I've been reading through some Marvel Masterworks collections and the one featuring the Sub-Mariner starts with a cross-over with Namor and Daredevil, but, when I started reading the Fantastic Four comic (1961, which starts with their first story, that includes their origin as a flashback), there are a number of references throughout the comic to how unique the Fantastic Four are. It's as if they are in their own universe, without other superheroes present.

When did the major labels start doing crossovers between the universes of different superheroes? (I'm not as interested in independents, mainly Marvel and DC - maybe when I learn more about comics, I'll want to know more.) Until they started doing crossovers, did each superhero essentially exist in their own universe? And when did things change to the point where many superheroes were all in a common universe (like in Justice League)?

And, one last question on the topic: with the different reboots and such, with the major labels, is it pretty much assumed now that all the superheros (within each label) are in the same universe?

  • I wanted to edit in the date for Marvel Masterworks' issue but I'm not sure if you meant this one or this one? I've read neither, to be honest. But might give it a try sometime!
    – Jenayah
    Commented Sep 30, 2018 at 11:19
  • @Jenayah: The second one. Thank you for checking.
    – Tango
    Commented Oct 1, 2018 at 2:40

2 Answers 2


The first crossover of characters in Marvel comics occurred in Marvel Mystery Comics #8 with the publication date of June 1940 (note most comic covers were dated three months ahead to keep them on the stands longer so this probably came out in March or April.) Here's the cover:

cover of Marvel Mystery comics #8

The story featured a fight between the Sub-Mariner and the original Human Torch. Namor was attempting to avenge himself on mankind for trying to electrocute him, but the Torch showed up and droves him away. The second half of the story has the Chief of Police calling the Torch a coward for failing to bring in the Sub-Mariner. This leads to another confrontation between the two later on. The story continued in the next two issues with the Sub-Mariner capturing the Human Torch in an airless glass tube in issue #9 and in issue #10 the Torch is rescued by his girlfriend.

DC followed suit a few months later with the publication of All-Star Comics #3 with the publishing date of Winter 1940-41. The story introduced the first superhero team with the Justice Society of America, as seen here:

All-Star Comics #3

Their first gathering however was a bit less than one would expect. The members sat around and told stories about their own solo adventures. In the following issue they did have an adventure together.

  • 2
    "The members sat around and told stories about their own solo adventures." Oh my god. THIS is the movie DC needs today to top The Avengers! Commented Jan 25, 2013 at 15:20

The first time DC and Marvel ever crossed the threshold between Universes was the giant-sized comic Superman vs The Amazing Spiderman published in 1976. This giant-sized monstrosity (which I remember buying as if it were the Holy Grail) was the first such official sanctioned crossing of the two mainstream continuities. Yes, it was a completely ridiculous farce where Superman and Spiderman engage in superheroic combat (with Spiderman being enhanced by Red Sun radiation, so he could bring the pain to Superman). My favorite scene is when Superman pulls his punch, stopping millimeters from Spiderman's face, as the radiation which was giving Spidey an edge wears off and Spiderman is blown backward down the street and through a building by the wind shear of Superman's punch. Great fun. The villains of course are Lex Luthor and Doctor Octopus.

Superman vs the Amazing Spiderman 1970

Marvel's heroes for the most part existed within their same universe, but were not known to cross into each other's stories except for books like Marvel Team-up or other such books designed to showcase two heroes who might not otherwise meet to work together. Quality of such stories varied (but I did love them just the same). The Marvel Universe was very segmented early on, but once Marvel discovered how much readers enjoyed team-ups and crossovers, you could expect at least one a year, usually in the Avengers, whose lineup at one point boasted over fifty members.

Marvel did have one opportunity to create alternatives to their characters using the What If storylines. What If was a book designed to take pivotal storylines and posit an alternative ending to them. These were very popular and eventually lead to the Marvel version of the Multiverse where Marvel worlds were slowly given numerical designations so writers could keep up with what happened in that alternative timeline. The mainstream Marvel Universe is number 616.

DC on the other hand had a much more difficult time with its alternative universes (called the DC Multiverse). No, I don't plan to go into the horror that is the early DC Universe, enjoy the Wikipedia link for the whole sorted tale. Early in their publishing career, they bought up many smaller concerns and had to deal with their separate worlds. The Shazam Family was one such purchase. It stayed separated from the mainstream DC universe (back then the mainstream universe was called Earth 1). The Shazam Family lived on Earth S and had little interaction with the Earth 1 continuity. When DC decided to migrate away from what were considered the Golden Age Heroes (the first versions of Superman, Kal-L, Batman, Green Lantern (Alan Scott) and the Flash (Jay Garrick) to more modern (scientific) versions of the characters, the Golden Agers were relegated to the universe called Earth 2.

The Flash of two worlds cover

As readers, we are only privy to the transformation during a comic called The Flash of Two Worlds, where we are informed that there are two continuums in place. The modern world of comics, called the Silver Age in the 1960s and an earlier world where its around 1950 with the earlier versions of all our favorite DC heroes. Many are famous, some were not, but their most famous iteration was the Justice Society, from which the idea of the Justice League was based.

This continuity crossover was so popular it became a yearly event in the DCU between the Justice Society and the Justice League and DC would experiment with many of their parallel worlds and products during this time. This unfortunately would lead to the Crisis on Infinite Earths, where DC would try to bring all of their products together on a single world in a single timeline with a cataclysmic event that collapsed all of the known Earth continuities together onto a single world. This ended badly.

There were several attempts to clean this up over the next two decades resulting in the latest iteration of the DCnU called the New 52. This collection of 52 universes is now the reality of the DCnU. It is assumed any stories that are wanted can be made or told somewhere within those 52 universes and those tales will be considered canon. Room to experiment and the opportunity to reboot the DCnU one more time, resetting all clocks, erasing all unwanted characters (mistakes, continuity glitches, retcons and story problems such as the Legion of Superheroes which suffered terribly under all of the Universe resets) and recreating the DCU hopefully for the last time. But we know better.

This is not to say there have not been successful alternative universe projects, particular with DC. Two of their best known graphic novel collections are from an alternative universe, Kingdom Come, a dystopian future where superheroes become the rulers of a frightened populace, and Red Sun, a world where Superman is raised in the Soviet Union and becomes a weapon of the state. Marvel's Days of Future Past spawned dozens of related continuities and alternative versions of heroes, and the Age of Apocalypse where an entire timeline became temporarily, the mainstream reality for a time, and can still affect the mainstream universe. It has remained its own timeline Universe #295.

In the end, Marvel still kept its Multiverse of numerically assigned worlds with two of them being considered the primary real estate of the MU. There is Universe 616 known as the Mainstream Universe. All stories told unless otherwise informed, are taking place in that universe and with all of its attendant realms (Asgard, the Negative zone and other such places) and the Ultimate Marvel Universe (a more modern reboot of the Marvel Universe, from which the Marvel Universe movies are based) numbered 1610. There are many other timelines in the Marvel Universe, for a list you can consult Wikipedia's Multiverse entry for the Marvel Universe.

DC has collapsed their entire Multiverse into a single hyperconnected continuum of universes, 52 to be exact, but we have seen very little of any of the other universes besides the primary DCnU. Rumor has posited we will be seeing an alternative world featuring a differently dressed Power Girl and Huntress team, and a Black Superman.

The only thing you can be sure of with comics and their mutable universe structures is there will be things that the writers/editors won't like and when enough of them happen, there will be rectons (rewriting of the comic universe so events did not happen) or movements of those moments to other parallel worlds where the idea can be experimented with.

DCNU Earth 2 Black Superman

  • "Flash of Two Worlds" was published in 1961. Not the 70s. Just saying.
    – Legion600
    Commented Feb 25, 2012 at 1:20
  • You're right. I forgot to include my own age into my permutations. I was writing from memory. Made the corrections. Thanks. Commented Feb 25, 2012 at 1:55
  • A lot of good information -- unfortunately, the other answer had one from 1940, even earlier. It's clear you have a fascination for comic books -- I'm picking up one now as I start reading some for the comics grant. Cool stuff!
    – Tango
    Commented Feb 28, 2012 at 20:38
  • 3
    I was assuming you meant between the two major comic universes, not necessarily within the single comic companies themselves. My mistake. Commented Feb 28, 2012 at 22:39

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