The BioShock series is arguably one of the most important video game franchises of all time. The first-person shooter games not only contain intense action and excellent gameplay, but also feature a complex narrative and an intriguing plot that few other FPS games have managed. Having such an interesting story that spans across all games of the franchise and their respective DLC packs means that there are plenty of BioShock mysteries for fans to discover.
The fan theories from the BioShock games are easily some of the most complicated and well thought-out in gaming. They range from trying to make sense of the confusing ending of BioShock Infinite to proposing new ideas about how the protagonist and antagonists are intrinsically linked throughout all three titles. So if you are a big fan of the franchise, read these conspiracy theories about BioShock and vote up the ones that are so brilliant, they might be true.
Several users over at Irrational Game’s forums believe that the ending of the series might actually mean Elizabeth and Booker have finally found peace. The brief post-credit screen shows Booker heading over to a crib, with some believing that this means the two are now able to live together peacefully as father and daughter. This would mean that both have managed to survive their apparent deaths at the end of BioShock Infinite and Burial At Sea.
The first game in the series has a moment towards the end that sees the player apparently kill the Rapture founder, Andrew Ryan. He is beaten to death by Jack, due to the manipulation of Fontaine. However, Redditor /u/Bigspartandaddy believes that this may have been a setup by Ryan to escape from Fontaine without his knowledge.
Although the only nearby Vita Chamber in his office is shown to be off when he is killed, BioShock does reveal that the player can respawn over quite large distances using the chambers. This allows for the possibility that Ryan was revived outside of his office, meaning he could have ran away without anyone noticing.
The ending of BioShock Infinite might be confusing to many players, but it does reveal some rather interesting information about protagonist Booker DeWitt. According to the ending, the hero is actually numerous different people, thanks to the parallel universes that allow individuals to take various forms. He's even confirmed to be Comstock, the creator of Columbia.
Paul Tassi, a writer for Forbes, takes this new information from Infinite to theorize that Booker might also be Andrew Ryan from the first game. The evidence comes from the fact that he is able to use Ryan’s Bathysphere to escape Rapture - something that should not be possible unless they both share the same DNA and gene frequencies.
Prior to founding Columbia, Comstock/Booker did some pretty horrible things in the Battle of Wounded Knee. On that day in history, US soldiers massacred somewhere between 150 and 300 Native Americans on a reservation in South Dakota. Comstock/Booker definitely bloodied his hands, and the two characters diverge based on their reaction to the prospect of being baptized afterwards (Comstock accepts the baptism, Booker does not).
According to Redditor /u/spoonmokey, Comstock truly believes the baptism cleansed him of sin, and his redemption confirms his belief that God is a white supremacist. This experience leads him to set up the racist city of Columbia, as he thinks he is following God's plan by practicing segregation. In contrast to this, Booker rejects the baptism, takes responsibility for his actions at Wounded Knee, and is horrified by the bigotry he encounters in Columbia.