Over the three years the Descendants had protected Mayfield, a hard lesson had been shared among the career criminals and occasional supervillain that tried to operate in Mayfield: metal was a no-go.

If your plans involved a gun, knife, automobile, city street with manhole covers or street lamps or even a zipper with metal in its construction, you were taking a supreme risk. If you had implants or a prosthetic, be they a whole robotic arm or just some screws in your knee, most gangs wouldn’t bot...