A Town Called Mercy Prequel (UPDATED)
For the second time this series a Doctor Who prequel has made an unannounced appearance online. This one is for A Town Called Mercy and is entitled “The Making of The Gunslinger.” It is currently only available to iTunes subscribers, rather than on the official website where everyone can see it.
The synopsis reads: “Civil war has ravaged the Kahler race, but a team of scientists has found an advantage. The Gunslinger is born.”
UPDATE: Full version added (Thanks to Torchwood_vids)
Hopefully the full version will be available online soon.