Doctor Who and the Planet of the Spiders

‘I think you do know, my son,’ said the old man softly.
‘What is it that you most fear?’
The Doctor looked at him despairingly. ‘There is no other
way?’
‘None.’
The Doctor heaved a sigh, seeming to accept some fate that
was inevitable, but far from pleasant. ‘Very well. Give me the
crystal.’
Sarah looked from one to the other in anguish. ‘What is
happening, Doctor? What are you planning to do?’
The Doctor looked at her in surprise. ‘The only thing I can
do. I started all this trouble by taking the crystal. Now I must set
things right by returning it to the cave of the Great One.’
Outside, the little group ceased their concentration. Barnes
spoke but it was the voice of his Spider that came from his lips.
‘Enough. The power is sufficient.’ As they swung round on
Tommy, Cho-Je and Yates came along the corridor. Barnes
shouted ‘Now!’
A tremendous web of energy crackled around the four men.
It flung Tommy, Yates and Cho-Je to one side like thistledown.
Barnes and the others rushed into the Abbot’s room.
Facing them were Sarah, the Doctor, and K’anpo. The
Doctor held the crystal in his hand. K’anpo jumped in front of
the Doctor as if to protect the crystal with his frail body. The
energy web crackled, K’anpo fell – and the Doctor disappeared,
winking out of existence.
The four men froze for a moment. Then Barnes said in his
Spider’s voice, ‘He is in the cellar – come!’
They rushed from the room. Sarah knelt by K’anpo’s body.
He seemed completely lifeless.
Teleported by the force of the old Time Lord’s will, the
Doctor found himself standing beside the TARDIS, crystal in
hand. He produced the TARDIS key, opened the door and