A band of renegades on the run in outer space get in more hot water than they anticipated in this sci-fi action-adventure adapted from the television series Firefly. In the 26th century, the galaxy has been colonized by a military force known as the Alliance, but its leadership has not gone unquestioned. The Alliance was once challenged by a league of rebels known as the Independents, but the Alliance emerged victorious after a brutal civil war, with the surviving Independents scattering around the galaxy. Also wandering the edges of the galaxy are the Reavers, who have won few allies due to their violent behavior and habit of ripping apart their enemies and eating them before they're dead. Capt. Malcolm "Mal" Reynolds (Nathan Fillion), who fought as an Independent in the galactic war, is the head of Serenity, a rogue frieghter ship whose crew includes Mal's first mate, Zoe (Gina Torres), who fought alongside him in the war, her husband, hotshot pilot Wash (Alan Tudyk), sunny but dependable mechanic Kaylee (Jewel Staite), and hard-nosed gunman Jayne (Adam Baldwin). The crew of Serenity wander the galaxy, taking on whatever work they can get, from criminal activities like smuggling and stealing to legitimately offering transport to travelers. Passengers aboard Serenity include professional "companion" Inara (Morena Baccarin) and holy man Shepherd Book (Ron Glass), but the real trouble aboard the ship comes with the arrival of Simon (Sean Maher) and his teenage sister, River Tam (Summer Glau). In time, the crew discovers that River has remarkable psychic powers and was being held captive by Alliance forces until Simon came to her rescue. Now the Alliance is hot on the heels of Serenity and its passengers, with The Operative (Chiwetel Ejiofor), a sinister Alliance tracker, leading the chase. Serenity was written and directed by Joss Whedon (in his directorial debut), creator of Firefly, which only lasted 11 weeks on the air but gained a powerful cult following who rallied to get the show released on DVD after its cancellation, leading to impressive home-video sales and and an eventual motion picture deal. A couple of months prior to Serenity's theatrical release, reruns of Firefly were picked up by the Sci-Fi channel, adding even more fans to its cult following.~Mark Deming
Visual Commentary - Watch the Director and Cast Feature Commentary
Picture In Picture - Watch interviews, rehearsals and behind-the-scenes footage alongside the movie
Digital Tour of Serenity - Examine the design and functionality of the Firefly-class ship
Mr. Universe's Compendium - Dive deeper into the Serenity Universe as you explore data on organizations, weaponry and personnel
Feature Commentaries with Director Joss Whedon and Cast Members
Deleted Scenes with Commentary by Director Joss Whedon
Future History - The Story of Earth That Was
What's in a Firefly
Re-Lighting the Firefly
Joss Whedon Introduction
Take a Walk On Serenity
A Filmmaker's Journey
The Green Clan
Nathan FillionCapt. Malcolm "Mal" Reynolds
Jewel StaiteKaylee Frye
Summer GlauRiver Tam
Sean MaherDr. Simon Tam
Chiwetel EjioforThe Operative
Ron GlassShepherd Book
David KrumholtzMr. Universe
Jack N. GreenCinematographer
David NewmanComposer (Music Score)
Barry ChusidProduction Designer
Alisa TagerExecutive Producer
Christopher BuchananExecutive Producer
David LesterExecutive Producer
Ruth E. CarterCostume Designer
Arthur RochesterSound/Sound Designer
Rich SicklerFirst Assistant Director
Chad StahelskiStunts Coordinator
Space Adventure,Sci-Fi Action,Hybrid Western
Year of Release
2 Discs, Blu-ray/DVD, Includes Digital Copy, SteelBook
stereo, Dolby Digital w/ sub-woofer channel
English, French, German, Italian, Spanish
Dutch, English, French, German, Italian, Spanish
Serenity [SteelBook] [Includes Digital Copy] [Blu-ray/DVD] [2 Discs] 
If you are interested in the 4k version of this film, you more than likely you know the story, so my review is based on new video and audio formats.
I have purchased the DVD then Blu-ray and finally the 4k version.
This release is by far the best this film has ever looked. I thought the Blu-ray had a good picture and the audio was decent. The 4k is so much better than I thought possible.
The 4k remaster is fantastic. The HDR is very evident in the way colors pop. With the 4k you get the usual upgrades of clarity and sharpness. Clothing has texture and color that are major improvements over the standard Blu-ray. In the opening sequence there is a vast improvement that gives the film a new depth of field -- almost a 3D quality. In the darker scenes there is improvement in fine detail. You can pick up objects in shadows that were lost in past versions. Because the movie has lots of scenes in both sunlight and the darkness of space, it's a great film to show off your equipment.
The new DTS-X soundtrack makes great use of the overhead and surround speakers. Dialog is very clear even in scenes with lots of action. While all speakers get a great workout, it doesn't feel forced and of the sound effects feel like they belong.
While 4k is still relatively new, this movie is one of the best upgrades from Blu-ray that I've seen so far. It's the first movie that I would give a 5-star rating based solely on audio and video.
The plot picks up a short while after the TV Series, "Firefly", left off. The pre-title teaser provides backstory for those unfamiliar with the TV series. The events in the teaser occur prior to the first episode of the TV series. After the teaser, we find the 25th century spaceship "Firefly" class freighter "Serenity" captained by former Independent soldier Malcolm about to enter the planet Lilac's atmosphere on one of the crews' not always legal jobs; this time a bank heist. When the renegade crew of Serenity agrees to hide a fugitive on their ship, they find themselves in a battle between the relentless military might of a totalitarian regime who will destroy anything to get the fugitive girl back. But, the greatest danger of all may be on their ship. This space opera is written and directed by Joss Whedon (Buffy, the Vampire Slayer, The Avengers, Agents of S.H.I.E.L.D.) and is thus filled with what the Sci-Fi buff wants in a movie in this genre.
This movie, which wraps up the series, is one of my all time favorite viewing pleasures. If you never watched the series (look it up and do so, you won't regret it) you can still watch this movie and get along well enough. Just be aware it's a western in space with lovable characters, and any fan of the series will tell you that is was ended unjustly, unfairly, and undeniably to soon.
By the way, This is a 4k replacement of my blu-ray, that's how much I love it.
This was the only canceled series ever to be canx in the first year, then make a movie. it was a hit! political issues hurt this franchise and killed a great thing. another democratic blunder. This movie is great, has amazing FUNNY lines, fast action, really sets a nice pace. The sound is great, can't say enough good things about the sound, it has what you expect for the money you spend on a disk of this magnitude, the money they spent was well placed. You get high quality content. The CGI is so realistic you forget its CGI and just fall into the story and lose yourself in the emotion and staging of the drama and action.
This review is from Serenity [SteelBook] [Includes Digital Copy] [4K Ultra HD Blu-ray/Blu-ray] [Only @ Best Buy] 
I would recommend this to a friend
Rated 5 out of 5 stars
Owned for 1 year when reviewed.
I watch from time to time. I had it in bluray and upgraded to 4k.