




Two time tyrants discovered these core principals in their native realms and more than once manipulated these quirks in physics to their own amoral agendas. These villains were T.O. Morrow of Earth-One, and Per Degaton of Earth-Two, and both men were persistent foes of the Justice League and Justice Society, respectively.
Per Degaon hatched the third of this history-altering schemes when he recruited the Crime Syndicate of Earth-Three to accompany him to Earth-Prime, where the rogues stole nuclear weapons from Cuba. Bringing them back to Earth-Two in 1942, Degaton sought to blackmail the world into accepting his authoritarian rule, which in one future timeline was successful until the early 1980s. However, the Justice League of Earth-One travelled back to that era and teamed up with the All-Star Squadron to oppose him, and soon found their friends from the future appear in the skies above one of Degaton's nuclear detonation demonstrations at sea. These were the 1980 versions of 1940s Justice Society members Green Lantern, Starman and Doctor Fate... along with superheroines Power Girl and Huntress. The three male Society members were the chronal counterparts of Morrow's initial two Green Lanterns and himself (while the 1980s Power Girl, who also existed in the 1940s, was the chronal counterpart of Supergirl's Satan Girl/Nightflame clone from the 1970s).
The third of Morrow's Green Lantern temporal twins had a counterpart in the Conqueror's synthetic Green Lantern, which he used against the original and his Justice Society allies. Years later, T.O. developed chronal clones of Steve Trevor, Mera, Hawkgirl, Jean Loring and a girl name Midge... in order the ensnare Wonder Woman, Aquaman, Hawkman, Atom and Snapper Carr into accepting their paralyzing kisses. Once they accomplished their evil deeds for their master, these being like the lethal Lantern trio faded from existence.
During Per's previous time traveling case, he brought back to 1941 future versions of Wotan, Professor Zobar Zodiak, Sky Pirate, King Bee and the Monster (as well as Solomon Grundy, whose Earth-One counterpart was the artificial Grundy clone created by the Parasite in his war against Superman). These chronal clones existed during the same time period as their earlier version, who were unaware that their future selves were engaged in battle with the All-Star Squadron. This scheme, as with all of Degaton's schemes, failed miserably.
Years later, T.O. Morrow reappeared and disgarded the use of chornal clones, and once more manufactured Red Tornado androids modeled after the original, who turned against his master and joined the Justice Society (and later the Justice League). These Tornado androids were made of the same temporal technology as the living chrononal clones, but unlike these being they were made of silicon chips and hardware.




In 1965, Hal Jordan in his Green Lantern alter ego adopted the means to transport himself from his native Earth-One into that of Earth-Two, using cyclical forces similar to those first discovered by his teammate Barry "Flash" Allen. Sometime in 1968, the elemental force from the planet Rann-One known as the Tornado Champion similarly utilized this technique to travel to Earth-Two. Merging its cyclical body with the android body of the Red Tornado, this combined being joined the Justice Society, the heir to the original Red Tornado aka Ma Hunkle.
Still later, he was used as a pawn by Creator2 to draw Earth-Two of his universe together with Earth-One... with the goal of destroying the merged planet which he intended to reshape into a new world. Although this failed, it became readily evident that these vibrational-shifts could do more than move an object or entity between universes... it could have potentially devastating consequences.Years later, when the criminal Iron Hand spawned his world-encircling hand construct composed of Nebuloid-energy, it was only thanks to the intervention of the Red Tornado with a Nebula Rod which destroyed this threat to Earth-Two. However, the Nebuloid energy seemed to counteract vibratory powers, as Red Tornado was now unable to return to his android body's home universe. Instead, he was now tied to his cyclical body's native universe of Earth-One, which he was thrown into following the Nebula Hand's destruction. Despite his desperate attempts to return to Earth-Two, until the Crisis on Infinite Earths, Red Tornado remained on Earth-One.
In the subsequent years following the Flash of two Earths, Barry Allen and Jay Garrick ... and later Green Lantern and Red Tornado's... journeys to each other's universes, more would follow. In addition to dozens of crossovers on both Earths by the Justice League and Justice Society, their enemies would venture into the parallel planet of their homeworld seeking to succeed in their sinister schemes. And others would later permanently trade places, migrating to the other Earth: These included:
Although the more notable portions of their costumed careers were as antagonists and then allies of a pair of Gotham City caped crusaders, Duela Dent and Molly Maynne also infiltrated illegal gangs in order to bring them down from the inside. While Maynne did this initially as a reluctant member of the Injustice Society, in order to save the life of her arch-foe and true love, she years later did this in an official capacity. As for Dent, she ended up joining the Teen Titans in order to defeat various supervillains whom they faced.
Following the dissolution of Earth-One's Titans, Duela abandoned her alter ego as Harlequin (and alternatively, as Joker's Daughter) when she was recruited into the criminal organization known as M.A.Z.E. Conceiving the identity of the Card Queen, Dent used a variety of card-themed gadgets which she initially used against her former teammate Robin, then later used against M.A.Z.E. agents themselves when she and Robin defeated them.





Jordan's initially power battery was bequeathed him by his predecessor, the alien Abin Sur, when that Green Lantern crash-landed on Earth-One having sustained fatal injuries. Hal would daily recharge his power ring by touching it the battery. Scott likewise followed this same pattern on Earth-Two with his own ring and battery, given to him by his predecessor the monk Volthoom.
However, while clashing with his foe the Crumbler, the villain's power glove adversely effected Hal's battery, causing it to be unstable. While away from his homeworld on a mission to planet Oa, home of the Guardians of the Universe who originated both mens' power, Hal's backup Green Lantern named Guy Gardner was shunted into the Phantom Zone while charging his ring on the unstable lantern. The Guardians gave Hal a replacement battery, directing him to destroy the original. Jordan rescued Gardner, whose mind was damaged as a result of the battery's blast.
As for Scott, while his battery remained undamaged, an emerald globe constructed by the designer of the original battery Chang remained in the lampmaker's possession. However, seeking to access the emerald energies to empower his Green Dragon Tong, Chang lured the supervillain Psycho-Pirate into seemingly stealing it from the old man. While it was soon after accidentally destroyed by the Pirate's henchmen, the globe's radiation later empowered the criminal into mentally dominating Scott. This unlocked the power from the battery, allowing Chang to gain abilities on par with Green Lantern himself. That is, until he perished when he failed to realize that its energy had a weakness, wood which through a falling tree ended Chang's life.
After tackling the robot using android duplicates of the heroes, Green Lantern along with fellow members the Flash and the Atom as well as honorary associate Zatanna traveled to the origin point of their automaton aggressor. Initially the Leaguers found stiff opposition with the Champion’s evasive super-speedster, a bad-tempered bald-man, an avian winged warrior, and a caped yellow-and-red garbed matter-manipulating maiden. The two teams eventually mended the rift between them, and combined to defeat their mutual foe.
In 1968, an evil entity traveled to Earth-Two and empowered a youth with vast abilities, in order to destroy that world. This being previously invaded the Cam-Lam-Lo of that universe, that like its counterpart planet was racked with war from opposing sides spawning vehicles and weapons of destruction. In order to combat this threat, the Justice Society member known as the Spectre confronted a make-shift team including an evasive swift-stripling, a bad-tempered bald-man, an aircraft winged warrior, and a caped yellow-and-free Roman gladiator.
Along with his duplicate, the Spectre was able to subdue the trifecta of terror, preventing his world from having the same eventuality as Cam-Lam-Lo itself. The lad Hamilton Benedict returned to normal, his sinister puppeteer faded from existence, and the gladiator himself vanished back to whence he came.

In fact, Charlie was assigned sector 3319, although he eventually returned to his homeworld. The renegade Green Lantern known as Sinestro had been given stewartship over sector 1417. Tragically, the Green Lantern of sector 2813 Tomar-Re was unable to save a prominent world there, Krypton-One, from exploding due to internal pressures whose origin was a mystery for years. These are but a few examples, as several other sectors have been identified progressively over the years, made more widely known by their Green Lanterns interactions with Hal Jordan over time.
On a parallel dimensional plane, the Guardians released a portion of their energy into that other universe, spawning the Starheart. For a time it would be alone, as a sentient star. Eventually, it would find fellowship in similar cosmically imbued sentient beings within stellar bodies throughout their universe’s numerous galaxies.
Kal-L, aka the Superman now of Earth-Two, likewise encountered twin Kryptonite powered green suns orbiting Colu-Two. Utlizing his universe's Sun-Thrivers technology to create them, the immortal villain Vandal Savage used these green suns to siphon off energy from Superman and Power Girl. When he failed and escaped capture with help from mystery beings (probably Savage’s allies the Sun-Thrivers) the twin suns remained.
Throughout the centuries since its creation in the 6th century, the Sun-Thriver within one of these two Kryptonite suns turned insane. Known as Aquarius, now a member with other sentient suns of the self-titled Council of Living Stars, it was stripped of power and banned for its insidious actions. After briefly regaining power through Starman's Cosmic Rod before being defeated by the Supermen and their allies in the Justice League and Justice Society, Aquarius was no more.
The remaining members of the Council of Living Stars, each inhabited by a Sun-Thriver and imbued with power like that of the Starheart, took a more active role in policing their reality than had their counterparts. They assumed the role of intergalactic protectors for sections of their universe... as had the Green Lantern Corps!
The first indication of life on the moon was in the summer of 1942, when Superman and Wonder Woman of Earth-Two ventured there in order to resolve a conflict between them regarding whether America had the right to control the destructive power of the atom. Before battling one another, the pair of Justice Society members noticed grand architecture left behind by a mysterious people no longer present. Then a year later, while battling the 30th century villain Rajak, Green Lantern and his pal Doiby Dickles followed him to the moon. There, the peaceful Selenites King Shel-Don welcomed the visiting terrans to his underground city... and were later attacked by the rival Core-Men who opposed the Selenites. By vaniquishing Shel-Don's foe, the King gave Lantern the Moon Stone, although Raakj temporarily stole it. Later, Green Lantern and Doiby were pulled back to the moon during an eclipse, and met a different faction of Selenites who were former Atlanteans!
On Earth-One, Superman first encountered the Lunarians when natural disasters plagued the globe, originating from the moon. Kidnapped by agents of their Queen, Primor Trena, Superman was intended to be her King after he was led into battle with the current King. Meanwhile, all superheroes on Earth temporarily forgot about their costumed alter egos, leaving Earth-One unprotected. Superman was able to convince the Lunarians to leave the moon for an artificial planet he created rather than take over Earth.