This Video Gives A Rather Lengthy But Comprehensive Breakdown Of The INSIDIOUS Franchise
Insidious is one of the best horror franchises of the modern era, but it isn't always the easiest franchise to follow. While I grasp the general concepts of the film franchise, there's some stuff that may get lost in translation due to the film jumping back and forth between the past. If you're looking for a rather lengthy explanation that breaks down the first three films and the relevance of all its dead and undead characters...this video is the perfect resource.
It's also great if you saw the first film but then peaced out after it and want to see whats happened since, so check it out.