The Battle of Demons Run: Two Days Later (webcast)

 served as a sequel to TV: A Good Man Goes to War and a prequel to The Snowmen. It explained how Strax survived a fatal shot from the Battle of Demons Run, and how he ended up living with Madame Vastra and Jenny Flint in 1888 London. It was first released onto the US and  and, despite being a prequel to the 2012 Christmas special, it wasn't released until late March 2013, just prior to the launch of "Series 7B."

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

Plot
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 said 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.

Cast

 * Strax - Dan Starkey
 * Madame Vastra - Neve McIntosh
 * Jenny Flint - Catrin Stewart

Crew

 * Writer - Steven Moffat

Story notes

 * This story was first released in the United States of America.

Continuity

 * Strax was struck down by a Headless Monk. (TV: A Good Man Goes to War)
 * Strax teams up with Vastra and Jenny. (TV: The Snowmen)
 * Strax later uses the advanced technology used to heal him to attempt to save Clara Oswald, but her injuries were more severe than his. (TV: The Snowmen)
 * Strax has trouble differentiating between males and females. (TV: The Snowmen)
 * Strax proclaims that "it's a glorious thing for a Sontaran to die in battle." (TV: The Poison Sky) He'd previously stated that he'd "often dreamed of dying in combat." (TV: A Good Man Goes to War)
 * He considers informing them that he looks forward to someday killing them on the battlefield to be a compliment. (TV: A Good Man Goes to War)
 * Jenny states that their lifestyle involves a lot of running. (TV: The Doctor's Daughter, Forest of the Dead, Amy's Choice)