Watch Mission: Impossible III for Free: How to Stream the Movie Online at 123Movies. . Retired from active duty, and training recruits for the Impossible Mission Force, agent Ethan Hunt faces the toughest foe of his career: Owen Davian, an international broker of arms and information, who's as cunning as he is ruthless. Davian emerges to threaten Hunt and all that he holds dear – including the woman Hunt loves.