Editing Shada (Doctor Who) (section)

==Synopsis==
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The [[Fourth Doctor]] answers a distress signal from Professor Chronotis, a [[Time Lord]] posing as a professor at St Cedd's College, Cambridge who lent a [[Gallifrey]]an tome to his student Chris Parsons. The Doctor retrieves the book while Chronotis dies after his mind is extracted by the sphere of a mad scientist named Skagra, living long enough to warn [[Romana (Doctor Who)|Romana]], [[K9 (Doctor Who)|K9]], and Parsons of them and Shada. The Doctor locates Skagra's cloaked spacecraft, only for his companions to be captured while Skagra has his sphere extract the Doctor's mind to decode the book before taking Romana in the TARDIS to his carrier ship and Krarg creations. But the Doctor survives his ordeal with his mind intact and has the ship's computer release Chris and K9 and take them to a space station Skagra previously occupied. The group finds Skagra's discarded colleagues and learn he is after a Time Lord named Salyavin.

Back on Earth, Clare Keightley accidentally revives Chronotis whose chambers are revealed as a [[TARDIS]], the Professor explaining the book is a key to the prison planet Shada where Salyavin is held. Chronotis and Clare repair the TARDIS to reach Skagra's carrier, saving the Doctor and Chris after Skagra decodes the book and reveals his intent to absorb Salyavin's mind and use its [[telepathy]] to unite all life into a single Universal Mind.

The group reaches Shada as Skagra releases the prisoners, and Chronotis is revealed as Salyavin with Skagra extracting his mind and turning the prisoners and Chris into his thralls. Reminded that the Universal Mind contains a copy of his brain, the Doctor builds a telepathy helmet to wrest control from Skagra while the Krarg are destroyed. Skagra ends up a prisoner in his own ship while the Doctor returns the restored prisoners to Shada and parts ways with Chronotis, musing over Chronotis' exploits being exaggerated while expecting a similar treatment within two centuries.