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Commander Strax was a Sontaran commander who was forced to serve as a nurse to restore the honor of his clone batch. He fought and died at the Battle of Demons Run to repay the Doctor, to whom he owed a debt for saving his life. Strax was later resurrected by Vastra and Jenny Flint and lived in Victorian London with them, acting as their butler.
Later in life Strax was one of many people who owed the Doctor a debt. He became, rather unwillingly, a nurse at some point in his life, claiming it was to restore the honour of his clone batch.
In the year 4037, Strax was tending to human soldiers at the Battle of Zaruthstra when he was summoned by the Doctor to help in the mission to rescue Amy and her baby at Demons Run, which offered him a chance to once again experience the pleasure of battle. He was seriously wounded in the battle with the Headless monks when one struck him from behind with its sword. As he struggled with what he believed to be his last breaths, Strax noted how he had once longed to die in combat, but now he didn't find it as enjoyable as he had thought it would be. Rory tried to comfort him, saying he was sure he would recover, but Strax reminded Rory that he was a nurse, too. However, he admitted that he had had a good life, and was pleased to live nearly twelve years.
Following his death Strax was brought back to life by Jenny and Madame Vastra, using the same device with which Strax would later effect Clara Oswin Oswald's resurrection. Indeed, the Doctor later explicitly told Oswald that Strax died and had been resurrected. However, at the precise instant he regained consciousness at Demons Run — two days after sustaining his fatal injuries — Jenny de-emphasised the severity of his wounds by telling Strax that he had just fainted. This annoyed the Sontaran who had wanted to have the glory of dying in battle. The Victorian couple then offered to take him home with them to 1888 London. At first he declined, but quickly changed his mind.
He went on to assist Madame Vastra and Jenny in Victorian London as part of the Paternoster gang of investigators.