Cult
Rex Features
A competition will be run for one viewer to take part in a specially-written scene which is to be shot on the set of the Tardis.
Speaking about the competition, Tonight's The Night star John Barrowman said: "This is a fantastic opportunity and I can't wait to see the winner experience performing on the set of Doctor Who."
Viewers over 18 are invited to submit an application featuring a photograph of them in their home-made alien costume, along with information about their alien, such as where it is from and its characteristics.
A group of 50 applicants will then be selected to meet a panel including John Barrowman and Doctor Who casting director Andy Pyror.
The scene will be broadcast in the final episode of Tonight's The Night later this spring.
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