David Tennant's advice to The Doctor's new companion: 'Watch your back!'

Mar 23 2012, 11:02 | Tom Mansell and Simon Reynolds

David Tennant says that the new Doctor's companion, Jenna-Louise Coleman has got a great experience ahead of her, but also warns that she should 'keep her nose clean and watch her back'! Jenna-Louise Coleman: Ten Things about the new 'Doctor Who' star