WARNING: The following article contains spoilers for Justice League #19 by Scott Snyder, Jorge Jimenez, Alejandro Sanchez and Tom Napolitano, on sale now.
Nothing gets fans going quite like seeing future or alternate versions of their favorite superheroes. You may not want to admit it, but there is a built-in appeal to witnessing not only the changes that have been made to fan-favorite characters, but also pondering what happened that could have caused these changes in the first place.
All these factors are in place in Justice League #19, which sees DC's premier superhero team venture off to the Sixth Dimension, home of Perpetua, the Monitor, Anti-Monitor and World Forger. The Sixth Dimension is the Control Room for the Multiverse, and if the Justice League wants to have any hope of stopping Perpetua from changing the Multiverse back to its original state, they'll need the magical imp, Mxyzptlk, to take them there.
The only problem is the Sixth Dimension is out of the realm of comprehension for even powerful beings like Wonder Woman, Flash and the rest of the Justice League. However, once Mxyzptlk reveals Superman is up to the task (thanks to years of being infused with Fifth-Dimensional energy), the Man of Steel walks through a portal to visit the Sixth Dimension. He quickly returned looking much older and very regal, and convinced the Justice League to travel back with him to observe how he found a way to save the universe.
To the surprise of many, the future of the DC Universe is looking bright, and it's all because of the very familiar, yet drastically different, Justice League of the Future.
Sixth Dimensional Justice League
After the Justice League arrives in the Sixth Dimension, the gray-haired Superman greets them outside the Hall of Justice with his present-day teammates. The sun is shining and white doves are shown flying overhead, to really drive home how the future is looking bright for our heroes, but even so, it's shocking to see how different the team looks compared to their present-day counterparts. Superman did say he's spent the last ten years in the Sixth Dimension, and the changes to the Justice League reflect that.
The roster of the Future Justice League is the same as the group that traveled to the Sixth Dimension, with the addition of a young child who happens to be the offspring of Martian Manhunter and Hawkgirl. The two heroes have become close over the last several issues after they journeyed to the ruins of Thanagar Prime. Their bond obviously grows even deeper, resulting in them forming a relationship and having a child together who has Martian Manhunter's physical appearance with Hawkgirl's wings.