Christopher Eccleston and Billie Piper reunite in new Doctor Who trailer after 21 years

Christopher Eccleston and Billie Piper have officially reunited in a new Doctor Who trailer, 21 years after first appearing together in the 2005 reboot. Piper, who played Rose Tyler, returns following the show's recent season finale. The BBC put Doctor Who out to competitive tender after Russell T. Davies and Bad Wolf departed, which also led to the cancellation of the Christmas Special.