Star Trek: The Original 4 Movie Collection 4K UHD + Blu-ray Set. The boxed set comes with two 4-disc cases inside of it. One has the Ultra HD Blu-ray versions of the movies, and one has standard HD Blu-ray discs. The Blu-ray discs feature the same newly restored versions of the films, just in 1080p.
The short version: These four movies look amazing. They look like films again, far less processed than the previous releases, and that alone makes the set worth getting. The wider color gamut of Ultra HD allows for richer colors; for example, the "monster maroons" are a shade of rich deep red....