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the two girls' explanation.
     
    Tegan obstinately continued with her account of how the 192 had been snared in a time warp. But the Professor was having none of it.
     
    'Unless we get them away from here, this could turn into dementia praecox.' He spoke with the grave authority of a true expert.
     
    The Doctor said nothing. He needed to keep the old boy's confidence; Professor Hayter could lead them to the TARDIS.
     
    'Professor, there's no time to explain.' Captain Stapley was equally pragmatic. 'I need you to show me where I can find the others. And the Doctor has got to get back his ...' He faltered. Let the Doctor convince the old man about the time warp. 'The Doctor must retrieve his equipment,' he concluded with neat circumlocution.
     
    'If you insist, Captain,' Hayter conceded rather ungraciously. 'The prison centre is somewhere on the other side of that hill.'
     
    The little party moved off down the valley. Their breath misted in the cold air and their footsteps crackled on the frosty earth. They instinctively moved fast to keep warm, though everyone kept a wary eye open for a return of the Plasmatons.
     
     
    As they progressed, Professor Hayter gravitated to the side of Captain Stapely. He felt he could trust the Concorde pilot. He was not so sure about the Doctor, however. The world was full of Doctors with woefully inadequate qualifications; there were several at his own university.
    'What is this equipment of the Doctor's?' he asked suspiciously.
     
    Captain Stapley felt like a schoolboy. He couldn't explain how Golf Alpha Charlie had been used to transport an old police box without making himself sound a complete idiot. 'It's a TARDIS,' he said, with confidence he did not feel.
     
    Professor Hayter signalled them to halt at the end of the valley. On the horizon they saw the great pyramid that Tegan and the Doctor had spotted on their earlier exploration. That was where the TARDIS must have been taken, thought the Doctor. With a bit of luck the Professor could show them the way in without drawing attention to themselves.
     
    'How did that get built in this wilderness?' said Captain Stapley, gazing at the Citadel on the horizon.
     
    'Slave labour I expect,' said Professor Hayter bitterly.
     
    The Captain was just wondering how they would ever convince the Professor they weren't in Russia, when Nyssa cried out: 'Doctor!'
     
    She was rigid with fright and fighting for breath.
     
    'Something's happening ... I can't ...' She could hardly mouth the words.
     
    'No!' she screamed, as if trying to ward off an invisible invader.
     
    ' It's the radiation,' shouted the Professor. 'I said we should keep away from this place.'
     
     
    'Keep still!' The Doctor waved back Stapley and Tegan who had moved to Nyssa's help.
     
    They watched Nyssa carefully. She was suddenly calmer.
     
    'Do not approach the Citadel!' Her voice was deep and resonant and seemed to belong to another person altogether. 'Return to your ship ...
    There is great danger.'
     
    The Doctor studied Nyssa for a few moments in silence, then spoke as if she were a stranger. 'Who are you?' he asked.
     
    'What's happening?' whispered Captain Stapley, overwhelmed by the sudden transformation of Nyssa's personality.
     
    'The intelligence is using Nyssa as a medium,' explained the Doctor.
     
    'Hysteria triggered by ultrasonics,' sneered the Professor contemptuously, dismissing the Doctor's observations with his own diagnosis.
     
    'Be quiet!' The Doctor turned back to Nyssa. 'Who are you?' he repeated. 'What do you want?'
     
    'Krishnan, krishnan ...' Kalid could see everything in the crystal ball. He had silenced the voices in the Plasmaton mass around the Doctor; now he must silence this girl whose mind was attuned to the Great One.
    'Krishnan, krishnan xaraa ...'
     
    Nyssa groaned, feeling pain and despair that were not her own. 'We are
    ... we are ...' She felt another foree that froze the words in her mouth.
    'The control divides
     
     
    us