The Silver Age introduced the concept of the Multiverse, which has defined DC Comics. The fifty-two Earths that comprise the current Multiverse is a mostly underused sandbox of possibilities. Occasionally there are brief cameos by characters from the other Earths, but for the most part, all in-continuity stories take place on New Earth (Earth-0).
The recent Freedom Fighters series showcases Earth-X and proves that exciting stories about other Earths in the Multiverse are possible and can be told if creators are given the opportunity. The following 5 Earths are perfect for similar treatment, while there are five that are overrated:
10 Should Get A Limited Series: Captain Carrot And His Amazing Zoo Crew of Earth-26
Anthropomorphic superheroes! Cartoon physics allowing the heroes to survive almost anything! These are the defining characteristics of Earth-26, the home of Captain Carrot and His Amazing Zoo Crew. After a Pre-Crisis on Infinite Earths ongoing series in the early 80s, the heroes of Earth-26 were relegated to sporadic appearances in the DCU. Captain Carrot, the Superman analog, reappeared as part of Justice Incarnate and in the current Young Justice series.
Earth-26 would make a perfect addition to the already stellar line of titles under the Wonder Comics banner as creators would have the freedom to explore cartoon physics that governs this Earth. At the same time, tell a compelling and exciting story if handled correctly.
9 Shouldn't Get A Limited Series: The Earth-2 Society Of Earth-2
The New 52 relaunch was DC Comics' attempt to make their characters more relatable, which included the classic Golden Age characters who originally lived on Earth-2. On the new Earth-2, the deaths of Superman, Batman, and Wonder Woman inspire a new generation of "Wonders" to take up the fight of the original heroes.
A huge fan backlash met this attempt to modernize the Golden Age heroes, and the second series featuring these characters ended in 2017. The final issue of Earth-2 Society left the heroes on a new Earth-2, and these characters have not appeared since that time, which is probably for the best since the original Justice Society is set to return to the DCU. Any attempt to use the heroes from the new Earth-2 would not be in the company's best interest at this time. In other words, the Earth-2 Society should stay in comic limbo…forever.
8 Should Get A Limited Series: Earth-42 The Chibi Earth
Earth-42 is home to the tiny inhabitants who knew nothing of concepts such as mortality, evil, and violence until SuperDoomsday (of Earth-45), killed their Superman. This Earth "hides a terrible secret," which is hinted at when Earth-42 Batman discovers he is a robot, and the other heroes are resurrected by "The Empty Hand" who tells them that they have died before and will again. These beats would provide the perfect jumping-off point for a limited series.
7 Shouldn't Get A Limited Series: Earth-6 Stan Lee's Just Imagine
Earth-6 is home to a cosmic cop and Kryptonian castaway Superman, the Green Lantern who receives his power from the World Tree Yggdrasil, a Wonder Woman who wields Manco Capac, a staff of celestial power, and the Batman, a regular human who dons the guise of a terrifying bat - wings and all. The central theme of this Earth is that one that should embrace new and different ideas; and to not fear them, as strength lies in the idea that different perspectives can bring new life to old ideas.
These Just Imagine heroes were the result of Stan Lee bringing his take to the DC Universe through a series of one-shots in the early 2000s. Lee's takes on the characters where mostly misses, as the concept was interesting, but lost something in the execution. While giving these characters, their own Earth was a subtle nod to Stan Lee; it doesn't need to be revisited.
6 Should Get A Limited Series: Earth-8 DC's Marvel Universe
Earth-8 is the home to heroes such as the patriotic super-soldier American Crusader, Wundajin, a warrior god who controls and is charged by lightning, Behemoth, the massive monster controlled by his anger, and the elementally-powered, yet science-based Future Family. These heroes, along with others, battle to keep their world safe from such threats as Lord Havok and the Extremists even though on this Earth, the pursuit of heroism often comes at the cost of great personal sacrifice.
Earth-8 has been the focus of past limited series but focused on the villains, mainly Lord Havok and his Extremists, not the heroes. DC did not attempt to hide the fact that analogs of the Marvel Universe inhabit this Earth. The events of the Rebirth Era Justice League of America storyline, where Earth-8 is seemingly reborn, would be the perfect starting point for the story.
5 Shouldn't Get A Limited Series: Earth-9 Tangent Universe
Earth-9 is inhabited and influenced by the super-powered heroes, and villains control the politics and economy around them. On this Earth, Superman is a being of vast mental powers and intelligence, Batman is a lost in time spirit that is trapped in a suit of armor, and The Joker is a freedom-loving anarchist.
DC's Tangent Comics from the late 90s introduced these characters. They have made occasional cameo appearances, such as The Green Lantern, who has the power to resurrect the dead, recently appearing in Grant Morrison's The Green Lantern. Like the Just Imagine characters, the Tangent heroes at the time of their creation was a novel and interesting concept which just never caught on with readers.
4 Should Get A Limited Series: Earth-19 Steampunk/Post-Victorian Era
Earth-19 is the steampunk, post-Victorian era Earth where the industrial revolution meets the arrival of superheroes such as Bat-Man, Accelerated Man, The Wonder Woman, The Shrinking Man, and others who stand ready to protect their Modernist world and its values, even though King Edward still sits on the throne and controls the empire.
This Earth would make the perfect setting for a limited series as it was the setting in which the first Elseworlds story, Gotham By Gaslight. The only thing that would make things complicated is the fact that this Earth was "destroyed" as part of Perpetua's plan to tip the Multiverse towards evil.
3 Shouldn't Get A Limited Series: Earth-21 Final Frontier
Earth-21 is home to the versions of the DC heroes that were featured in the seminal New Frontier miniseries by the late Darwyn Cooke. Before it was designated as its own separate Earth, the New Frontier took place Pre-Crisis on Infinite Earths but used a post-Crisis continuity where the Golden and Silver Age characters shared the same Earth and a single timeline to tell the story.
The New Frontier Earth was later revisited in 2008s Justice League New Frontier Special as a tie-in to the animated movie release. Following Cooke's untimely death in 2016, the New Frontier continuity was designated as Earth-21 during the Multiversity event. The New Frontier was a groundbreaking story, and there was no better way to honor Darwyn Cooke than giving his timeless tales and characters their own Earth in the Multiverse and making future stories in this continuity off-limits to other creators.
2 Should Get A Limited Series: Unknown Earth
According to the Multiversity Guidebook, seven "unknown" Earths were created by the Inner Chamber of Monitor Magi for an unknown and yet to be explained purpose. A series based on one of these unknown Earths would be the perfect opportunity to begin the reveal of the purpose these Earths serve and who the superheroes who live there.
1 Shouldn't Get A Limited Series: Earth-22 Kingdom
Earth-22 is home to the Kingdom Come continuity where Superman retired after the next generation of heroes adopted a more ruthless approach to fighting crime and disregard for civilians. It was only after the destruction of Kansas that Superman would return to the spotlight and bring society back from the edge of apocalypse as the old guard was forced to deal with the consequences of their lack of action.
Kingdom Come was revisited in 1999's sequel The Kingdom and again in 2011 in Justice Society of America. The Kingdom Come Earth/continuity is one of those story's that feels like it has been told, and while there are probably stories that could be told, it feels like it would be a repeat of the original.