The ultra successful horror film franchise has Tobin Bell, Shawnee Smith, Donnie Wahlberg, Dina Meyer & Lyriq Bent returning to their respective roles for the third installment. The sadistic killer known as Jigsaw (Bell) has a brain tumor, and his assistant Amanda (Smith) forces a physician (Bahar Soomekh) to treat him. The doctor has an explosive collar locked around her neck that's set to detonate if Jigsaw's heart stops. Meanwhile a father (Angus MacFadyen) is also targeted by Jigsaw after losing his young son to a careless driver.