Saw IV (2007, USA) C-96m. **½ D: Darren Lynn Bousman. Starring Tobin Bell, Costas Mandylor, Scott Patterson, Betsy Russell, Lyriq Bent, Donnie Wahlberg, Angus Macfadyen, Shawnee Smith, Dina Meyer. Horror franchise is still going strong, with this entry partly a prequel to the other films, which explains - in flashback - how Jigsaw (Bell) became the killer he was. Somebody is playing another game of torture, and this time, detective Mathews' (Wahlberg's) life is at stake. Twisted story, explicitly gory effects sure to make you cringe, film relies heavily on the previous parts, so watch this right after SAW III if possible.