The Final Days of Superman is a 2016 DC crossover leading into the Rebirth era. The storyline follows a Superman weakened by kryptonite-laced solar flares and left with diminished powers. A mysterious figure claiming to be Superman and a dangerous doppelganger create further complications.
The main DC Comics universe following the Flashpoint event and New 52 relaunch in 2011. Prime Earth (Earth-0) serves as home to the primary versions of Superman, Batman, Wonder Woman, and the Justice League. The continuity has evolved through DC Rebirth (2016) and subsequent publishing eras while maintaining its core designation.