To explain discrepancies in the aging of Superman across several decades, his earliest stories were retroactively portrayed as having taken place on an alternative world called Earth-Two.

Clark eventually marries Lois Lane[2] and settles down with her for several decades, and when Kal-L's long-lost cousin Power Girl arrives on Earth, they become her surrogate parents.

The Silver Age Superman was typically characterized as being more grounded in reality than previous depictions, in that he was portrayed with a realistic appearance and embedded within logical and rationalistic narratives.

[10] While these were still based on the science fiction of his earlier iterations, Superman was portrayed in storylines that sought to uncover the mysteries of the world through observation and the use of evidence, including the concept of limits and the consequences of human action.

Krypton was also reimagined as an emotionless and sterile society where all their babies were grown in a birthing matrix as Kryptonians found sexual reproduction to be barbaric.

Clark also spends some years traveling the globe trying to find himself after leaving Smallville and before settling in Metropolis, performing various low-key rescues before a crashing plane forces him to make a more public debut.

He struggles with vulnerability for the first time while fighting crime in an improvised way, while also dealing with not being taken as seriously, problems in his relationship with Wonder Woman that eventually cause him to end it, and regaining his powers.

However, a combination of different trials, such as exposing himself to kryptonite to purge himself of the radiation inhibiting his powers and absorbing energy from the fire pits of Apokolips, compromise his health.

Following DC's Flashpoint event, The New 52 Earth-1 is the setting of the Earth One graphic novel series, where Superman is one of a handful of heroes just starting out in modernized retellings of classic origin stories.

Due to an experiment conducted on an entire town by a government black ops group called Nightwing, Harvey Dent was the lone infant survivor of a failed super-human program that killed hundreds.

After growing to adulthood, and falling from the world's tallest building in an attempt to save a suicidal man, his dormant powers activate and he develops advanced physical and psychic abilities.

Overman leads the New Reichsmen, his world's Justice League, consisting of Brunhilde, Leatherwing, Blitzen, the Martian Manhunter, Underwaterman, while fighting Uncle Sam and the Freedom Fighters.

The Kingdom Come Superman is more powerful and less vulnerable to kryptonite than his younger mainstream counterpart, due to far greater exposure to yellow sun radiation (as explained by his Earth's Lex Luthor in the miniseries).

He travels to the mainstream continuity in Justice Society: Thy Kingdom Come, and, after returning to his home universe, lives to see the formation of the Legion of Super-heroes in the 31st century.

The 1980s series Captain Carrot and His Amazing Zoo Crew presented the parallel Earths of Earth-C and Earth-C-Minus, worlds populated by talking animal superheroes.

[34] In The Dark Knight Returns and its sequel, Superman is a pawn of the American government in a dystopian United States in the supposed 1980s, and mention of him by the media is implied to be strictly forbidden by the Federal Communications Division.

[35] On the world of JSA: The Liberty Files, on the pre-Flashpoint Earth-40, the Superman was Zod, a sociopath banished to the Phantom Zone for creating a deadly synthetic plague when he was eleven.

Majestros is an alien warlord from the planet Khera who crashed his ship on Earth thousands of years ago while at war with the Kherans' longtime enemies, the Daemonites.

Icon is an alien named Arnus from the planet Terminus who crashes his lifepod in the southern United States in 1839, and is found by an African American slave woman.

He attempts to make his final adventures as meaningful as possible, revealing his identity to his universe's Lois Lane, aiding the scientist Leo Quintum, and inspiring the Superman Squad of the future.

After a final confrontation with Lex Luthor, who had orchestrated Superman's solar overexposure, Kal-El flies into the sun in order to construct it an artificial heart.

At the story's conclusion, after a conversation with police detective 'John Jones' about his possible future, Dale goes into hiding as 'Clark Kent', taking journalism classes to find a normal life after publicly proclaiming that he is leaving Earth to investigate his true history and donating his fortune to a charitable foundation.

He sees his foster parents murdered in front of him and grows up to be a superpowered Batman, but decides to change tactics after a confrontation with the Joker (in this reality an insane Lex Luthor) and a conversation with Lois about the need for him to inspire rather than intimidate.

Eventually he turns to evil after a battle between himself and several of Superman's enemies results in the deaths of Matrix, Brainiac and over 300 innocent people which causes widespread persecution of clones.

In the alternative timeline of the Flashpoint event, Kal-El's rocket crashed directly into Metropolis, resulting in the deaths of over thirty-five thousand people, and the infant was subsequently taken into government captivity to control his powers for uses to make supersoldiers.

After some hesitation, he decides to enjoy himself and meets Oliver Queen, Sue Dearbon, Vic Zsasz and Barbara Ann Minerva, with whom he has a romantic fling.

After a unknown amount of time, Clark has started to wear the traditional Superman costume and is slowly entering a relationship with Lois, though it is not serious, and is visited by Pete and Kenny.

While talking about Batman, Kenny and Pete suggests he tries to contact the other people like him (such as the red blur in Central City, a woman with a lasso in DC, and a fish guy who sinks whaling boats).

This leads Clark to admit that he is hoping that any videos of him saving people with the symbol from his ship on his costume will be sent into space, and whoever left him on Earth would come back.

When Clark attempts to turn the argument around by saying Pete is jealous, his friend points out that he is changing the world by accident and needs to stop waiting around and really do something, and that he is letting down his real parents who raised him.