Journey's End - To be watched by 10 million!

The BBC expects viewing figures for the fourth series, starring David Tennant and Billie Piper, to peak for the 13th and final episode on Saturday, eclipsing the 9.1 million who watched episode one.

The broadcaster has even banned the production of preview tapes of the final instalment, called Journey's End, to makes sure its plot is not prematurely revealed.

The 12th episode in the series - called The Stolen Earth and watched by 7.4 million people on Saturday - was a cliffhanger  

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