In Pre-Crisis comic books, superheroes and their secret identities are often considered alter egos.

Earth-One ( also Earth-1 ) is a name given to two fictional universes ( The Pre-Crisis and Post-Crisis versions of the same universe ) that have appeared in American comic book stories published by DC Comics.

* Superman is real, Clark Kent the mask: Pre-Crisis interpretations of Superman assumed that Clark Kent was the " mask " and Kal-El the person ( in the classic story Superman: Whatever Happened to the Man of Tomorrow ?, when Superman's dual life is revealed, he completely abandons his Clark Kent persona ).

* Clark Kent is real, Superman the mask: With John Byrne's more assertive revamp of Clark Kent as well as Superman's greater grounding in Earth culture and humanity ( as opposed to the everpresent Kryptonian heritage of the Pre-Crisis version ), Superman is considered the " mask " and Clark the person.

Although Kent is described in the show introduction as " mild-mannered ", he can be very assertive, often giving orders to people and taking authoritative command of situations, though, as in the Pre-Crisis Superman stories at that time, Clark is still considered the secret identity.

In this early Post-Crisis storyline, Superman found himself in this pocket universe in which, similar to the Pre-Crisis Earth Prime of Superboy-Prime, his teenage counterpart was the only superhuman on Earth.

Red Son Superman is also extremely powerful, as was the Pre-Crisis Superman, and wields a number of super-abilities including such mainstays as super strength, hearing, and sight, flight, and heat vision.

The events of the Infinite Crisis miniseries have restored a close analogue of the Pre-Crisis Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis on Infinite Earths Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

An additional incarnation of the Pre-Crisis Earth-Three Ultraman has made appearances most recently in Infinite Crisis where Alexander Luthor, Jr. wanted to create so-called " perfect beings " out of his models of long-dead father Alexander Luthor, Sr., the lone super-hero of Earth-Three, Superman ( both of Earth-One and Earth-Two ), Wonder Woman ( of Earth-One and Two ) and the Earth-Three Ultraman and Superwoman.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis on Infinite Earths Legion of Super-Heroes to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis mini-series have apparently restored a close analogue of the Pre-Crisis Legion continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis on Infinite Earths Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis on Infinite Earths Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have restored a close analogue of the Pre-Crisis Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

The events of the Infinite Crisis miniseries have apparently restored a close analogue of the Pre-Crisis on Infinite Earths Legion to continuity, as seen in " The Lightning Saga " story arc in Justice League of America and Justice Society of America, and in the " Superman and the Legion of Super-Heroes " story arc in Action Comics.

Her claws are magically enhanced and have drawn blood from individuals who are considered highly durable like Geo-Force, Despero and Pre-Crisis Superman.

In Hoppy's first appearance in DC Comics ( in DC Comics Presents # 34 ), Hoppy and Millie find themselves magically transported to Earth-S, the home of the Marvel Family in the Pre-Crisis DC Universe.

In Pre-Crisis continuity, Lex grew up in Smallville alongside Clark Kent, and subsequent continuity retcons ( in Birthright and further changes post-Action Comics # 850 ) have reintroduced new variations of the Smallville origin to the modern Luthor, largely to create greater similarity with the TV show Smallville.

Unlike the Pre-Crisis version, Lena is well-aware of history with Lex, having grown up alongside him, with only an abusive father.

The Pre-Crisis Luthor also has a niece named Nasthalia Luthor who is an occasional thorn in Supergirl's side.

* Comet the Super-Horse – Pre-Crisis Supergirl's horse is a centaur accidentally cursed by Circe into being trapped in the form of a horse.

* Dick Malverne – An orphan at the Midvale Orphanage who is one of Pre-Crisis Supergirl's romantic interests.

Pre-Crisis, he is Army Sergeant Ben Krullen, who served with Tempest and developed his powers because of the hero.

There is an equivalent of Earth-C in the newly reestablished DC Multiverse, designated " Earth-26 ", with a history and population similar to that of the Pre-Crisis Earth-C.

Barbara " Babs " Gordon is the biological daughter of James Gordon in Pre-Crisis continuity.

Pre-Crisis, it is revealed she cannot call on her power for 24 hours every 1, 000 years, as Shazam loses his powers during that time ( although he is still able to send his spirit to contact her ), and therefore so must she.

Although she's retained the " soothing " effect of her powers from her Pre-Crisis incarnation, she is unable to probe shielded minds, and must concentrate to exert direct influence on an opponent's brain ( such as disrupting an opponent's amygdala ).

Night Girl is included in their number ( although she was never a member of the Pre-Crisis Legion ).

Dawnstar is shown with this Pre-Crisis Legion in the limited series Final Crisis: Legion of 3 Worlds.

Thanks to the time-traveling efforts of Bizarro in Superman / Batman # 24, Cir-El is able to join Linda Danvers, Kara Zor-El ( both Modern Age and Pre-Crisis versions ) and Power Girl to rescue Superman from the Source Wall.

He is much more benign ( and closer to the later Pre-Crisis version ).

This version is based on the Pre-Crisis version of Firefly.

( Pre-Crisis it is a dimensional Solar System ).

These traits extended into Clark's wardrobe, which typically consists of a bland-colored business suit, a red necktie, black-rimmed glasses ( which in Pre-Crisis stories had lenses of Kryptonian material that would not be damaged when he fired his heat vision through them ), combed-back hair, and occasionally a fedora.

He has mastered seemingly every known form of science, including space travel, extra-dimensional travel, biochemistry, robotics, computers, synthetic polymers, communications, mutations, transportation, holography, energy generation, spectral analysis, and more ( including time travel in many Pre-Crisis stories ).

Simply, Pre-Crisis stories were not as stringently policed or edited, and often contained errors and internal inaccuracies ( in large part because of their frequent nature as one-shot stories, rather than linked tales designed to follow evolving and changing characters ).

Pre-Crisis stories are often seen as throwaway and frivolous, perceived to be dominated by imaginary tales and " camp " characterisation.