The Doctor meets the most important woman of his life on the distant planet Messaline, in the middle of an endless war, as Russell T Davies's Bafta Award-winning time-travelling drama continues.

But as General Cobb threatens genocide, and Martha is kidnapped by the Hath, the Doctor faces an even greater battle – can he find peace with his own child?

David Tennant plays the Doctor and Catherine Tate plays his new companion, Donna Noble. Freema Agyeman and Georgia Moffett guest star. tephen Greenhorn previously wrote the Lazarus Experiment