John Musgrave is one of the two main antagonists (alongside Owen Davian) of the 2006 film Mission: Impossible III.
He was the Operations Manager for the IMF who was Ethan Hunt's handler. However, it is revealed that he was a traitor within the IMF, having been in league with Owen Davian the entire time. It was Musgrave who had set up the death of Lindsey Farris and was behind the kidnapping and torture of Ethan's wife Julia. Musgrave personally intended to frame IMF Director Theodore Brassel for his crimes.