Doctor Who's Tennant to be an Extra

Doctor Who star David Tennant has landed a part in Ricky Gervais' hit comedy Extras.

David, who has proved a big hit with viewers as the Time Lord, will join a huge cast of stars for the 80-minute Christmas special, according to reports.

TV bosses are keeping quiet about David's appearance in the final episode of the award-winning comedy - but insiders have hinted that it will be linked to his role as The Doctor.

One said: "David's a huge fan of the show and extremely popular, so we've signed him up. He'll be in good company as we're lining up some other great names."

It's thought that celebrity chef Gordon Ramsay, actor Clive Owen, TV host Vernon Kay and veteran dancer Lionel Blair will also appear.

Meanwhile, Ricky has recorded an hilarious promo video for Extras - which sees him try and pitch the idea for the series to the Dragons' Den millionaires.

In the spoof promo, Rocky tries to convince the entrepreneurs to give him cash but fails miserably.

It will be screened as part of Ricky's stand-up tour.