This episode goes behind the scenes of Partners in Crime

Catherine Tate returns as the unstoppable Donna Noble. In her search for the Doctor, Donna finds herself face to face with the mighty Miss Foster and a larger-than-life threat against mankind. With the tension rising, the programme gets up close and personal with the Doctor's latest companion from her first days on set through to her battle against an army of sinister Adipose. Features interviews with Tate, David Tennant and Sarah Lancashire.