The Battle of Demons Run: Two Days Later is a mini-episode that served as a sequel to TV: A Good Man Goes to War and a prequel to The Snowmen. It was first released onto the US iTunes Store and Amazon Instant Video in late March 2013, just prior to the launch of the second part of Series 7, which was 20 months after A Good Man Goes To War and 3 months after The Snowmen. It explained how Strax survived an apparently fatal shot from the Battle of Demons Run, and how he ended up living with Madame Vastra and Jenny Flint in 1888 London.

In the aftermath of the Battle of Demons Run, a battled-scarred Strax lies dead on the floor — or has he just fainted...

Strax is woken up by Madame Vastra and Jenny Flint, and is told that he had not died since they had used alien technology to heal his wounds. Jenny says 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. He's angry about not having died. Vastra and Jenny then announce that the station is being evacuated, and they offer to take Strax with them back to London. Strax is hesitant and at first rudely refuses but then changes his mind and agrees to accompany them.

博士带克拉拉去宇宙旅行，去到了一个宇宙集市。克拉拉遇见了名为玛丽的被选择为“年岁女皇”的小女孩，为了不让那里的“神明”醒来而需要唱颂歌。

但玛丽被抓走了，博士和克拉拉便开始新的冒险去救回玛丽，他们又将如何面对接下来的挑战呢？