Fallout's first season has gone down a treat with most fans, giving us eight episodes of Fallout goodness that some even consider to be a rather unorthodox sequel to the game series. However, between all the glowing reviews and excited praise, there are a certain section of fans that are unhappy with some of the changes to the lore that the show made, particularly regarding the NCR and the canon status of Fallout: New Vegas.
Shortly after release, a section of the Fallout community exploded after the show seemed to imply that Shady Sands had been nuked before the events of Fallout: New Vegas, with some assuming this meant that all the events in the game couldn't have occurred. It's not very clear in the show itself, and it forced Bethesda's Todd Howard to come out and reiterate that New Vegas is still considered canon.
Fallout creator Tim Cain has a rather different viewpoint on lore changes though, as he recently explained in a review of the show (he likes it) on his personal YouTube channel that he thinks the lore of a big franchise like Fallout eventually drifting away is "inevitable." He also explains that Fallout has a history of changing the lore slightly upon each new release, and that it shouldn't be all that surprising that the Fallout TV show has done the same.
Interestingly, Cain also believes that Fallout is a lot like Star Wars and Marvel when it comes to lore, and how certain elements have changed over time. He specifically mentions how the Midi-chlorians were introduced in The Phantom Menace, tiny beings that live in a person's cells to make them sensitive to the Force, which he was baffled by but had to get used to as a Star Wars fan.
He also says that establishing and maintaining lore in a series as massive as Fallout is just very difficult to do anyway, and that "sequels are hard" to make. When you have over half a dozen titles in a series that spans over 200 years of history, things are inevitably going to end up being slightly altered in
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