 A third prequel , titled " The Battle of Demon 's Run — Two Days Later " was released on the United States iTunes and Amazon Video stores on 25 March 2013 . Two days after the events of " A Good Man Goes to War " , Vastra and Jenny convince Strax that he is not mortally wounded and invite him to accompany them back to 1800s London . The scene had been filmed as an extra due to the anticipation that fans would ask how Strax was resurrected and came to be in Vastra 's employ . 
 A third prequel , titled " The Battle of Demon <a href='null_genetive' title='1'><mark>'s</mark></a>Run — Two Days Later " was released on the United States iTunes and Amazon Video stores on 25 March 2013 . Two days after the events of " A Good Man <a href='uninflect' title='2'><mark>Goes</mark></a> to War " , Vastra and Jenny convince Strax that he is not mortally wounded and invite him to accompany them back to 1800s London . The scene <a href='been_done' title='3'><mark>had</mark></a> been filmed as an extra due to the anticipation that fans would ask how Strax was resurrected and came to be in Vastra <a href='null_genetive' title='4'><mark>'s</mark></a>employ . 
A third prequel , titled " The Battle of Demon  Run — Two dayz Later " was released on the United States iTunes and Amazon Video stores on 25 March 2013 . Two days after the events of " A gud Man Go to War " , Vastra and Jenny convince Strax that he ain't mortally wounded and invite him to accompany em back to 1800s London . da scene done been filmed as an extra due to the anticipation that fans would ask how Strax was resurrected and came to be in Vastra  employ .