[Looking at a device in the Ioniser control room] Yes. This is an automatic chemical dispenser, is it not?
Yes.
How does it work?
Well, you choose the category of the article that you want by indicating it on one of these little chaps here. [Indicates several small buttons] Jolly good. And now you dial the precise chemical formula that you want there.
May I? There's something I need rather desperately. [Dials in a short formula]
[The machine dispenses a sealed plastic cup. The Doctor removes the seal]
What's that?
Water. [Drinks it]
Indeed.
Ah, that's better. Now then, let's see. Jamie has vanished, [Does more dialing] Victoria's on her way back to the base, and neither of them can help us with our main problem.
[The dispenser produces a phial which the Doctor takes]
An exact description of the spacecraft's propulsion unit.
That will?
I will.
With the help of Ammonium Sulphide?
We know these creatures come from Mars, don't we? What do we know about their planet's atmospheric conditions?
Chiefly nitrogen, with virtually no oxygen or hydrogen.
Then they're not going to enjoy this little concoction much, are they?
What? You mean you intend to use it as a kind of toxic gas?
Well, if I'm going to an alien spaceship, it may come in handy.
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