The Doctor clapped her on the shoulder. 'You got back here just in time.'

He pulled her closer, masking their conversation from the others. 'K9 filled me in on the way back.' He frowned at her. 'This is one occasion when rushing in and interfering probably wasn't the best course of action, was it?

Especially given the historical implications. History hangs in the balance out here, remember.'

'The simulation was very convincing,' retorted Romana. 'It even fooled the Chelonians up here, and they must be the most suspicious race in the universe. You wouldn't have seen through it. And besides, it wasn't me who destroyed the Femdroids.'

He held up a hand. 'Never mind that. We've got to think of a way to undo the damage and save these people.'

Romana lowered her voice even further. 'There's not enough food left to nourish the Hive, surely? It'll dissipate.'

'Not until we've been gobbled up,' said the Doctor. 'And besides, it's got designs on the TARDIS.' He became aware that somebody was standing at his shoulder, very irritatingly. 'Yes, what do you want?' he snapped.

Harmock, Fritchoff and Jafrid stood in a rough circle behind him. 'We've put our heads together and had a thought,' said Harmock.

'Based on our understanding of the Femdroids' devious plan,' said Jafrid.

Fritchoff came forward. 'The zodium bomb,' he said. 'If the Hive is still coming here, the plan can still be put into operation. We'll blow the Hive to pieces.'

'And yourselves,' said the Doctor.

'But at least Metralubit will be safe,' said Harmock. 'The few citizens left there can emerge from the dome and reclaim our world. Who knows, after a few years they might even find a way to fiddle that transmat thing and get our people back from Regus V.'

'It will be an honourable way to die,' said Jafrid. 'I shall detonate the zodium bomb.'

Harmock coughed. 'I am the Premier of Metralubit. The task should fall to me.'

Fritchoff snorted. 'Excuse me, but as a rebel militant committed to the establishment of a new, functional democracy, it should surely be me that releases the firing mechanism.'

'Gentlemen, gentlemen,' said the Doctor. 'No martyrdoms will be necessary, I a.s.sure you.' He tapped Harmock on the shoulder. 'You've just said something very important, you know.'

He smiled. 'Have I? It would be nice to feel useful again.'

'Don't get too carried away - I probably would have thought of it anyway,'

said the Doctor.

'I think he means the transmat,' said Romana. 'If we can lure the Hive into its field and alter its directional setting we could expel it into deep s.p.a.ce.'

'Or even better,' said the Doctor, determined not to let her steal all his thunder, 'flip it into a interst.i.tial state. Neither here nor there. Keep it out of everybody's way. It's a splendid idea.'

K9 came forward. 'Objection, Master.'

'What's that?'

'The transmat and its control mechanisms are on Metralubit.'

'Yes, well,' said the Doctor, as patiently as he could. 'There's nothing to stop us popping down there, is there?'

K9 raised his head. 'The Hive is descending, Master.'

Romana was puzzled. 'How can you tell without your sensors?'

The question was answered for her by Fritchoff, who grabbed her arm and pointed upwards incredulously.

Above them, coming into view between the clouds, was the Hive. It was black, shaped like an inverted isosceles triangle, and was the size of an asteroid.

Stokes heard the Hive before he saw it. A vicious, continuous drone. And when he looked up and saw it he started to cry.

Immediately he started to run even faster towards the small blue shape picked out on the horizon. His legs racked by muscular pain, his lungs dry and fit to burst, he hauled himself on.

The Hive's enormous shadow brought an air of panic over the small band of survivors gathered in the valley. Harmock did his best to rea.s.sure the humans as the darkness grew and the drone grew louder, while Jafrid attended to his troopers.

The Doctor and Romana were hunched over K9. 'Now, there's a microphone on you somewhere, isn't there?' the Doctor asked him.

The eyestalk extended. 'Please speak into this aperture, Master.'

'Excellent.' The Doctor coughed and rearranged his scarf 'I'd better phrase this just right, hadn't I?'

'Phrase what?' asked Romana. She didn't want to admit that she hadn't a clue what lay behind this latest burst of activity.

'You'll see,' he said, with a toothy grin. 'Now, K9, I want you to transmit the following message up to the Hive. We know they love to listen in on radio waves, so let's give them something to chew on.' He looked up at Romana and his mood turned sombre. 'After all, the continued existence of billions of lives are hanging by a thread.' He stared into the middle distance, his large eyes opened to their full wideness.

Romana nudged him. 'Hadn't you better send your message, then?'

He turned to face her and said quietly, 'Romana, do you ever get the feeling that you've been manipulated?'

'Only when I'm with you.' She pointed to the microphone. 'Send the message, Doctor.'

He nodded and cleared his throat again. 'Ready, K9?'

'Affirmative. Channel is clear.'

The Doctor a.s.sumed his most commanding tones. 'h.e.l.lo. This is the Doctor calling the citizens of Metralubit. I'm afraid I have to leave you. In fact, by the time you get this I'll be well away. I would have tried to save you but there was just no time, and I'm afraid you will shortly be at the mercy of the invading Hive. One more thing, and this is very important. You must destroy the transmat system in the dome immediately. It is imperative the invaders do not reach the transmat system. They could wreak terrible havoc with such technology at their disposal.' He signalled to K9 to break the link.

'Message transmitted, Master,' said K9.

The Doctor raised his crossed fingers to Romana. 'Let's hope it works. I don't want a band of teleporting marauding insects on my conscience.'

Romana shook her head at the Doctor's inventiveness. 'Very clever. You lure the Hive to Metralubit.'

'That's right.'

'And then what do you do? What will stop them using the transmat? It's a non-terminal system - they could leapfrog their way into populated galaxies in a hundred years or so.'

The Doctor pointed up. The Hive was already shifting slightly, its underside crackling and throbbing where it nudged the heavy clouds. 'There it goes.'

Romana sighed. 'Do you answer the question: or do I employ physical violence?'

'Oh, I'll answer it in a moment,' he said casually. 'If I can think of an answer.'

... have to leave you. In fact, by the time you get this I'll be well away...

The words sliced through the fetid air of the main chamber, killing any hope the Darkness had left.

Without the TARDIS we are doomed, cried the Onemind, filled with vengeful thoughts. cried the Onemind, filled with vengeful thoughts.

But listen, cautioned the Onememory. He has said, 'You must destroy the He has said, 'You must destroy the transmat system in the dome immediately. It is imperative the invaders do transmat system in the dome immediately. It is imperative the invaders do not reach the transmat system.' not reach the transmat system.'

What is transmat? cried the unfed millions. cried the unfed millions. We need food! We need food!

The transmat will bring food, said the Onememory. It linked itself to the Glute-screen with the power left to it and brought forth sticky images of creatures vanishing and reappearing across vast distances of s.p.a.ce. said the Onememory. It linked itself to the Glute-screen with the power left to it and brought forth sticky images of creatures vanishing and reappearing across vast distances of s.p.a.ce. This This can be ours. It is at our mercy. We can simply take it. can be ours. It is at our mercy. We can simply take it.

The Onemind pondered a few moments. The Hive had made it a policy to avoid sophisticated societies, fearing detection and retaliation to its advances. That was why it had engineered feeding colonies such as the one on Metralubit. But now the gate was open to such a device, with fewer than three hundred beasts to defend it against their full might...

We must hurry there, it said. it said.

Hurry, hurry, chanted the dissociated hordes. chanted the dissociated hordes.

The Doctor sat on a rock, staring into nothingness. 'I keep waiting for inspiration to strike,' he said. 'But nothing's coming through. This must be how it feels to be a poet.'

'I shouldn't think many poets have had to cope with an army of flesh-eating bugs,' said Romana, who was also sitting on a rock and staring into nothingness.

'Urgency is a relative concept,' said the Doctor. He turned to her excitedly.

'Wait a moment. What did you just say?'

'I said I shouldn't think many poets have had to cope with an army of flesh-eating bugs,' she said, scanning his face for what had caused such an extreme reaction to her words.

'I thought so,' he said sinking back on the rock.

'Thought what?'

'Thought that if I leapt up and cried "What did you just say?" it might make you feel better about this situation for a few seconds, in the belief that I was formulating a plan based on some casual remark that you'd made, and that it might inspire you to think of something on your own.'

'But it hasn't,' said Romana.

'No. Sorry.' He pa.s.sed her a crumpled string bag. 'Have one of these. Let's work out our advantages and disadvantages.'

Romana munched on a chocolate coin. 'We can't reach the TARDIS in time to reach Metralubit and set the transmat. There's n.o.body there we can contact who can operate the machine, and even if there was the Hive would pick up our message and find out our plan. Our only allies -' she pointed to the a.s.sorted company of humans and Chelonians huddled in the valley '- are equally bereft of means or inspiration.'

'Right, now the advantages,' said the Doctor.

There was a long silence. The wind blew by.

And then K9 spoke. 'Master, Mistress.'

The Doctor leapt off his rock and crawled over on all fours opposite K9. 'I don't want to hear this unless it's some miraculous solution that we've overlooked.'

K9 clicked and beeped. 'This may be the case. The answer lies in my construction.'

'It does?'

'The Femdroids were created in my image,' said K9. 'Their internal mechanisms are roughly a.n.a.logous to my own. And one of my capabilities is to respond to high-frequency coded commands.'

'Of course!' said Romana. 'The whistle.'

'What's that got to do with anything?' said the Doctor. 'These Femdroid things have had their power linkage and command circuitry blown up. A whistle won't bring them back to life.'