Josh Holloway, best known as LOST's Sawyer, has signed onto MISSION: IMPOSSIBLE 4, reports Risky Business. He takes the role of a secret agent on Ethan Hunt's team. He joins Tom Cruise, Ving Rhames, Simon Pegg, Jeremy Renner, Paula Patton, Vladimir Mashkov and Michael Nyqvist. Directed by Brad Bird, the film will hits theaters on December 16, 2011.