The long-running science fiction show Doctor Who has almost reached 50 years. On the 23rd November it will be the 50th anniversary of the first time William Hartnell came onto TV screens as the alien time-traveller. Since then there have been 12 actors to play the doctor (including John Hurt but not non-canon actors from specials e.g. Rowan Atkinson) and a 13 actor will be Peter Capaldi who gets introduced on Christmas.
(If you are not familiar with Doctor Who and are wondering how they spin 13 actors in the story the doctor is a time lord and can regenerate when close to death, so then he looks different)
To celebrate the 50th anniversairy there will be a world-wide (ish) special airing called the day of the Doctor
It is set to air simultaneously around the globe on 23rd November 7.50pm UK time (gmt)