But for one brief moment, the film shifts from its solely human focus to a broader look at what's going on in the rest of Middle-earth — specifically, Mordor. SEE ALSO: 'The Lord of the Rings: The War of the Rohirrim' review: What if Éowyn got her own movie?

The Lord of the Rings: The War of the Rohirrim is a fascinating experiment in adaptation. It's not adapting a novel of J.R.R. Tolkien's, but rather two pages from his Appendices, which lay out the last great stand of one of Rohan's most famed kings, Helm Hammerhand (voiced by Succession 's Brian Cox ).

Those two groups are Sauron's allies in the War of the Ring, helping to take Osgiliath from Faramir's ( David Wenham) forces in The Lord of the Rings: The Two Towers and fighting at the Battle of Pelennor Fields in Return of the King.