History YMMV / JLAAvengers

* DorkAge: Leave it to Creator/KurtBusiek to make a compelling story point out of these. In the third chapter, the heroes are in a happy [[UsefulNotes/TheSilverAgeOfComicBooks Silver Age]]-style two-earth universe, and once they finally realize that this is just a distraction as the Earths destroy each other, they ask to see the worlds the way they should be. Each character sees the [[FaceHeelTurn Face-Heel Turns]], {{Heroic Sacrifice}}s, {{Suspiciously Similar Substitute}}s, and WithGreatPowerComesGreatInsanity that they will experience in the "correct" universe. They are horrified and initially consider the selfish idea of just leaving the Earths as is. Finally Hal Jordan, who arguably has the most to lose, tells everybody that they don't have the right to play God with the Earths (which, ironically, was the root of his own DorkAge), and the heroes agree to restore everything that was, both good and bad.

* CompleteMonster: [[BigBad Krona]] is a former Oan [[MadScientist scientist]] and [[ItsAllAboutMe callous egomaniac]] who desires to learn the secrets of the universe, and later goes on to destroy countless universes to discover their creation. Arriving in the Marvel Universe, he makes a bet with the Grandmaster, to put the heroes from their universes against each other to collect a dozen cosmic items. When Krona loses, he reacts by fatally torturing the Grandmaster, before summoning ComicBook/{{Galactus}} and killing him in a fit of rage. Using Galactus's corpse as a new base of operations, Krona learns of the sentience of the two worlds--Eternity and Kismet--trapping the two beings together to learn their secrets. When Metron calls out Krona for caring about conquest as opposed to knowledge, Krona eventually admits to this. Hoping to recreate Galactus's origins with himself in his stead, Krona plans on forcing the Marvel and DC Universes together to [[OmnicidalManiac destroy them both]] and start a new Big Bang.

* TheyWastedAPerfectlyGoodPlot: An intentional example, with the various Marvel vs. DC crossovers shown in one panel (like Lobo vs. the Shi'ar Imperial Guard) or only alluded to.
** [[spoiler:Darkseid with the Infinity Gauntlet alone would've had limitless possibilities.]]

* DesignatedHero

* DorkAge: Leave it to Creator/KurtBusiek to make a compelling story point out of these. In the third chapter, the heroes are in a happy [[UsefulNotes/TheSilverAgeOfComicBooks Silver Age]]-style two-earth universe, and once they finally realize that this is just a distraction as the Earths destroy each other, they ask to see the worlds the way they should be. Each character sees the {{Face Heel Turn}}s, {{Heroic Sacrifice}}s, {{Suspiciously Similar Substitute}}s, and WithGreatPowerComesGreatInsanity that they will experience in the "correct" universe. They are horrified and initially consider the selfish idea of just leaving the Earths as is. Finally Hal Jordan, who arguably has the most to lose, tells everybody that they don't have the right to play God with the Earths (which, ironically, was the root of his own DorkAge), and the heroes agree to restore everything that was, both good and bad.

* {{HSQ}}: This whole series is made of these.
** Thor hits Superman with his hammer, Supes ''catches'' it.
** Krona defeats Galactus... And then ''builds a house out of him.''
** The Epic Battle scenes are pretty incredible too, especially for hardcore fans (one panel shows Superman going one-on-one with Count Nefaria)
** Parallax briefly returns, and thankfully, he's not around long enough to do his unique brand of damage.

* {{HSQ}}: Pretty high for a mainstream superhero comic.

* {{Magnificent Bastard}}s: Grandmaster and Metron.

* HilariousInHindsight: And HarsherInHindsight InUniverse -- Hal Jordan says that the JLA and the Avengers shouldn't try to "play God" with their realities and try to make them the ones they ''want''. Cue ''ComicBook/DCRebirth'', when [[spoiler: [[ComicBook/{{Watchmen}} a Godlike character]]]] has been revealed responsible for doing ''just that'' in creating the ''ComicBook/New52''.

* HilariousInHindsight: And HarsherInHindsight InUniverse -- Hal Jordan says that the JLA and the Avengers shouldn't try to "play God" with their realities and try to make them the ones they ''want''. Cue ''ComicBook/DCRebirth'', when [[spoiler: [[ComicBook/{[Watchmen}} a Godlike character]]]] has been revealed responsible for doing ''just that'' in creating the ''ComicBook/New52''.

* HilariousInHindsight: And HarsherInHindsight InUniverse -- Hal Jordan says that the JLA and the Avengers shouldn't try to "play God" with their realities and try to make them the ones they ''want''. Cue ''ComicBook/DCRebirth'', when a Godlike character has been revealed responsible for doing ''just that'' in creating the ''ComicBook/New52''.

* CompleteMonster: [[BigBad Krona]], as in his original incarnation, is a former Oan [[MadScientist scientist]] and [[ItsAllAboutMe callous egomaniac]] who desires to learn the secrets of the universe, and later goes on to destroy countless universes to discover their creation. Arriving in the Marvel Universe, he makes a bet with the Grandmaster, to put the heroes from their universes against each other to collect a dozen cosmic items. When Krona loses, he reacts by fatally torturing the Grandmaster, before summoning ComicBook/{{Galactus}} and killing him in a fit of rage. Using Galactus's corpse as a new base of operations, Krona learns of the sentience of the two worlds--Eternity and Kismet--trapping the two beings together to learn their secrets. When Metron calls out Krona for caring about conquest as opposed to knowledge, Krona eventually admits to this. Hoping to recreate Galactus's origins with himself in his stead, Krona plans on forcing the Marvel and DC Universes together to [[OmnicidalManiac destroy them both]] and start a new Big Bang.

** Superman is a JerkSue for most of the crossover, not TheCape as he's normally written.

* DorkAge: Leave it to Creator/KurtBusiek to make a compelling story point out of these. In the third chapter, the heroes are in a happy SilverAge style two-earth universe, and once they finally realize that this is just a distraction as the Earths destroy each other, they ask to see the worlds the way they should be. Each character sees the {{Face Heel Turn}}s, {{Heroic Sacrifice}}s, {{Suspiciously Similar Substitute}}s, and WithGreatPowerComesGreatInsanity that they will experience in the "correct" universe. They are horrified and initially consider the selfish idea of just leaving the Earths as is. Finally Hal Jordan, who arguably has the most to lose, tells everybody that they don't have the right to play God with the Earths (which, ironically, was the root of his own DorkAge), and the heroes agree to restore everything that was, both good and bad.

* CrackPairing: Eternity and Kismet fall in love over the course of the story. Seriously. They are the living embodiments of the Marvel and DC universes, respectively. Incredibly, their embrace as Krona tortures them and their visible sadness when they are finally separated are actually pretty moving. Note that pairing them with ''anyone else but each other'' would be even more of a CrackPairing.

* OneSceneWonder: The Thing only appears for two pages, but absolutely steals the show by just being his ever-lovin' self, rendering Batman speechless until he leaves. After this the stunned Dark Knight has to admit that Grimm has a "rough-edged charm" all his own.

* FridgeBrilliance
** Prior to the 90s ''DC versus Marvel'' series, all other crossovers between the two companies were written as if the characters had always lived in a shared universe and been aware of the existence of the other company's locations and characters (the MST3KMantra was in full effect). ''Avengers/JLA'' actually provides a possible belated explanation for this, as The Grandmaster's plan does indeed create a shared universe in which Marvel and DC characters are aware of each other and cross over regularly. Due to the nature of retroactive alterations in time, ''Superman vs. Spider-Man'', ''Batman vs. Hulk'', ''Teen Titans vs. X-Men'' and all the other prior crossovers can be seen as taking place in that alternate shared universe.
** There is a pre-existing explanation for these crossovers: The ''Unlimited Access'' mini-series revealed that universes tend to temporarily fuse in "crossovers", not only in the present day but also in the past, so Access must travel in time to ensure the universes re-split after each crossover to prevent them from becoming the ComicBook/AmalgamUniverse again, with everybody forgetting such crossovers after returning to their own universes (this miniseries also included a previous JLA-Avengers crossover between the founder members of both teams).
** The OfficialHandbookOfTheMarvelUniverse has numbered at least one Earth in the Marvel Universe (Earth-7642, to be specific) where the DC characters exist and regularly cross over with Marvel's characters; it's where Marvel canon places all of the crossovers aside from Marvel vs. DC and JLA-Avengers. The latter, at least, is implied to have involved Earth-616, the main Marvel universe.

* CrackPairing: Eternity and Kismet fall in love over the course of the story. Seriously. For those of you who don't know, they are the living embodiments of the Marvel and DC universes, respectively. Incredibly, their embrace as Krona tortures them and their visible sadness when they are finally separated are actually pretty moving. Note that pairing them with ''anyone else but each other'' would be even more of a CrackPairing.

* MagnificentBastard: Turns out both the Grandmaster and Metron [[spoiler: set up Krona's downfall from the beginning.]]

* TearJerker: Barry Allen and Hal Jordan have a quiet chat, discussing their successors, and wishing they could have one last picnic with their friends.
** While perhaps a bit {{Narm}}, watching Spirit's minor FreakOut after seeing what happens to him and Scarlet Witch if reality gets restored to it's proper state.
** Hawkeye and Flash's [[spoiler: apparent]] death by disintegration.

** There is a pre-existing explanation for these crossovers: The ''Unlimited Access'' mini-series revealed that universes tend to temporarily fuse in "crossovers", not only in the present day but also in the past, so Access must travel in time to ensure the universes re-split after each crossover to prevent them from becoming the AmalgamUniverse again, with everybody forgetting such crossovers after returning to their own universes (this miniseries also included a previous JLA-Avengers crossover between the founder members of both teams).