Demons Run Demons Run ( also known as Demon ' s Run ) was an asteroid used as a military base by Madame Kovarian and an alliance from the Church which included Anglican marines and the Headless Monks . Amy Pond was held prisoner and gave birth to her daughter here . Soon after , it was the site of the Battle of Demons Run , in which the Eleventh Doctor attempted to rescue Amy and her baby . It was evacuated over the two days following the battle . History . Some time after Amy ' s honeymoon on - board the Doctor ' s TARDIS , she was captured by Kovarian ' s alliance and replaced by a Ganger so perfectly synced to her that neither the Eleventh Doctor nor Amy ' s husband , Rory , would notice . As far as Amy knew , she was continuing her adventures with the Doctor and Rory . In reality , Amy was taken to Demons Run in the 52nd century , where Madame Kovarian could monitor her pregnancy . ( TV : " The Almost People " ) With access to Amy ' s baby in the embryonic stage of her development , Madame Kovarian was able to steal Melody Pond ' s DNA and used it to create seven clone s : Tarn , Rindle , Wadi , Creek , Stream , Beck , and Lake . ( AUDIO : " The Lady in the Lake " ) After the Doctor discovered Amy ' s ganger and terminated it , Amy then woke up on Demons Run at full term , just before giving birth to Melody . ( TV : " The Almost People " ) The Doctor assembled an army of allies from many races and time periods , while Rory attacked the Twelfth Cyber Legion to intimidate Amy ' s captors . A month after Amy woke , Demons Run was attacked by an army of Silurian s and Judoon led by Sontaran Commander Strax . A squad of spitfire s destroyed Demons Run ' s communications array so the alliance could not call for help . The Doctor , Madame Vastra , and Dorium Maldovar raided the computer records left behind , discovering surprising information about Melody . The forces under Colonel Manton surrendered , but this was a trap for the Doctor ; after most of his forces had withdrawn , the holding forces were slaughtered by the Headless Monks . Only the Doctor and a few friends survived and Melody Pond was spirited away by Madame Kovarian . River Song appeared after the battle to reveal her identity to the Doctor , who left the base before telling River to return Vastra , Jenny , Amy and Rory to their own time . ( TV : " A Good Man Goes to War " ) Two days after the battle , Madame Vastra and Jenny returned to Demons Run to recover the seemingly deceased Strax . They woke him up and revealed that he had not died since they had used alien technology to heal his wounds . Jenny explained that he had never truly passed away thanks to the resurrection technology and he had been in a state of unconsciousness for two days while the resurrection device healed him . Though Strax was angry about not having died , Vastra and Jenny announced that the station was being evacuated , and offered to take Strax with them back to Victorian London . Strax was hesitant and at first rudely refused but then changed his mind and agreed to accompany them . ( WC : " " ) Etymology . The etymology for the asteroid ' s name , according to Dorium Maldovar , came from the saying , " Demons run when a good man goes to war , " possibly hinting at the battle of Demon ' s Run . The following poem also used the saying : Behind the scenes . Spelling . The name of this location has been spelled two different ways with and without an apostrophe . On signs that appear on screen the name is written without an apostrophe as " Demons Run " . However the on - screen titles display it as " Demon ' s Run " .