Given the question: Build a movie plot around this: What is locked to Michael Marks neck? A venus flytrap like helmet full of spikes
The answer is:
The film opens with Michael (Noam Jenkins), a police informant, finding himself ensnared in a deadly trap created by the Jigsaw Killer (Tobin Bell). A videotaped message informs him that a Venus flytrap-like helmet full of spikes has been locked around his neck and will close on his head unless he finds the key in time. Michael realizes, through hints left by Jigsaw, that the key has been implanted behind his right eye. He finds a scalpel nearby, but cannot bring himself to cut out his own eye. When the timer runs out, the device slams shut, killing him instantly.After arguing with his rebellious teenage son Daniel (Erik Knudsen), Detective Eric Matthews (Donnie Wahlberg) is called to the scene of yet another death perpetrated by Jigsaw on account of his name being written on the wall. Noticing that a padlock on the iron maiden-like device around the victim's neck bares a Wilson Steel logo, he gathers a SWAT team and arrives at the company's abandoned factory, which has now become another lair of Jigsaw's. A set of computer monitors shows several people trapped in a mysterious house, with Daniel among them; a timer is also present, with less than two hours left. Considerably weakened by his rapidly-advancing brain cancer, Jigsaw informs detective Mathews that he will see his son in a "safe, secure state" if he can sit in the room and converse with him long enough.In the house, the kidnapped people are trying to figure out how they got there. One person is passed out on the floor and later turns out to be Amanda Young (Shawnee Smith), a familiar face from the first Saw film wherein she was the only character to escape her trap. There are six people in addition to Daniel and Amanda, and none of them knows who the others are. Amanda finds a cassette player and a note falls to the floor. She plays the cassette and they all learn that the door to the house will open in three hours but a toxic nerve gas is leaking into the house which will kill them in two hours unless they can find antidotes. One of these is in a...