'Who' boss reveals Morrissey helped Tennant

Doctor Who showrunner Russell T. Davies has revealed that the casting of David Morrissey for the Christmas Special helped to boost David Tennant's spirits.

"David's been on our wishlist since the beginning," Davies told Doctor Who Magazine. "It was particularly good for David Tennant, cos we were at the end of a very gruelling shoot, making 15 episodes in a row for the first time ever."

"So for him to have a good friend coming on board, right at the end, was a real boost," continued Davies. "And the way they play off each other is simply brilliant. Two great men, at the top of their game."

Morrissey and Tennant previously starred together in the 2004 BBC drama Blackpool.