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The big day is finally here for Doctor Who fans, with the 50th anniversary episode The Day Of The Doctor set to air on Saturday night.

The long-awaited feature length instalment – which stars Matt Smith, his Doctor Who predecessor David Tennant and John Hurt – will kick off at 7.50pm on BBC One, as well as being simulcast in 93 countries around the world.

The episode will also be shown at the same time in 3D screenings in selected UK cinemas, as well as in theatres worldwide.

Vue Cinemas have announced that the episode is set to break the record for the biggest-ever one off event to be screened in cinemas – beating the likes of the Rolling Stones’ film Shine A Light and the 25th anniversary celebrations of Les Miserables.

A number of shows and events have been taking place in the days leading up to the episode, to mark the 50th anniversary of the iconic show.

These have included the BBC Two drama An Adventure In Space And Time, which focused on the making of Doctor Who‘s first ever series, starring David Bradley as William Hartnell.

Meanwhile around 20,000 fans have flocked to a three day celebration to mark the occasion, which is being held at the ExCeL Centre in London.

The show, which was originally intended as an educational family programme to bridge the gap between football on TV and the evening schedule, was first broadcast on November 23 1963.

It is now, according to the Guinness Book Of World Records, the most successful science-fiction series in the world, with a global audience of over 80 million.

The Day Of The Doctor will also mark Matt Smith’s penultimate appearance as the Doctor before he bows out at Christmas to be replaced by Peter Capaldi.