With the franchise's sixth movie, Insidious: Out of the Further recently released, it's a good time to revisit the demons that have haunted the series since the first movie came out in 2011. The Wheezing Demon (Michael Reid MacKay) is one of the worst demons in the franchise. There are still plenty of demons to come to the franchise, as Insidious: Out of the Further has already set up the franchise's next chapter.