Donna Noble is determined to find the Doctor again – even if it means braving the villainous Miss Foster and her hordes of sinister Adipose, as Russell T Davies's Bafta Award-winning time-travelling drama returns for a fourth series. But when the alien threat escalates out of control, can Donna find her Time Lord before the march of the Adipose begins?

David Tennant plays the Doctor and Catherine Tate plays his new companion, the runaway bride Donna Noble. Sarah Lancashire guest stars as Miss Foster.