Saw IV

An autopsy of the Jigsaw Killer reveals a wax-coated microcassette in his stomach, and Detective Mark Hoffman is told to listen to it. The tape promises him that "the games have just begun." In a mausoleum, a man named Trevor and a lawyer named Art Blank are chained to a large device. Trevor's eyes have been sewn shut, and Art's mouth has been sewn shut, making communication between them impossible. When the device begins pulling them together, they panic, and Art kills Trevor to retrieve a key from his collar.

Meanwhile, the police discover the remains of Detective Allison Kerry. Hoffman cautions Officer Daniel Rigg for barging through an unsecured door in attempt to save Kerry. Hoffman is introduced to FBI Agents Peter Strahm and Lindsey Perez, who deduce that Amanda, Jigsaw's apprentice, would have needed assistance with Kerry's death, indicating that there is another apprentice.

That evening, Rigg and Hoffman are kidnapped. Rigg is told that Detective Eric Matthews is in fact still alive, and is given ninety minutes to save himself. He is then given his first test, where he finds an escort named Brenda strapped to a device that scalps her. He rescues her, although he is warned not to, and Brenda later attempts to stab Rigg; Rigg subdues her and learns that Brenda was told that Rigg was there to arrest her for prostitution.

Strahm interrogates Jill Tuck, Jigsaw's ex-wife, who recounts Jigsaw's backstory. She was once pregnant with a boy named Gideon but suffered a miscarriage when Cecil, a drug addict, robbed the clinic at which she was employed and slammed a door into her stomach.

Rigg's next test is at a motel, where he is instructed to abduct the manager, Ivan Landsness, revealed to be a serial rapist. Angered by seeing videos of Ivan's exploits, Rigg forces Ivan into a prearranged trap which forces him to gouge out his eyes; he fails to do it in time and the trap rips out all of his limbs. Rigg's next test occurs in a school where Rigg attacked a man named Rex acquitted of abusing his family, though Rigg's career was saved by Hoffman. In one of the classrooms, Rigg discovers Rex and his wife, Morgan, in one of the classrooms, chained back to back and impaled by several metal spikes, with Rex dead and Morgan clinging to life. Rigg tells Morgan that she must remove the spikes herself before leaving, pulling a fire alarm as he does.

Strahm and Perez arrive on the scene, where it is learned that all of the victims were defended by Art, who is also the lawyer of Jill. After a photographer is accidentally killed on the scene, Perez finds Billy, Jigsaw's puppet, in the office. She is told that Strahm will "soon take the life of an innocent man" and that her "next step is critical". Ignoring past clues that she is in danger, Perez continues with the investigation before Billy's face explodes, sending shrapnel into her face. She is rushed to the hospital in critical condition.

After learning that he had cancer and only a short while to live, as well as a suicide attempt, Jigsaw placed Cecil in a trap; Cecil then lunged at Jigsaw after escaping but fell to his death in a mesh of barbed wire. Strahm makes connections from Jill's story to the Gideon Meat Factory, the scene of Rigg's final test.

Strahm arrives but finds himself lost, accidentally trailing Jeff Denlon. Rigg, meanwhile, approaches his final test. In the next room are Art, Matthews, and Hoffman; it was revealed earlier that if the door was opened before Rigg's timer expired, Matthews' head would be crushed between two ice blocks and Hoffman would be electrocuted by a complex device. Rigg charges through the door with one second to spare; despite Matthews' attempts to stop Rigg by shooting him, he is killed. Rigg shoots Art while, in another room, Strahm encounters Jeff, who brandishes a gun, unaware that Jeff is frantically searching for his daughter. Strahm kills Jeff while Hoffman, who was never in any danger and is Jigsaw's other apprentice, rises and seals a dying Rigg and a bewildered Strahm in the factory.

In January 2007, Saw writer James Wan stated that a script was under development.[2] Leigh Whannell told Fangoria that he and Wan would be executive producers stating, "James [Wan] and I, as executive producers, are still treating it like our baby; we'll still oversee it. I've definitely been privy to the ideas they've had and the scripts they’ve been writing, and it’s coming along well. I'm actually excited".[3] That following month, Darren Lynn Bousman, who previously directed Saw II and Saw III, was announced to return as director.[4] David Hackl, who served as production designer for the two previous Saw films, was offered to direct the film, but the day he received the offer his wife was diagnosed with cancer. Producers offered him directorial duties for Saw V and Saw VI.[5]

As Whannell was uninterested in writing any more Saw films, Twisted Pictures sought new writers and ideas for the fourth Saw film, making it the first film to not be written by him. An executive discovered Marcus Dunstan and Patrick Melton and read their script The Midnight Man. The executive thought that the duo's script could serve as a prequel to the first film, detailing a traumatic event in Jigsaw/John's early life. However, producers Mark Burg and Oren Koules did not want to do a prequel and dropped the idea, but the script led Dunstan and Melton to be hired to write the next three Saw films.[6] Thomas Fenton also joined Dunstan and Melton as writer to the film. Marek Posival was attached to write at one point.[7]

Stepping into the franchise was tricky for Dunstan and Melton given the serialized nature of the Saw films, but they counted with Bousman and the crew to watch over them, pitching a trilogy which would start with Saw IV and conclude in Saw VI. The duo did not have any trouble in bringing Jigsaw back into the story despite his death in the last film, as the character had been dying since the original film, feeling that the film would not feel like a Saw entry without the character.[8] Like in previous entries, rewrites took place during the writing process, leading many unused ideas for the film to later be recycled for Saw V.[9]

Even though Tobin Bell's Jigsaw Killer character was killed off in the previous entry, in March 2007 it was announced that he signed on for Saw IV and Saw V.[10]

With a production budget of $10 million production budget,[11] principal photography took place from April 16, 2007 to May 3, 2007 in Toronto.[12][13]

Saw IV was released theatrically in the United States and Canada on October 26, 2007.[14] Lionsgate held its fourth annual "Give Til It Hurts" blood drive for the Red Cross.[15]

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• Official website
• Saw IV at IMDb 
• Saw IV at Box Office Mojo
• Saw IV at Rotten Tomatoes
• Saw IV at Metacritic