As if the "Insidious" franchise's chronological order wasn't confusing enough, streaming every movie in the series isn't as easy as booting up Max.? To begin a binge of the "Insidious" franchise in preparation for "Insidious: The Red Door," fans will first head over to Tubi, where they can stream "Insidious: Chapter 3" for free. Things get a little complicated here, as "Insidious: The Last Key" isn't available on any streaming services. Instead, fans will need to rent the movie, which is available on Prime Video, Apple TV, YouTube, and other movie rental services. Thankfully, after "The Last Key," fans can conveniently head over to Max, where Warner Bros. Discovery's newest streaming service features both "Insidious" and "Insidious: Chapter 2" in its library. From there, fans will be caught up on the "Insidious" franchise, just in time for "The Red Door."??