Listed in rough order of importance.
See Main Sequence.
See Main Sequence.
Earth-3 was a "reversed" Earth. The counterparts of the five core members of the Justice League were villains known as the Crime Syndicate, and Lex Luthor was a hero who opposed them. (Other aspects were also reversed - actor Abraham Lincoln shot president John Booth, for example.) The Crime Syndicate originally invaded Earths 1 and 2 out of sheer boredom - they wanted a challenge. Earth-3 was destroyed in the opening pages of Crisis. During the Interregnum two canon references were made to the Crime Syndicate (Justice League Quarterly #8, 1992, and JLA Secret Files #1, 1997); in both instances their "home universe" had been changed to Qward. Luthor of Earth-3 was seen as a Hypertime ghost in Planet Krypton.
Technically, Earth-4 was neither pre-Crisis nor major, since its DC appearances amount to only half-a-dozen issues of Crisis itself before being merged into Earth-Sigma. Nevertheless, it was and is one of the cornerstones of the post-Crisis Main Sequence. In Planet Krypton we see Captain Atom in his original Earth-4 costume.
Earth-S was the home of the wizard Shazam and the hero Captain Marvel. Captain Marvel's debut marks its first appearance. (Note: The "first issue" of Whiz Comics is... well, its complicated. See The Shazam! Archives for details.) DC began publication of Captain Marvel's adventures in the early 1970s, when they revealed that the Marvel Family and their greatest enemies had been trapped in suspended animation since the 1950s. Earth-S became one of the cornerstones of Earth-Sigma during the Crisis. Several characters from Earth-S are seen in Planet Krypton, notably Mr. Atom, and Hoppy the Marvel Bunny is seen in The Kingdom.
Earth-X was the adopted home of Uncle Sam and the other Freedom Fighters, who traveled there from Earth-2 to help a world without heroes against the Nazis. Even with their help, the war was much longer than on most other Earths, and the Nazis were only defeated with the help of the Justice League in the 1970s. Earth-X joined with the other worlds to become Earth-Sigma at the end of the Crisis. At least one possible Earth-X character is seen in Planet Krypton (the Jester).
Originally, DC Comics pretended that superhero comics took place in "the real world". Then, when there was more than one Earth, Earth-1 was "the real world". Eventually, they decided that - since there were no superheroes flitting around outside the DC Comics offices - "the real world" had to be a different world from Earth-1. This world was called Earth-Prime. Several DC characters ended up traveling cross-dimension and having run-ins with their creators. Eventually, Earth-Prime acquired heroes of its own, including Ultraa and a Superboy. Earth-Prime was reported destroyed by Superboy-Prime in Crisis #10. This was probably for the best; Earth-Prime had a major nuclear war in the late 1980s, as revealed in Animal Man #24, 1990. In The Kingdom #2, we see a glimpse of Julius Schwartz and the cosmic treadmill the Flash built while trapped on Earth-Prime.
This is a universe of more than three spatial dimensions, lying adjacent to Earth's universe. It is inhabited by a race of imps who posess science so advanced, it is indistinguishable from magic. There are actually several Fifth Dimensions, at least one for each of the Main Sequence universes. Each is technically "part" of an alternate Earth, and thus one still existed after the Crisis. The Fifth Dimension of Earth-2 is home to Mr. Mxyztplk (note spelling, pronounced "Mix-yiz-tipple-ik"). Earth-1's Fifth Dimension is the place of origin of Mr. Mxyzptlk (pronounced "Mix-yiz-pittle-ik"), and possibly to Bat-Mite. The Fifth Dimension of Earth-Sigma also has a Mr. Mxyzptlk, and is definitely Bat-Mite's home as well. Ditto The Fifth Dimension of Earth-0. The Central Timeline's Fifth Dimension is the origin place of Mxyzptlk, Bat-Mite, and Johnny Thunder's Thunderbolt.
The Fifth Dimension is part of the Central Timeline, and thus not technically a Hypertimeline.
"Qward" is technically only the name of one planet in the anti-matter universe, but the part is sometimes used for the whole. This universe is home to the Thunderers of Qward and the Anti-Monitor. It survived the Crisis, and apparently still exists today.
A world inhabited by intelligent, cartoon-like animals. Several were given superpowers by a strange meteor from Earth-1 and became the Zoo Crew. Earth-C was not destroyed by the Crisis, but never had any contact with the Main Sequence from that point forward, and was rarely seen. Captain Carrot, the major hero of Earth-C, is seen in Hypertime in The Kingdom #2.
Another world inhabited by intelligent, cartoon-like animals. This world is fictional to the residents of Earth-C. (Indeed, the creator of their comic book is a member of the Zoo Crew). It technically survived the Crisis, but has not been seen in years.
This Earth is home to the Inferior Five, the incompetent children of the WW2 superteam called the Freedom Brigade. These heroes were lost in N-dimensional space during the Crisis, and were seen briefly looking for Earth-12. It is assumed that Earth-12 was their home, though definitive proof does not exist. They instead ended up on Earth-Sigma, and their present whereabouts are unknown.
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