who are the character in the series of this episode?
Rory, Amy, Madame Kovarian etc
A Good Man Goes to War
Rory have discovered Amy, 
when a good man goes to war demons run UNANSWERABLE which series does it belong to? Sixth series of the British science fiction television series "Doctor Who". which network was it aired on? BBC One where was it filmed? It was filmed in a military base and hangar in Cardiff.
wiki:13726750
A Good Man Goes to War [SEP] Synopsis
The Eleventh Doctor and Rory have discovered Amy, Rory's wife and the Doctor's companion, has been abducted from them and her place taken by an avatar made from "the Flesh", a semi-sentient shapeshifting material. The Doctor tracks Amy's location to an asteroid base called "Demon's Run", and he and Rory gather several of his allies to attack. Rory tries to convince River Song to help, but she insists that she cannot since this battle is where the Doctor will learn of her true identity. At Demon's Run, Amy has been held by Madame Kovarian, and has taken her infant daughter Melody Pond.