A Town Called Mercy had the working title, The Gunslinger. It’s the fourth Doctor Who episode to be written by Toby Whithouse, following School Reunion, The Vampires of Venice and The God Complex.

The Power of Three A Town Called Mercy Artwork—Series 7, A Town Called Mercy Moments from Mercy—Series 7, A Town Called Mercy A Town Called Mercy: Behind-the-Scenes—Series 7, A Town Called Mercy ...