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The Master arrives in 21st Century — as Mister Saxon, Prime Minister — and the UK enters a period of terror when contact with an alien race known as the Toclafane is announced.
Elize Du Toit returns in this episode, as the "Sinister Woman", the same role she played in "42".
In "Utopia", Professor Yana refers to a "sound of drums" which only he can hear, a result of the Master's persona buried within him.
Production and publicity
This (with "Utopia" and "Last of the Time Lords") is the first three-part story in the revived series of Doctor Who.
The episode was advertised on BBC television with a spoof party political broadcast, featuring celebrities Sharon Osbourne, McFly and Ann Widdecombe showing their support for Mr Saxon. During the broadcast, drums can be heard, a probable reference to the episode. There is also a different trailer which shows still shots of the Doctor, Martha Jones and Captain Jack over the top of which Mr Saxon's speech, in which he says "... what this country really needs, right now, is a doctor", can be heard and at the end there is a small clip of him showing his trademark smile.
The episode was advertised on BBC radio with a trailer containing the noise of the TARDIS and Mr Saxon saying "This country has been ill, this country needs healing. In fact I'd go as far as to say, what this country really needs, right now, is a doctor". This is the first time that the beginning of this phrase has been heard.