Sergeant Benton made an instinctive move to dash out of the TARDIS.  But the new Doctor, or as far as Benton was concerned, the old Doctor, Jo's Doctor Two, laid a restraining hand on his arm.

'Steady on, Sergeant, they're out of our reach now.  He knew what he was doing - at least, I hope he did.'

'Will they be all right, Doctor?'

The little man reached up and patted Benton reassuringly on the shoulder.  'As far as I can tell, that stuff out there has gone to a great deal of trouble to get me - or rather, him -, and I doubt if whoever or whatever sent it simply wanted us dead.  No, they've both been transported somewhere.'

'I saw that - the question is, where?'

Doctor Two shrugged.  'Where indeed?'  Suddenly he darted over to the scanner and peered at it.  'Do you know, I think our blobby friend out there has just gone off the boil.'

Benton looked over his shoulder.  The blob of jelly, now shrunken and still, lay quietly in one corner of the laboratory, showing no sign of its former ferocity.  'Right,  let's get some explosives and blow it to smithereens,' said Benton eagerly.

'I think we can be a bit more subtle than that, Sergeant.  We must study it.  It may still have a great deal to tell us.'  He opened the door of the TARDIS, and they both came slowly out into the laboratory.  Cautiously they approached the jelly-blob.  It stirred and crackled, but only very faintly.

The door opened and the Brigadier, revolver in hand, peered cautiously round it.  At the sight of two figures bending over to look at the blob he snapped, 'For Heaven's sake be careful of that stuff.'

At the sound of his voice, Sergeant Benton straightened up and turned round.  So did the second Doctor.

When he saw him the Brigadier opened his mouth like a stranded fish, spluttering to get the words out.  'Oh no!' he gasped finally.

Doctor Two beamed at him.  'Oh yes, Brigadier.  How are you, my dear fellow?'

'Pretty well, thanks,' said the Brigadier, returning the handshake automatically.  Then realising that he was greeting a man who too all intents and purposes no longer existed, he spluttered, 'What the blazes is going on here?'

'It's him, sir,' explained Benton rather obviously.  'The one we met first of all.'

'I can see that.  Why has he changed back again?'

'He hasn't, sir, not exactly.  This one just sort of Popped up.  There are two of them now!.  There was even a third - but he was only on the scanner screen.'

'Heaven preserve us!' said the Brigadier faintly.  He looked for a stool to sit on, but by now they had all disappeared.  He leaned against the wall and spoke in a voice of unnatural calm, 'Sergeant Benton!  Will you please tell me exactly what's been going on?'