What Have I Done? (audio story)

 was the second audio story in the anthology The Lives of Captain Jack: Volume Two. It was written by Guy Adams and starred John Barrowman as Captain Jack Harkness.

Publisher's summary
On the battlefields of World War I, something is hunting in the trenches. Jack must try and save the life of a wounded soldier.

Plot
to be added

Cast

 * Captain Jack Harkness - John Barrowman
 * Ata - Atilla Akinci
 * Ottoman medic - Ché Francis
 * Allied soldiers - Rhys Isaac-Jones / Jonny Glynn

Worldbuilding

 * Constantinople is being targeted by the allies.
 * The Ottomans and Australians are engaged at Gallipoli.
 * Ali was Ata's late older brother who identified as a conscientious objector, though Ata tells Jack that he was a coward and a liar who had no principles. He had physically abused Ata since childhood.
 * Jack admits that he still fears death even after experiencing it so many times, remaining ever uncertain whether his next death will be his last.

Continuity

 * Earlier in the war, Jack was recovering from a shot to the head at a hospital during the Christmas truce. (COMIC: The Forgotten)
 * Every time Jack dies, he sees a glimpse of the blackness. (TV: Everything Changes etc.)
 * Jack will acknowledge his deaths during World War I when he meets the Tenth Doctor. (TV: Utopia)
 * The Fourth Doctor was present at Gallipoli. (PROSE: Direct Action)