'Sherlock' writer joins 'Doctor Who'

Doctor Who showrunner Steven Moffat has confirmed that Steve Thompson will write an episode for the show's next run.

He told Doctor Who Magazine that Thompson's script will air third in the series, with Neil Gaiman's contribution moving to fourth place.

An episode written by Mark Gatiss will also move to the second half of the series.

Thompson previously wrote the second episode of Sherlock and has also worked on Doctors and The Whistleblowers.

Moffat explained to the magazine that the changes were made to balance the look of the series, following concerns that there was "not enough outside" in the first half of the run.

The sixth series of Doctor Who is expected to launch on BBC One later this year.