This episode goes behind the scenes of Turn Left

The world is in crisis and there's only one person who can save it, but it's not who you might think. Witness the world without the Doctor, travel backstage with the TARDIS, and take a stroll down the exotic Shan Shen Alley. There is also the return of an old friend to the show in the shape of Rose Tyler. Featuring an exclusive interview with Billie Piper and contributions from Catherine Tate, David Tennant and Russell T Davies.