There are officially seven chapters, but the first three started it all. The 5-disc collection "Saw Trilogy" features the 2004 original and its two equally bone-chilling sequels. "Saw" introduces the sadistic killer Jigsaw and his first batch of victims,including two men who are given the option to saw off their feet in order to escape. "Saw II" (2005) finds Jigsaw squaring off with the cops who have played his game. The killer has vanished in "Saw III" (2006), but he has an apprentice carrying out hisevil plans. "Saw Trilogy" includes the uncut, director's versions of all three films.