|DC Universe: Rebirth #1 by Gary Frank, Source: DC Comics|
DC Universe: Rebirth is a relaunch by DC Comics in 2016 of its entire line of superhero comics. In case you're not familiar with New 52 (hoo-boy), New 52 in 2011 was an initiative intended to reboot all of DC, and start over. Characters like Superman were depicted as just starting out, instead of having been around for decades. Other characters like Batman were relatively unchanged. Not everyone was happy with the changes, especially Superman fans who were disappointed he wasn't romancing Lois Lane. DC Rebirth is intended to restore the DC Universe to its pre-New 52 self, while still incorporating some popular elements of The New 52. That's the part we all knew.
But at the end of DC Rebirth #1, readers were shocked by an unexpected twist. It was revealed that New 52 wasn't caused by the 2011 Flashpoint crossover changing history as previously depicted. Instead, it was caused by Dr. Manhattan. Yes, that Dr. Manhattan. From Watchmen.