The last month of summer begins this weekend, giving us only a few more chances to get out of the doldrums that have plagued the box office for much of July with two movies that will try to turn things around. Marvel Studios' Guardians of the Galaxy, directed by James Gunn and with a wildly diverse cast, is going to be the big "must see" event of the weekend, leaving a lot of people wondering how much is possible for a Marvel movie with very little starpower and based on a lesser-known group of characters.