"Part Four: The Battle for Middle-earth Begins" is the second of two Appendices of the Extended Edition of Peter Jackson's The Lord of the Rings: The Two Towers, featured in its own disc exclusive to the edition.
It contains nine documentaries, directed by Michael Pellerin, and a gallery.
- Warriors of the Third Age
- "Cameras In Middle-earth"
- "Weta Digital"
- "The Flooding of Isengard animation"
- "Editorial: Refining the Story"
- "Music for Middle-earth"
- "The Soundscapes of Middle-earth"
- "The Battle for Helm's Deep is Over..."
- Gallery of production photos