AMC has debuted the second trailer for Breaking Bad, which debuts its fourth season with Episode 4.01: El Topo on Sunday, July 17 at 10 PM ET. Click on the video player below for the latest peek inside the new season of this hit series. The network has also provided us with a set of publicity photos from the show. Click on the photos below, which feature clues to who might be looking over Walter and Jesse this season, to access our new gallery.