for circumstances to force the Doctor into opening his TARDIS, helped along by fitting a mind control device on Princess Astra to turn her against her allies. Meanwhile, Mentalis, the war computer, means to have its final say in dealing with Atrios. Written by statmanjeff

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Release Date:

10 February 1979 (UK)  »

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Aspect Ratio:

1.33 : 1
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This episode was watched by 8.6 million viewers on its original transmission. See more »


Romana: So if the Marshall attacks...
Shapp: Which he will.
Doctor Who: There'll be a rather large bang, big enough to blow up Zeos, take Astrios with it, and make certain the whole thing ends in a sort of draw. That's the way these military minds work: the Armageddon Factor.
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User Reviews

65% running around corridors and into transmats.......
21 August 2015 | by (Swansea, United Kingdom) – See all my reviews

Mentalis is programmed to believe that the war is over, the Marshall is en route to attack, so Mentalis will self destruct, and destroy Zeos and Atrios up, 'The Armageddon factor.' Astra is mesmerised by the Shadow, and taunts Merak. The Marshall fast approaches in order to destroy, and Mentalis goes enters self destruct mode. The Doctor rigs an ingenious mock up sixth segment and attaches it to the remaining 5 pieces, and uses the key to stop time, and halt the Marshall's attack. Astra is sent to trick the Doctor, she tries gaining access to the TARDIS and succeeds. The Shadow sits with the now mesmerised K-9.

Shapp's shooting is like nothing I have ever seen before on Dr Who, it's like a Spike Milligan sketch. Merak is clearly none to bright either, chasing after Astra's shadow. This week it's K-9's turn for the idiot inducing pills, he's tricked a few times, this time with a beeping box.

It's pretty good, but descends into farce on occasion. It's possible a four part story would have been better? Part 4 has featured lots of running about, and lots of jumping into teleports.


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