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The plot concerns the Doctor being accused of assassinating the Time Lord president, his subsequent investigation of a plot and its cover up, and his battles against his adversary, The Master, who was trying to gain control of the presidency. The Master was a withered shell having used up all twelve regenerations a Time Lord has and was seeking a way to use the president's powers to regenerate once more.
Part of this battle occurs in The Matrix, a virtual reality environment the Doctor accesses by linking his mind to the Amplified Panatropic Computer Net. This net contains all the Time Lords' wisdom.
The story was written by Robert Holmes and directed by David Maloney. The cast also includes Helen Batch , Michael Bilton , Erik Chitty , John Dawson, Bernard Horsfall , Angus Mackay as Cardinal BorusaBorusa is a fictional character in the British science fiction television series Doctor Who''. He is a Time Lord, and a former teacher of the Doctor. Borusa appeared in four serials: The Deadly Assassin The Invasion of Time Arc of Infinity and The Five Do, Peter Mayock , Peter Pratt , George Pravda , Maurice Quick , Llewellyn Rees , Derek Seaton , and Hugh Walters .
| Preceded by: The Hand of Fear | List of Doctor Who serialsThis is a list of Doctor Who television serials. Each serial was a multi-episode storyline; numbers in brackets after the serial titles indicate the number of episodes in the serial. Unless otherwise noted, episodes were 25 minutes long. William Hartnell | Followed by: The Face of Evil |