The whole team look into an abundance of cases, the death of a man who burst into flames in police custody; the death of a woman with green blood which is linked to drugs; and the death of a senior couple who were in a pest control problem with their neighbors, which are all related in different ways.
Note: Jamie Hyneman and Adam Savage make a cameo appearance as lab technicians as Nick tests the idea that a stun gun can ignite the shirt of a perp who had been maced. After subsequent massive viewer requests, they put it to the test on MythBusters and found it plausible in Fireball Stun Gun since some pepper sprays use a flammable oil-based propellant, some types of modern flannel material (especially acrylic fiber) are flammable and a stun gun is a more than viable method of ignition.