Doctor Who's composer Murray Gold has described the upcoming 50th anniversary special as "controversial".

Gold hinted to Den of Geek that a twist in the "movie-length" November episode could divide fans.

"There's a thing they've done in it, which might be controversial," he said. "It's interesting though."

Gold added that he will be sad to see the "brilliant" Matt Smith leave Doctor Who, following the actor's announcement that he will depart the BBC sci-fi drama at Christmas.

"Matt has a very interesting internal energy, which he allows to show," he said. "He's a child, he's an old man - everybody knows this. People have had since 2010 to notice this about him. He's really so good."

Doctor Who's 50th special - penned by showrunner Steven Moffat - will air on Saturday, November 23 on BBC One.

> Steven Moffat on new Doctor Who: A big range of people could play it

Watch Matt Smith, Jenna Coleman and Steven Moffat talk Doctor Who with Digital Spy below:

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