Warning! Preview pages ahead for Batman/Superman: World's Finest #20!There’s one alternate reality that disturbs the Flash far more than the war-torn reality of Flashpoint ever could. The biggest mistake of Barry Allen’s life showed him a DC Universe that was close to annihilation. But a brief foray through the multiverse reveals an even worse variant of his home to the Fastest Man Alive.

The Flash saw firsthand what could go wrong when someone plays around with the timeline. After traveling back in time to save his mother from being murdered at the hands of the Reverse-Flash, Barry wound up creating a diverging timeline known as the Flashpoint, a radically different world that was teetering on all-out war.

The Flash eventually fixed his mistake, undoing the split timeline and bringing his world back to normal (or as normal as it could get during the New 52). The Flashpoint, however, managed to live on thanks to the manipulations of Batman, who contained a stabilized version of the timeline in a snowglobe imbued with Doctor Manhattan's temporal energies.

The Flash Thinks Kingdom Come's World is Far Worse than Flashpoint

In a preview for Batman/Superman: World's Finest #20 by Mark Waid and Dan Mora, Flash is mapping out the multiverse, in awe of just how vastly different the other worlds are from his own. He passes by universes that are home to notable DC Comics stories such as Injustice, Gotham by Gaslight, and even Flashpoint. But Barry is passed by the Flash of Earth-22, home of Kingdom Come and upon witnessing what lies within the world, Flash notes that there's "serious cause for alarm". Flash speeds back to his world to find Batman and Superman, informing his allies that he's found Superman's former sidekick and that something is "terribly wrong".

Superman's forgotten sidekick Boy Thunder was introduced in an earlier arc of World's Finest. It was revealed that David Sikela was actually the young man who would grow up to be Magog, the cruel, new-wave hero who instigated the ideological war in Kingdom Come. Kingdom Come is a dark look at a potential future for the DC Universe where the old guard of heroes has been pushed aside in favor of heroes who are violent and out of control. Given how much pain and suffering there is in Kingdom Come, it's no surprise Flash finds it a lot more scary than the grim reality of Flashpoint.

Kingdom Come is Much More Terrifying Due to its Probability

While the Flashpoint timeline was quite screwed up, it only came into existence due to Flash messing with the past. It's not something the DC Universe could actually become one day. However, Kingdom Come is set in the future and serves as an ominous warning of what the DCU could look like. Granted, the future is malleable and there's no indication that the Prime DC reality will look anything like Earth-22. However, for Flash, the idea that his allies could fracture and fight as the death total is well into the millions is a far more unsettling concept than something like Flashpoint. Batman/Superman: World's Finest #20 goes on sale October 17th.