The Regulators by Richard Bachman
Poplar Street is an idealistic neighborhood street in Ohio. The neighbors know each other and (mostly) get along. But one hot, sunny July afternoon things get very bad very fast.
Audrey Wyler has taken in her autistic nephew Seth. His parents, brother and sister were all killed in a drive[by shooting out in California. On their last family vacation, while visiting an old mine in Nevada, Seth was invaded by an ancient spirit who calls himself Tak. Tak lives by draining the energy out of others.
Tak brings all of Seth's favorite TV shows out into reality when his energy levels are high. Seth likes westerns-particularly Bonanza and a sci-fi cartoon with lots of high-tech weapons. And as these weapons kill the residents of Poplar Street, Tak's energy and control grow. Pretty soon the surrounding town turns into the Nevada desert, shutting off any chance of help from the outside world.
I liked this book. It was a quick red and kept me interested although I have to admit I've read it before. But all I remember from the previous read is that I liked it. That's a gook enough reason to reread a book.