Arc of Infinity
When the Doctor returns to Gallifrey, he learns that his bio data extract has been stolen from the Time Lords' master computer known as the Matrix.
The bio data extract is a detailed description of the Doctor's molecular structure — and this information, in the wrong hands, could be exploited with disastrous effect.
The Gallifreyan High Council believe that anti-matter will be infiltrated into the universe as a result of the theft. In order to render the information useless, they decide the Doctor must die...
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Terrance Dicks
Terrance William Dicks was an English author and television screenwriter, script editor and producer. In television, he had a long association with the BBC science-fiction series Doctor Who, working as a writer and also serving as the programme's script editor from 1968 to 1974