Welcome to the Future

 

–853rd century
Reference in Flash Vol. 5 #21
. Super-villains Laughing Virus and Xauron take control of the Prison Planet of Pluto. Xauron brutally murders all the prison staffers and their spouses, orphaning thousands of kids, including one little boy that swears to avenge their deaths. Year later, this survivor of the Plutonian Holocaust, inspired by the Caped Crusader of the 21st century, undergoes intense training and debuts as the dark avenger known as Batman! After establishing himself as a hero, Batman is given the task of running the penal colony on Pluto. Alongside his robotic sidekick—Robin the Toy Wonder—he battles a host of bizarre rogues and contains them on Pluto. Batman also sets up his Batcave on Pluto, complete with trophies and an extensive museum. Several of the galaxy’s most prominent criminals replicate the personalities of 21st century super-villains using nanotech viruses (or have been directly inspired by the wild villains of the 21st century). Thus, a large chunk of Batman’s rogues gallery features a bizarre assortment of freaks that resemble Bruce Wayne’s old foes. Eventually, Batman joins the Justice Legion-A and goes on many adventure with them as well.

–853rd century
Reference in Flash Vol. 5 #21
. The 21st century Justice League, having been invited by the Justice Legion-A, travels from the past to celebrate Superman (still alive and now godlike) emerge from a long hibernation inside the sun. Thanks to the meddling of Vandal Savage and Solaris, the JL-A remains trapped in the past while the JL gets stuck in the 853rd century. While the 853rd century Batman and the JL-A deal with various threats in the 21st century and paradoxically construct Solaris in order to defeat him, Batman winds up on the Prison Planet of Pluto where he meets Robin the Toy Wonder and learns that the 853rd Century Batman is warden. Batman fights new versions of old Arkham villains. After defeating the Laugher Batman reunites with his fellow teammates and the returning JL-A to take on Solaris. Thanks to some trickery in the 21st century, Solaris digs up what he believes is a Kryptonite bullet and fires it at the sun-emerging Superman. However, the bullet has been replaced with a Green Lantern power ring. Instead of killing Superman, Solaris hands him the greatest weapon imaginable, allowing him to easily win the day. The heroes are triumphant. The 21st century heroes return home.

–100 Billion CE
Reference in Flash Vol. 5 #21
. Bruce, trapped in the past thanks to Darkseid’s Omega Sanction, time-leaps from a period right after the death of his parents to 100 Billion CE aka Vanishing Point, the final moments before the literal End of Time—or, in scientific terms, total universal heat destruction that occurs before time loops back around to its beginning. At Vanishing Point, a group of technorganic archivist Bush Robots oversee the final entropic process, cataloging information on a cosmic loom that charts a near infinite number of interweaving chronological pathways, the whole of which comprises a map of every timeline in the omniverse. As thermodynamic collapse draws near, the Bush Robots prepare a black hole that will store the complete—canonical, if you will—archival record of the entire chronological history of Universe-0. Where this black hole winds up for storage and who gets to review it is beyond me, but the questions form an enigma that is startlingly mind-bending and glorious all at once. The Bush Robots heal Bruce and capture the deadly Hyper-Adapter that has been traveling with him. With help from the Bush Robots, Bruce travels with the weakened Hyper-Adapter back to his correct time period. There, the Hyper-Adapter is defeated and sent backward through time in the form of a giant bat, eventually winding up in 38,000 BCE where it is slain by Vandal Savage.