Summons From Gallifrey: A Doctor Who Podcast

The Doctor, Jamie and Zoe arrive on an unnamed planet. At first believing themselves to be in the midst of World War I, they realize it is one of many War Zones overseen by the War Lords, who have kidnapped large numbers of human soldiers. Infiltrating the control base, the Doctor discovers that the War Chief is also a member of his own race. The creeping realization sets in that the Doctor cannot solve this problem alone, and that his days of wandering may be at an end...