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Kris Marshall was a long-running favourite to be the 13th Doctor.

The My Family star was hotly-tipped to take over from Peter Capaldi on the BBC show, with his own departure from Death In Paradise only fuelling rumours.

But after Jodie Whittaker was announced as Doctor Who 's first ever leading lady, it's now thought that the star will appear on the hit sci-fi show as her right-hand man.

As Peter Capaldi leaves the show, alongside executive producer Steven Moffat, Pearl Mackie is also stepping down from her role as assistant Bill Potts after just one series.

(Image: BBC)

And bosses of the show are still hoping to get Kris involved in some way, according to reports.

A source told The Sun : "Kris is a big fan of the show and the BBC are a big fan of his."

He could join Matt Lucas' character Nardole to travel all of time and space with the Doctor.

However, the BBC said no decisions have yet been made on the casting of a companion.

Jodie was announced as the 13th Doctor on Sunday, and will take over the iconic role from Peter in the Christmas special.

(Image: PA)

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She's the first ever female to take on the role, and her casting has divided fans.

While some applaud the choice, others feel that the Doctor is, and always should be, a man.

But among those to praise Jodie's casting are a number of former Doctors.

12th Doctor Peter said: "Anyone who has seen Jodie Whittaker ’s work will know that she is a wonderful actress of great individuality and charm. She has above all the huge heart to play this most special part. She’s going to be a fantastic Doctor."

(Image: BBC) (Image: BBC / Doctor Who)

And Sixth Doctor Colin Baker added: "Well I never, the BBC really did do the right thing and let the Doctor be in touch with her feminine side.

"As a father of daughters – result! Change, my dears, and not a moment too soon – she IS the Doctor whether you like it or not."

And when the backlash came, he added: "Cannot deny that I am amazed by the 'never watch it again' reaction by some viewers. I ­hesitate to call them 'fans'. Very sad.

"To those making 'parking the Tardis' jokes – name me one male Doctor that was unfailingly good at that!"