The Deadly Assassin is the third serial of the 14th season of the British science fiction television programme Doctor Who, which was first broadcast in four weekly parts on BBC1 from 30 October to 20 November 1976. It is the first serial in which the Doctor is featured without a companion, and the only such story for the classic era. In the serial, the renegade alien Time Lord the Master (Peter Pratt) seeks to restore his life force by disrupting a power source that would destroy the planet Gallifrey along with his archenemy the Fourth Doctor (Tom Baker). Plot The Fourth Doctor has a precognitive vision about the President of the Time Lords being assassinated. The Doctor goes to Gallifrey to stop the assassination. At the Panopticon, a Gallifreyan ceremonial chamber, he notes a camera stationed on an unguarded catwalk. He also spots a sniper rifle next to the camera. The Doctor fights his way to the catwalk, warning that the President is about to be killed. Unbeknownst to the Doctor, the assassin is among the delegates and shoots the President dead. However, the crowd sees the Doctor on the catwalk with the rifle and assumes he is the killer. Under interrogation, the Doctor maintains that he has been framed. Eventually, Castellan Spandrell starts to believe him and orders Engin to assist him in an independent investigation. To delay his possible execution, the Doctor invokes Article 17 and announces that he will run for President, which guarantees liberty for those running for office during the course of an election. The Doctor realises that it was the Master who had sent him the premonition of the assassination through the Matrix, a vast electronic neural network which can turn thought patterns into virtual reality. He decides to enter the Matrix to track the Master. In the Matrix, the Doctor confronts an assassin who eventually reveals himself as Chancellor Goth. The Master, realising that Goth has been effectively defeated, tries to trap the Doctor in the Matrix by overloading the neuron fields. Engin gets the Doctor out of the Matrix, but Goth is fatally burnt. The Doctor and Spandrell, accompanied by soldiers, make their way to the chamber where the Master and Goth were accessing the Matrix. They find the Master without a pulse and Goth dying. Goth reveals that he found the Master, near death, on Tersurus. The Master was nearing the