The 27-minute version of this is on the second DVD on the 2-Disc release of The Matrix Revolutions, and is what I base this review on. I do not know where the extended cut is. This is a making-of documentary, dealing with the entirety of the film. It consists of storyboards, artwork, pre-vis, behind-the-scenes footage, interviews and clips of the movie. It goes over all of the big scenes, and provides accounts of those involved, details on how they did it and, where applicable(yes, that is a joke), what technologies they used, or similar. The people who speak have stuff to say, be it enlightening or just giving you a description of what it(the entire feature or the specific part) was like to do, or to be part of it. This provides you with an idea of just how huge the Siege sequence was. It's informative and entertaining. It's well-edited, and doesn't overstay its welcome. The pacing is fitting, the half hour is well-spent. This goes over the replacement of a certain actor, for a good reason, that those who have already seen these sequels already know. I recommend this to anyone who wants to know more about the creation of the third of the series. 7/10