The film's plot centers on a comet discovered by Wood's character, Leo Biederman, during an Astronomy club star party, which is on a collision course with Earth. The government begins preparations for stopping the comet, involving a crew of astronauts (Duvall, McCormack, Eldard, Underwood, Favreaud, and Baluev) being sent to try and blow up the comet using nuclear weapons. As a backup plan, they built a network of caves on Earth to hold a million people underground for two years, instituting a lottery system to randomly select anyone under 50 to be taken to the caves. It is partly an action movie, but mostly a blend of suspense and drama centered around the attempt to destroy the comet.
The 4k set is a two-disc set containing a UHD disc (with just the movie) and a standard Blu-Ray disc with the movie and extras. The A/V quality of the film in the UHD format is excellent. The video transfer is not reference-quality, but it is a substantial upgrade over the DVD and 1080p versions of the film. The audio track is the same 5.1 lossless track created when the film was released on Blu-Ray. The extras were all carried over from the Blu-Ray release and include a commentary track on the movie by Leder and visual effects supervisor Scott Farrar, a few short making-of and behind-the-scenes featurettes, a photo gallery, the teaser trailer, and the theatrical trailer.
The movie was the "other" disaster film from 1998, along with Armageddon, which had a very similar plot and was the bigger summer blockbuster of that year. Deep Impact was arguably the better, more scientifically accurate movie (though it did stretch things, such as the idea that Earth's surface would be livable two years after a "planet-killing" comet hit it). Ultimately, it is well-written and acted with a great mix of action, drama, and suspense (and gets quite sad at the end). It is absolutely worth watching.