The original trilogy was the brain-child of Irrational Games founder Ken Levine, and although infinite realities essentially allows for infinite story possibilities, muddying the timelines by having DeWitt be the protagonist again feels as though it would be ill-advised. It seems unlikely that Booker DeWitt will reprise his role as protagonist in BioShock 4. In fact, he's much more likely to appear than the protagonists of BioShock 1 and 2, since Jack and Subject Delta weren't voiced and don't have any personality to speak of. However, since basically anything is possible narratively thanks to those infinite realities, it's not out of the question that Booker DeWitt could make an appearance somehow.

It is already rumored – once again through a Cloud Chamber job posting – that the BioShock 4 won't take place in Rapture or Columbia, the two retrofuturistic cities where all three games have taken place. Near the conclusion of Infinite it is revealed that there are innumerable accessible realities in the world of BioShock. Related: Will Bioshock Be The Next Big Next-Gen Remake? While none of the previous games have shared protagonists, the ending of Infinite drastically changed the scope of the BioShock universe by making the possibilities for future games – well, infinite. The narrative of BioShock Infinite is wrapped up in the game's DLC, Buried at Sea, the second and final part of which released in early 2014.

DeWitt is a former Pinkerton agent, disgraced and discharged for his involvement in the Wounded Knee Massacre, who is hired to travel to the floating city of Columbia to free a young woman from the ultra-nationalist, radical leader of the city. Booker DeWitt was the protagonist and playable character in the critically-acclaimed third installment in the series, BioShock Infinite.

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