What are people willing to sacrifice to achieve their goals?
Part 2 of Season 4 of Vikings jumps ahead in years and is about the return of the king. King Ragnar comes back after a long absence to find that his family and friends have all found their own futures and fates without him. This is a passing of the torch as the series now comes to be about other characters and their ambitions. Like Part 1 the emphasis is on the development of the ensemble cast and less on the fighting and bloodshed. There is however a giant war at the end. What the story comes down to is what people are willing to sacrifice and there are some big ones by major characters.
The movie title "Vikings: Season 4 Vol 2 (us) [DVD]," available on Movies & TV, has received an average rating of 4.8 from 1775 reviewers. 
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This title falls under the categories of Movies & TV, MGM Home Entertainment and All MGM Titles. 
The additional details include the following in key-value format :
 {"Genre": "Action & Adventure/Television, Television", "Format": "AC-3, Dolby, DVD, NTSC, Subtitled, Widescreen", "Contributor": "Travis Fimmel, Katheryn Winnick", "Language": "English (Dolby Digital 5.1)", "Number Of Discs": "3", "Aspect Ratio": "1.78:1", "Is Discontinued By Manufacturer": "No", "Media Format": "AC-3, Dolby, DVD, NTSC, Subtitled, Widescreen", "Run time": "7 hours and 22 minutes", "Release date": "October 3, 2017", "Actors": "Katheryn Winnick, Travis Fimmel", "Subtitles": "English, French, Spanish", "Studio": "WarnerBrothers", "Number of discs": "3"}

Here is a brief synopsis of the title : Norse legends come to life in this thrilling History Channel series depicting the life and times of Ragnar Lodbrok (Travis Fimmel), an 8th-century Viking chieftain. Flanked by his wife Lagertha (Katheryn Winnick) and brother Rollo (Clive Standen), Ragnar cuts a daring path through the medieval world, exploring land and sea to challenge the weak and confront the strong-raiding for plunder and battling back against treacheries from without... and within. Gabriel Byrne, Jessalyn Gilsig co-star..