Thor is, if you are watching the MCU movies in release order, the fourth movie released after Iron Man, The Incredible Hulk, and Iron Man 2. If you are watching the movies in chronological order, it is the sixth coming after Captain America, Captain Marvel, Iron Man, Iron Man 2, and The Incredible Hulk. It tells the origin story of Thor (played by Chris Hemsworth) and his brother Loki (played by Tom Hiddleston). The movie actually opens on Earth where an astrophysicist named Jane Foster (played by Natalie Portman) and Dr. Salvig (played by Stellan Skarsgard) are tracking astronomical anomalies (along with their work-study student worker Darcy, played wonderfully by Kat Dennings who steals nearly every scene she is in) hits Thor with their van when Thor is exiled from Asgard. Then the movie flashes back to show what led up to Thor's banishment, and when the movie comes back to Earth, what we get is in part a fish-out-of-water story, in part a love story, and in part a story of a superpowered frat boy becoming a hero.
For those who get the 4K Blu-Ray set, there are two discs, a UHD disc with just the movie itself, and then a regular Blu-Ray disc with the special features. The movie looks very good and sounds great. People who are true videophiles who really pay attention to grain and black levels probably will not find the video quality as good as it is for the later movies, but most people will find it a step up from the Blu-Ray, especially with the Asgard colors and the New Mexico landscape. The extras are all ported over from the initial DVD/Blu-Ray release, and include a great commentary track on the movie with director Kenneth Branagh and then there are several behind-the-scenes and making-of featurettes that range from a couple of minutes to just under twenty minutes. Then, there is a Marvel one-shot that sets up the end scene of The Incredible Hulk and how Tony Stark was selected to go visit General Ross, the theatrical trailers, and a trailer for the new Avengers Animated movie. There is also a short look at the Avengers movie which was in production at the time Thor was released.
Overall, the movie is really good. It has a great blend of comedy, action, and drama, with a little bit of romance between Thor and Jane, mixed in (but that is kept on the backburner for the most part and does not get too over the top). The supporting cast, including Anthony Hopkins, Renee Ruso, Idris Elba, Ray Stevenson, Jamie Alexander, and Colm Feore is great, and the movie expanded the role of Clark Gregg's Phil Coulson even more than it was expanded in Iron Man 2. The post-credits scene (this was in the days when there was not both a mid-credits and post-credits scene) set up both Captain America (which was the next movie in release order) and the storyline of The Avengers. Hemsworth did a great job in the role and got absolutely jacked for it, really looking the part of a god-like hero. It is definitely a movie worth watching and the 4k disc is worth the upgrade.