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Peter Capaldi has confirmed that Jenna Coleman will exit her role as Clara in this weekend’s Doctor Who episode.

He will talk about the episode on tomorrow night’s Graham Norton Show, when he appears on the couch with Tom Hanks and David Walliams.

Asked about the next episode of Doctor Who (November 21) Capaldi said: “It’s a sad one, gripping and very strange. And it’s the end of the line for Clara Oswald played by Jenna Coleman who’s been my companion for the last two years. It’s the end of her story. I don’t want to go into the details of it, but it’s sad.”

Asked if she might come back, the actor mysteriously said: “Sometimes people can’t come back. Sometimes things happen that they can’t come back from.”

Talking more about Coleman, who is set to star in a brand new ITV drama about Queen Victoria, he added: “She was there at the beginning and showed me around the Tardis and showed me the ropes. Doctor Who is a wonderful show but it is a big juggernaut and it’s nice to have someone who has already been there for a few years to compare notes with when things get a bit rough.”

And on the subject of his new assistant, Capaldi quickly diverted the conversation to the acting skills of Game of Thrones’ Maisie Williams, who has guest starred in this series.

“Maisie is fantastic, she’s been in Game of Thrones since she was 12 and is very assured. I was doing a shot with her and when they called ‘action’ she slightly pulled me back. When I asked her what she was doing she said, ‘You were in my light.’ But she is lovely.

“She is 18 and speaks a whole different language and she’s taught me a lot of new cool things to say like ‘Ape’ which means ‘great,’ so it’s the new ‘sick,’ which has taken over from ‘wicked.’ Jenna recently said that Maisie made her feel old and I said, ‘Welcome to my world.’”

The Graham Norton Show is on BBC1 on Fridays at 10.40pm