A post-apocalyptic future Earth SF flick with alien invaders, only who are the invaders and what's really going on? That is the question, and from the trailers you can see a suggestion of what the answers might be. Nevertheless, this is an excellent movie, starting tome Cruise as the man with the questions as to what really happened and what's really going on. Hampering him and his partner is a mandatory memory whipe they underwent prior to the mission, as a security measure. Of course, one might as a security measure against whom? This is an excellent beginning to the pre-Summer season. It hits all the classic SF notes and any minor plot questions are insignigicant compared to the excitement of this movie.