Ethan. Three days ago, Agent Lindsey Farris was captured while on a surveillance operation. This is the man she was tracking. His name is Owen Davian. Details are eyes-only, but I can tell you that Davian's a black-market trafficker. Extremely dangerous and a priority for us. At 1400 hours today, a recon satellite ID'd a caravan of vehicles with plates matched those known to have been used by Davian's operatives. They stopped at a derelict factory outside Berlin. It appears they have a hostage. We believe it's Agent Farris. Normally we would disavow, but Lindsey may be the key to getting us closer to Davian, and that's a risk we need to take. Your mission, should you choose to accept it, is to find Lindsey and bring her home. I've already assembled a team. I have them standing by, awaiting your word. This message, let's call it my excellent engagement gift to you, will self-destruct in five seconds. Good luck, Ethan, and thanks again.
~ John speaking to Ethan in a modified mission briefing camera.

John Musgrave is an operative for Impossible Mission Force and the hidden secondary antagonist in 2006 film Mission: Impossible III. He is played by Billy Crudup.

Mission: Impossible III

He was the agent who assigned Ethan Hunt to rescue his kidnapped protege, Lindsey Elisabeth Farris, and bring him out of his semi-retirement. It is revealed that he is actually working with a black-market trafficker, Owen Davian, and he framed his boss, Theodore Brassel, so the other thought Theodore was the traitor. He reveals to Ethan Hunt that it is pointless to kill Davian, because more men like him would quickly take his place.

He is shot by Ethan's wife, Julia Meade, while in Shanghai, China.