After the History Channel stopped doing real history documentaries and started focussing pseudo-scientific studies (UFOs and the like) as well as pseudo documentaries (Pawn Stars) which they achieve great successes with, they also tried out (mini) series. The Drama series Vikings is one of them. The first series was immediately able to win the audience over.

In the USA the channel aired censored versions of the episodes which often used alternate scenes. Thus there is no nudity, and some of the violence during the battles was toned down. However, the latter scenes are already quite graphic and only slightly censored here and there. In France they decided to air the completely uncensored version of the series.

The US Blu-Ray is uncensored but also offers a few additions to the plot. Whether or not these scenes were cut out for time reasons (so that the episodes are roughly 43 minutes long) could not be found out. We also do not know whether or not the scenes were included in the French broadcast. Thus this might be extended material which was saved exclusively for the Blu-Ray release.

The first episode on the US Blu-ray is overall 2:05 minutes longer than the TV Version.

9:24
When Ragnar is on his way to the village and Lagertha alone at home, two men who want to rape her come to her house. The TV Version shows her dislodging them violently. However, only the Blu-Ray shows her running to her daughter who she sent to the goats moments ago. She finds her sitting in the stable. The daughter is completely terrified.
17s

12:45
Ragnar, his son Björn, and Rollo are sitting in a tavern and drink. Only the Blu-Ray version makes it clear that the boy is drunk. Additionally we only here see Rollo asking whether or not Björn - who is supposed to swear an oath in front of the Earl the next day - is ready for a woman. He says that there are a few good ones in Kattegat - some are even for free. Ragnar replies that Björn did not even grow out a beard.
18s

21:53
When they throw the severed head of the convicted murderer to the feet of his kin, you on the Blu-Ray see that one of them cries. In the TV Version we instead see Earl Haraldson a little longer.
No difference in time.

Blu-ray	TV Version

22:24
A short shot of the village while the TV Version goes to a commercial break.
3.5s

22:28
In the TV Version we see the group a little longer while the boys swear their oath to the Earl.
-2s

There's a longer plot scene where Ragnar and Björn go to the fortuneteller which in the TV Version is shown a little later than on the Blu-Ray. Apart from that the scenes are hardly different. The TV Version starts 1.5s earlier.

28:25
During the short dream sequence we see the Earl's mutilated corpse a little longer.
1.5s

35:00
Floki who builds the new boat for Ragnar is a little worried. He is running out of money. Thus he can not build sail and anchor. Fortunately, Ragnar has some more money from the raids of the last year. The TV Version shortly uses alternate footage.
BD: 26s | TV: 2s

37:38
Rollo tells Gyda longer about what a great schieldmaiden his mother used to be and that she fought as brave as a Valkyrie. The mother does not like it that he tells her daughter about this. The TV Version shortly uses alternate footage.
BD: 16s | TV: 3s

38:20
Rollo doubts Floki's abilities but Ragnar says that he is convinced that Floki will build a great boat.
15s

41:32
We see Ragnar's nice new boat a little longer.
41s