The Seeds of Death
It is the 21st Century and Earth is totally dependent on T-Mat, a revolutionary form of instant travel. When the system breaks down the Doctor and friends make a hazardous journey to the relay station on the moon only to find that it has fallen into the hands of the Ice Warriors who plan to invade Earth.
Using T-Mat, the Ice Warriors transport seed pods to Earth which burst, disgorging a deadly Martian fungus. This spreads rapidly, extracting vital oxygen from the atmosphere. Can the Doctor outwit the evil Ice Warriors and destroy the fungus in time to save a dying world?
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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