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Doctor Who stars Bradley Walsh and Tosin Cole have quit the BBC sci-fi show.

The pair have played The Time Lord’s companions for the past two series.

Fans will see retired bus driver Graham O’Brien (Bradley) and step grandson Ryan Sinclair (Tosin) in the festive special with the Daleks.

But they won’t be in the next series due to air in 2021 and will be seen as a major blow to the show.

(Image: BBC / Ben Blackall)

The pair’s departure leaves The Doctor (Jodie Whittaker) with just one companion Yasmin Khan (Mandip Gill).

BBC chiefs are staying tight lipped about whether Graham or Ryan perish when they face The Daleks later this year.

It is understood the stars’ work schedules led to their decision to leave.

Bradley has often joked how he “wished he had a Tardis” to juggle all his commitments as he also fronts ITV’s daytime quiz The Chase, has an ITV series with his son called Breaking Dad and has just landed a BBC game show with Holly Willoughby called Take Off.

(Image: BBC / BBC Studios)

Tosin has recently landed a major role in a new American drama called 61st Street where he will play a promising high-school athlete with a bright future who’s accused of murdering a police officer during a drug bust gone wrong.

Series 13 is believed to be filmed in autumn and will be released in 2021.

Speaking about the grand finale, Mandip Gill said: "Again it's a two-parter which is new for us for this series.

"It's so exciting! I know we say it all the time but it is – even though we filmed it a long time ago."