Khalid Nassour's story chronologically continues from Convergence: Aquaman #1, in which he made his first appearance in the "Divergence: Doctor Fate" story.
There was an earlier proposed series titled Doctor Fate (Volume 4) written by Steve Gerber in 2007 and starring Kent V. Nelson. This series was never published due to Gerber's health problems, and it was reworked into the mini-series Countdown to Mystery. Despite this, there is still some existing cover art from that series that never made it to publication. Paul Gulacy designed this cover for the original Doctor Fate (Volume 4) #1.
In an earlier preview of this comic book, the protagonist is named Khalid Nassor.
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The flood comes. 
