Matt Damon reteams with his "Bourne Supremacy" director to create a thriller grounded in contemporary politics: the search for weapons of mass destruction in Iraq. Chief Warrant Officer Roy Miller (Damon) travels across war-torn Iraq, pursuing the intelligence he's been given, but every site indicated comes up empty of WMDs. Investigating the source of the intelligence, he finds himself caught between CIA agent Martin Brown (Brendan Gleeson, "28 Days Later") and politician Clark Poundstone (Greg Kinnear, "Little Miss Sunshine") over the identity of "Magellan," the supposed source. As Miller tracks down an Iraqi general, he ends up further and further afield, facing danger from all sides. It's hard to say which is the greater accomplishment--that "Green Zone" manages to turn a still-volatile political issue into a propulsive action movie, or that it manages to depict Iraqi people as individuals with a wide range of responses to what's happened to their country. Damon's performance is low-key but effective as Miller tries to maintain some semblance of moral clarity in a circumstance that muddies everything. Also featuring Amy Ryan ("Gone Baby Gone") as a compromised journalist and Khalid Abdalla ("The Kite Runner") as an Iraqi civilian who gets dragged into far more than he expected. "--Bret Fetzer"