Sarah Lancashire To Guest Star in Doctor Who

From The SUN: Sarah Lancashire, 43, kicks off the fourth series this spring playing mysterious villainess Miss Foster — armed with her own sonic screwdriver. The actress, formerly airhead barmaid Raquel Watts in Coronation Street, revealed she loved filming the hour-long show.
She said: “I’m absolutely thrilled to be in Doctor Who. It’s a brilliant episode.”
BBC insider added: “This series is going to be the best yet. Sarah’s a cracking actress.”
The series will see comic Catherine Tate, 39, back as the Doctor’s dopey sidekick Donna Noble.
It opens with the pair tackling aliens in London.
They will also travel through time for an encounter with murder mystery writer Agatha Christie and take a trip to the ancient Roman city of Pompeii.
Other guest stars in the new series include Felicity Kendal, Fenella Woolgar, Tim McInnerny, Peter Capaldi, Phil Davis and Tracey Childs.

And two of the Doctor’s former assistants will return.
Billie Piper and Elisabeth Sladen will recreate their roles as Rose Tyler and Sara Jane Smith.
John Barrowman, who plays Captain Jack Harkness in spin-off series Torchwood, will also be back.

The SUN is also reporting: The series is the last for star David Tennant, 36, but he will play the Doctor in four special episodes in 2009 and in a movie version. That of course is only rumor and official word should come only from the BBC.