David Harewood
From Tardis Wiki, the free Doctor Who reference
Rumors have spread recently that David Harewood will be replacing Matt Smith's Doctor in the upcoming Christmas episode. "I am very excited to be part of a legend" said Harewood after word got out of his application. Harewood is not a stranger to the Who franchise. He also played Joshua Naismith in The End of Time. He also voiced President Vallan in Army of Death.
Harewood is also well known for his role as Brother Tuck in Season 3 of BBC's Robin Hood.