[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/JLA_Avengers.jpg]]
[[caption-width-right:250: Big Damn Heroes personified.]]

''JLA/Avengers'' (or ''Avengers/JLA'' -- both titles were used) is a four-part comic book {{miniseries}} co-produced by the Creator/DCComics and Creator/MarvelComics companies (each published two issues) in 2003-2004. It features a CrisisCrossover between the companies' top superhero teams, ComicBook/TheAvengers and the Franchise/JusticeLeagueOfAmerica. The crossover has an interesting story both within the comics and without.

Originally, the crossover -- which would have pitted the teams against their respective enemies Kang the Conqueror and the Lord of Time -- was meant to come out in the early 1980s; noted artist George Perez, who had worked on both team's titles, was set to draw it. But some behind-the-scenes conflict (allegedly, Marvel's then Editor-in-Chief, Creator/JimShooter, pointed out some story errors -- such as the hero {{Quicksilver}} being as fast as TheFlash -- and asked for a rewrite, which was not well-received by the DC people) led to the project's cancellation, despite Perez having already drawn several pages. This caused resentments that prevented the companies from doing crossovers again for several years, and left many comics fans disappointed.

By the early 2000s, however, relationships between the companies -- both under new administrations -- were cordial again, and the project was revived, with Perez once again set to draw it, and a new story done by writer Creator/KurtBusiek. The series was a financial and critical success, and is even (apparently) considered canonical by both companies (the "Krona Egg" artifact has appeared in some issues of DC's ''Justice League'' and ''Trinity'' series, while the events of the crossover are mentioned in ''[[OfficialHandbookOfTheMarvelUniverse Handbooks of the Marvel Universe]]'').

The story involves Krona, a DC villain turned cosmic, obsessed with discovering how universes are born, and tearing several of them apart in the process. To save his universe, The Grandmaster, a cosmic being from the Marvel Universe, offered to give Krona the knowledge he wanted... '''if''' he beat Grandmaster in a game. Krona accepted. The "game" was to force the two superhero teams to compete against each other (without telling them the real reason) over several artifacts scattered over their worlds. This turned out to be a plan of the Grandmaster's to imprison Krona; it also resulted in a change of reality, creating a world where both teams had always co-existed. However, they discover the truth, and, finding out that Krona is about to free himself, decide to join forces to beat him once and for all. Alterations of time result in virtually every hero who had ever been an Avenger or a Leaguer showing up to help (but so did their enemies, under Krona's control). In the end, Krona is defeated and reality is restored to normal on both worlds.

It should be noted that this crossover seems to supersede the similar ''Marvel versus DC'' one that had taken places in the 1990s, despite that one having also (apparently) been canonical. This is never explained.

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!!This comic series provides examples of:

* AllYourPowersCombined: Busiek mixes and matches a lot interesting power combos.
** [[ComicBook/CaptainMarVell Photon]] copies Comicbook/GreenLantern's energy signature to effectively gain his powers.
** ComicBook/IronMan designs a complicated weapon that Lantern can then generate and use[[note]]Kyle Rayner's day job as a designer also helps, plus his constructs tend to be more complicated than his GL partners due to this[[/note]].
** Radioactive Man and Solarr generate Kryptonite's energy signature (which had been a tip-off from SelfDemonstrating/LexLuthor, no less) and red sunlight to de-power Franchise/{{Superman}}.
** ComicBook/GreenArrow briefly adds {{Hawkeye}}'s arsenal to his own.
** ComicBook/MartianManhunter lets ComicBook/CaptainAmerica command the entire battlefield simultaneously.
** And of course Superman armed with [[ComicBook/TheMightyThor Thor's hammer]] and Cap's shield.
** Kyle Rayner used the Cosmic Cube to recharge his power ring, which gave him a [[ComicBook/SilverSurfer chrome color scheme]] and a considerable power boost.
* AlwaysSomeoneBetter: Played straight and inverted with the speedsters. The Flash completely dominates Quicksilver in the DC universe, but since the Speed Force doesn't exist in Marvel, the Avenger gets the upper hand on his home turf once the Flash's stored energy runs out.
** Played straight with Hawkeye and Green Arrow. Clint is the better archer. Is key to saving the day, becomes the only hero in either universe to be inducted into both the Avengers ''and'' the Justice League. Then, to add insult to injury in issue #3 when the worlds are combined into a SilverAge utopia, he's dating Black Canary.
* AnythingButThat: When Superman knocks out Thor, the Avengers yell things in the line of "No! Not ''Thor''!" in anger.
* AwesomeMomentOfCrowning: Because of him and [[spoiler:TheFlash saving both the Marvel and DC universes from Krona, {{Hawkeye}} has been inducted into the Justice League.]] Yes, [[spoiler:Clint Barton currently holds the distinction of being a member of BOTH the Justice League and the Avengers; the premier superheroes of both universes.]]
* BackToBackBadasses: Superman and Thor take all comers.
* BattleInTheRain: Thor summons rain in The Avengers' first bout with the Justice League.
* BechdelTest: {{Lampshaded}} by She-Hulk: "Yo, [[WonderWoman Star-shorts]]! I figured that you'd be getting bored so I thought I'd hang with you. We can talk girl-talk. Y'know, butt-kicking, name-taking, like that."
* BerserkButton
** Superman (with some difficulty) knocks Thor unconscious. The Avengers go ''completely'' nonlinear upon seeing this, and [[ComicBook/TheIncredibleHercules Hercules]], ComicBook/IronMan, ComicBook/SheHulk, TheVision, and WonderMan viciously beat Superman into the ground.
** This in turn pushes Aquaman's BerserkButton, motivating him to summon a Godzilla-sized sea monster and warn the Avengers not to touch Superman.
* BigDamnHeroes: During the battle with Krona, Krona eventually ends up killing all of the heroes, Superman included, with one energy blast. [[spoiler: Save The Flash and Hawkeye (whom everyone had presumed dead earlier), Barry then proceeded to distract Krona to give Hawkeye a good shot.]]
* BondOneLiner: Superman, when he knocks out Wonder Man after taking down Ms. Marvel:
--> Sorry. She couldn't wait[[note]](until Wonder Man finished knocking Green Lantern out)[[/note]].
* BringIt: Superman on the cover of Issue #4.
** Hulk briefly during the battle near the end of issue #4.
* ButtMonkey: Poor Wally West really gets the short end of the stick in this one. On his first visit to the Marvel Universe he discovers that he has lost his powers, as there is no Speed Force there. He is summarily beaten by an angry mob mistaking him for one of SelfDemonstrating/{{Magneto}}'s Acolytes. He then gets owned by Iron Man. And then by Quicksilver (much to the latter's delight). Then he is completely AWOL in the big brawl at the climax (save a one-panel cameo as Dark Flash) and shows up at the very end, having ''just missed'' a chance to see Barry. He is owned by Quicksilver on their ''third'' encounter. Wally won the first two (though the second one was kind of accidental, because he was more worried about outrunning {{Darkseid}}'s Omega Beams than beating Quicksilver).
** Hercules, due to a misunderstanding gets beaten up by Wonder Woman. Later he's nearly killed by Screaming Mimi's SonicScream, only to be rescued by Black Canary...[[{{Irony}} another sonic scream user]].
* CatFight: In the background of one panel heroic Marvel catgirl Tigra is wrestling with villainous DC catgirl Cheetah.
* ChekhovsSkill: Photon learns enough from her first encounter with a power ring to drain Kyle Rayner's energy and use it to great effect. She later also uses this trick against [[spoiler:SelfDemonstrating/{{Sinestro}}.]]
** Subverted with Quicksilver. Hints are dropped that he'll learn how to access the Speed Force, but nothing comes of them.
* TheChessmaster: Metron, who conspires with Grandmaster
* CombatBreakdown: In the final battle, the Martian Manhunter establishes a telepathic link that allows Captain America to command the entire battlefield at once. Attack orders and enemy weaknesses are distributed in seconds, which allows the heroes to cut through Krona's defenses with a brutal efficiency. That all falls apart when the link is severed after Manhunter's swapped out thanks to a temporal shift, leaving the heroes to fend for themselves.
* ChromeChampion: The Cosmic Cube-powered Kyle Rayner, as noted by Ms. Marvel.
* ConflictBall: Yes, the reasons for the two teams fighting each other are incredibly contrived. Do you honestly care? Also the perfect example why this particular trope [[TropesAreTools isn't always bad]].
* ConservationOfNinjutsu: The combined strength of Superman and the Martian Manhunter is not enough to knock out Thor in the first fight. Later, Superman just about [[StrongAsTheyNeedToBe finds the strength]] to put Thor down by himself after a ''very'' short (but very brutal) fight.
* ContinuityPorn: The final battle. ''Every Leaguer and every Avenger up until that point vs. pretty much every villain both teams have faced''.
* CosmicEntity: Krona; Grandmaster
* CosmicKeystone: Several, from both universes.
* CrapsackWorld: Although it's played for laughs, the Marvel!Earth really does come off as this when compared to the DC!Earth, judging by the differing treatments that the superheroes receive. InUniverse, the Avengers even speculate that DC!Earth may be a CrapsaccharineWorld, where the "shiny gloss" conceals super-powered tyranny or some such thing.
* CrazyPrepared: Hawkeye keeps his Lead-Foil Containment Arrow around on the off chance that he'll run into Radioactive Man at any given moment. He has a plan for possibly bumping into ''one single guy''. Naturally this came in handy against CaptainAtom, but still, considering how often the Radioactive Man attacks the Avengers (the man was one of the original Masters of Evil), this makes a lot of sense.
* DeadAlternateCounterpart: In issue #3 the Marvel and DC worlds have become combined, turning it into a SilverAge utopia. When the characters learn how their realities are ''supposed'' to be, the character who argues for the restoration the most is Hal Jordan -- who is "supposed to" be dead (Barry Allen is there too, but he's not quite so eager to restore the realities until he convinces himself otherwise).
* DesperationAttack: Superman lands the knockout punch on Thor while lying on his back, leaving himself wide open for the Avengers' NoHoldsBarredBeatdown. Well, he got up, but he sure didn't expect to be knocked down again so soon.
* DeusExMachina: ComicBook/ThePhantomStranger shows up at a point where both groups are out of ideas and takes them where they need to go then vanishes. In other words, his usual schtick.
* DidYouJustPunchOutCthulhu: Krona casually and effortlessly whacks {{Galactus}} [[ComicBook/SecretWars like a bug]], which makes perfect sense as he had destroyed a significant number of universes at that point, and overpowered infinitely more powerful entities such as Eternity. And then builds a house out of him. Let it never be forgotten that Krona beat a planet-devouring entity within a minute, then ''built a house out of him''.
* DramaPreservingHandicap: There is no Speed Force in the Marvel Universe, which prevents TheFlash from winning Grandmaster's game single-handedly.
* EldritchLocation: the respective universes have this effect on Captain America and Superman, driving the otherwise reasonable heroes to pick up the ConflictBall. They get over it.
** Superman even comments that sunlight in the Marvel universe feels "greasy."
* ExpendableAlternateUniverse: Subverted. Several characters do try to invoke the idea several times throughout the series, but fail for differing reasons.
* {{Fanservice}}: On literally every page. And it's ''not'' just about Wanda's belly-dancer outfit.
* FirstBlood: Thor knocks Superman through a building with his hammer to start the battle in Metropolis, literally drawing first blood in the process.
* {{Foreshadowing}}
** Likely [[HarsherInHindsight unintentional]], but it's almost eerie seeing the ScarletWitch becoming corrupted by the evil of chaos magic, and nearly having a nervous breakdown when confronted with the memory of her children. This was a full year before ''Avengers Disassembled'' and ''ComicBook/HouseOfM'', remember.
** In the series, [[spoiler:Hawkeye (Green Arrow after the universe fluctuates mid-conversation and Flash is put in Hawkeye's place)]] had saved the day when he [[spoiler:fired an impossible shot]] to beat SelfDemonstrating/DoctorDoom. Guess how Krona is beaten?
** And forget not that some of the headlines the Avengers first saw in the DCU included feats such as Superman bringing water to drought-ridden lands and Wonder Woman working with the UN as Themyscira's emissary. The Avengers are bothered by the idea that if they were a little more out-of-the-box in their approach, the world might be significantly better. And what does Thor do immediately after this storyline? Become king of Asgard and begin trying to make the world a better place by doing more than just punching bankrobbers. ([[spoiler:It doesn't end well.]])
* ForgottenPhlebotinum: In the first encounter between the teams, Iron Man uses a device called the signature modulator to send the Justice League back to the DC universe against their will. That technology is never seen or mentioned again. Though this might be the only instance where it would have worked. Wally found it immensely difficult to crossover between the two universes even after the barriers between them are weakened (harder than many other universes he's been to) and snapped back to his universe on his own as his powers (and vibrations) faded. As the story progresses, the two universes move closer and closer together to the point that their histories start being retconned by historical instances of the two universes crossing over.
* FreakOut: Hal Jordan has one when it appears [[spoiler: Flash (Barry Allen version) and Hawkeye are killed.]] Sadly, he's swapped out for Kyle Rayner before he can do anything to the ones responsible. [[spoiler:Thankfully Kyle finishes what Hal started and vaporizes both villains due to a temporary power boost thanks to the Cosmic Cube]].
* FunnyBackgroundEvent: Plenty of them in the moments where many characters are on-panel. An example is the fight that opens volume 2, when you can see Batman do a flying kick right through an intangible Vision. The "whoa!" the look on Bats' face as he does so is priceless.
* GettingCrapPastTheRadar:
-->'''Batman:''' (''when he and Cap find him in the Grandmaster's base'') Atom?\\
'''[[ComicBook/TheAtom Atom]]:''' In the six-inch flesh, Batman!
* HamToHamCombat: TheFlash and Hawkeye engage in jovial banter, even in the ''first'' battle when the JLA and Avengers are enemies.
* TheHeart: DC's Franchise/WonderWoman and Marvel's [[TheWasp Wasp]] often act as this for their respective teams throughout the miniseries.
* HeroicSacrifice: [[spoiler:Vision]] gives Superman the last of his solar energy reserves to counter Radioactive Man and Solarr's ambush.
* HeroicWillpower: Using Green Lantern and Scarlet Witch's powers as a conduit, the classic members of both teams prevent their two worlds from being forcibly merged by concentrating ''really really hard''.
* HoldTheLine: The entire final battle is just to get Supes (armed with Cap's shield) to Krona - everyone else's job is to clear the way, leading to many such moments, including Wonder Woman, who gets some help from her Mom and She-Hulk (see the Heartwarming page for details).
* HulkSpeak: The Hulk's line about "puny-costume men".
* HypocriticalHumor: In scouting the Marvel Universe, Batman makes it perfectly clear that the other members of the JLA are not to interfere in the various aspects of Earth 616, such as Latveria. Shortly after, Batman comes upon ComicBook/ThePunisher shooting some drug dealers. Plastic Man goes to leave, only to turn around and see that Batman has crashed through the window, presumably to take down The Punisher. As they rejoin the rest of the JLA, Plastic Man [[WhatTheHellHero berates him for his interference]] (see image on the Funny subpage).
* IdenticalStranger
** Surprisingly not noted within the story itself, but Vision and Metron look a lot alike. Justified because they were both designed to resemble Creator/LeonardNimoy.
** Thor and Comicbook/{{Aquaman}} both have blue eyes, long blonde hair, and identical beards (on the second half of #3 and first half of #4 at least, in Thor's case). Only their headgear sets them apart in certain panels. (Plus their obvious height difference: Aquaman is 6'1" while Thor is 6'6".)
* JerkassRealization: It's clear that Superman and Captain America feel this way when they learn the shifts in reality have been affecting their temperaments.
* KickTheDog: Dreamslayer and Doctor Diehard pull off this trope when they [[spoiler: appear to kill Flash and Hawkeye]]. Their reasoning, the pair's "jovial banter" was inspiring the other heroes.
* LegacyCharacter: It's genuinely touching to see Barry Allen and Hal Jordan assuring each other that Wally West and Kyle Rayner will continue their legacies after they've died. [[BackFromTheDead Well, it was more poignant back in 2004...]]
* LetsYouAndHimFight: Trope picture.
** Several of the confrontations of this are of this nature; a partial subversion occurs between Batman and Captain America, however, who briefly test each other's skills before deciding that continuing the fight - which Batman states the Cap would, eventually, win - would be a waste of effort that would be better served finding out ''why'' they were put in that position in the first place.
** Another subversion is when Aquaman fights She-Hulk; he soon remembers that all he needs to do is go after the artifact they were sent there to collect, and so he flees from her to pick it up, while Wonder Woman is busy beating the crap out of a rather confused Hercules.
* LoadsAndLoadsOfCharacters: Even more than you'd expect, since the final issue features ''everyone'' who'd ever been on the roster of either team up until that point fighting virtually every villain they'd ever faced. That number gets really big considering that just about every major hero in the Marvel Universe has been an Avenger (save Comicbook/{{Daredevil}} pre-''ComicBook/FearItself'' and [[ComicBook/FantasticFour the Human Torch]][[note]]That's, obviously, without mentioning basically 99% of the ComicBook/{{X-Men}}[[/note]]), and no small number of heroes have joined the Justice League, including many members of the ComicBook/JusticeSocietyOfAmerica.
* MythologyGag: Loads and loads.
** The opening sequence in the first issue is an homage to the beginning of ''ComicBook/CrisisOnInfiniteEarths'', down to the Crime Syndicate's universe being the second one destroyed on-panel.
** In the beginning of the story, everything goes according to the continuity of both Avengers and JLA at the time. But, as the laws of reality get screwed up in the third and fourth issues, ''everything'' becomes fair game. Dead or forgotten characters are brought back for a moment, characters suddenly wear older outfits, ContinuityPorn of several major events of most characters, etc.
** In the third issue, the Masters of Evil are imprisoned in the omni-lingual Green Lantern bubble in which the Justice League trapped the pre-Crisis Crime Syndicate.
** Hawkeye becomes a Justice League member in the same manner as pre-Crisis ComicBook/BlackCanary (the Golden Age one).
** A painting of the JLA and Avengers' first meeting is modelled after the cover to the first JLA-JSA crossover.
** Heck, it even goes beyond the comics continuity. What toy does ComicBook/IronMan come up with when he gets his hands on a GreenLanternRing? Why, the [[VideoGame/MarvelVsCapcom Proton Cannon]]. To top it off, Iron Man is wearing the [[ContinuityNod Modular Armor]] when the cannon is fired.
** There's also the Marvel Comics Captain Marvel taking down BlackAdam while the DC Comics Captain Marvel punches out Ronan the Accuser, both each other's respective enemies. Also in the same panel is Marvel's Photon, who originally ''also'' called herself "Captain Marvel" (currently she goes by the name Spectrum). Meanwhile, the heroic female Doctor Light (something of an AlternateCompanyEquivalent to Photon) shouts "Captain Marvel, Look out!", to which ''both'' Captain Marvels reply "Thanks!"
** Franchise/{{Superman}} fighting Count Nefaria, a Marvel villain who was originally created as a parody/homage/AlternateCompanyEquivalent of... Superman.
** The panel where Superman catches Thor's hammer is almost identical to one from Count Nefaria's first fight with the Avengers after gaining his powers.
** Hawkeye considering the Justice League a "bunch of SquadronSupreme wanna-bes". Marvel's Squadron Supreme was originally created as a parody/homage/AlternateCompanyEquivalent of DC's Justice League. In fact, that particular scene was similar to the appearance scene of the Squadron Supreme at the begining of Kurt Busiek's run on the Avengers. "Five gets you ten they're mind-controlled!" is to point that Hawkeye is GenreSavvy and realizes the RecycledScript (the Squadron Supreme was indeed mind controlled back then). Of course, only the scene was similar, everything else that followed was different. As he pointed when he complained that the boomerang arrow would have worked with Whizzer; it ''did'' work with him.
** Franchise/WonderWoman angrily attacking Marvel's [[ComicBook/TheIncredibleHercules Hercules]], referring to him as the "despoiler of Hippolyta". In the DCUniverse, Heracles (a villain) at one point enslaved and raped Hippolyta (Wonder Woman's mother). In the MarvelUniverse, Hercules (a lovable hero who ReallyGetsAround) did at one point have an affair with Hippolyta... who's actually considered a ''villain'' there. (The event is based in Myth/ClassicalMythology, where Heracles/Hercules seduced Hippolyta, queen of the Amazons, and stole her belt. Marvel and DC both gave it their own spin.)
** One panel of the final battle has a shot of two established Spider-Man enemies fighting: Sandman (who had been an Avenger before, during a brief HeelFaceTurn) beating up the Scorpion.
** Black Canary beating Screaming Mimi with her Canary Cry, effectively turning the tables on her (who also has sound manipulating powers, and had just brought down Hercules with a sonic scream).
** A very meta one: after the two universes are temporarily merged, the story mentions prior team-ups of the teams. One of which is the plot of the cancelled crossover from the 80s, complete with a recreation of the original planned cover that had been seen many times before.
* NoHoldsBarredBeatdown: Superman gets one from the Avengers (specifically Iron Man, Vision, Wonder Man, Hercules and She-Hulk) after he punches out their buddy Thor.
* NotHimself: Superman and Captain America become paranoid and irritable once the walls between universes start to collapse, blaming it on each other. According to the Grandmaster, this is because they are the most in-tune with their respective universes.
* OffModel: Considering how the Scarlet Witch is artist George Perez's [[AuthorAppeal favourite character]], it's curious how he can't seem to draw her consistently at all. Every closeup of Wanda in this story looks like a completely different person. That's because she was trying to use far more Chaos Magic than she was used to having access to, and the effort was making her sick (her skin even gets pale to the point of grey at one point).
** Might count as a meta-MythologyGag, since Perez did something similar with Raven during his run on ''New TeenTitans'' when her powers were corrupting ''her'' in the same way.
* OffscreenMomentOfAwesome: Batman's fight with The Punisher isn't shown. Safe to assume it would have been awesome.
* OhCrap: Hawkeye's reaction to [[spoiler:Darkseid getting ahold of the Infinity Gauntlet. However, Darkseid discards it when he learns that the powers the gauntlet should allow him to control don't exist in the DC Universe]]. Made even better by the fact that Hawkeye recognizes Darkseid as being the most evil being in the multiverse even though he never met him (he says Darkseid "looks even worse than {{Thanos}}, if that's even possible").
* OneSteveLimit
** Averted, predictably enough. Dr. Light yells "Captain Marvel -- look out!" [[ComicBook/CaptainMarVell Marvel!Captain Marvel]] and [[{{Shazam}} DC!Captain Marvel]] simultaneously thank her. And in the background of that panel is Monica Rambeau/Photon, who originally went by "Captain Marvel" as well.
** Hero Despero takes out Villain Despero in one panel.
** This gets a lampshade as well:
--> '''Elongated Man:''' (''to Beast, after having talked to Ant-Man'') Hi, other Hank!
* OnlyTheChosenMayWield: [[ComicBook/TheMightyThor Mjolnir]], as usual, which is here shown to not normally have Superman deemed worthy, though he can overcome it in dire straits if Odin allows it.
* PinballProtagonist: Wonder Woman could be removed from the story and have almost no impact on the plot.
* PlotInducedStupidity: Plenty to go around, but Thor and the Flash suffer the most.
** Thor can block, deflect, and absorb energy attacks with his hammer, yet never tries to defend himself from Superman's heat vision. He is also [[SuperReflexes fast enough]] to block bullets and energy attacks, even those fired at point-blank range. Given how effortlessly Thor's defended himself from heat vision-style attacks over the years, even against opponents he's never fought before, for the God of Thunder to suddenly "forget" his most reliable defensive ability is bad writing at best. According to {{Word of God}}, both Superman and Thor were starting with their standard "tank" options and would have worked up to their more advanced abilities if the fight had progressed further. Alluded to when Thor mentions to Aquaman that he could have taken Superman now that he has his measure and knows how to counter him.
** Despite being [[DramaPreservingHandicap unable to use his powers]] in the Marvel universe, [[TheFlash Wally West]] should still be [[StorybreakerPower fast enough]] to defeat most of the Avengers by himself. As it is, Wally is limited to the basic speedster skill set: running fast, dodging attacks, and little else.
*** Possibly justified since most of his other tricks are based on the Speed Force.
* PoorCommunicationKills: Many of the fights in issues 1 and 2 could have been easily avoided had the League and Avengers actually discussed what was happening instead of pointing fingers at each other.
* PowerCreepPowerSeep: To fix the imbalance between the Justice League and the generally less powerful Avengers, the story plays on the idea that some characters have different power levels depending on which universe they're in. So in the DCUniverse, the higher levels of "chaos magic" make second-tier Avenger ScarletWitch powerful enough to take down the whole Justice League, while in the MarvelUniverse, the lack of a speed force makes the Flash nothing more than an ordinary human.
--> '''Flash''': She gets to be psycho-powerful over here, but I've got no powers over there? How fair is ''that?''
** Meanwhile, Iron Man is given a Mother Box by Metron. Yes, one of the most cunning inventors gets a ''sentient machine'' that extends his senses and feeds him technical data neurally.
* TheReasonYouSuckSpeech: Just before blasting Thor with his heat vision, Superman lays this on him (and the Marvel Universe as a whole):
-->'''Superman:''' Tell yourself that, Mister... ''Ease'' yourself to sleep at night while you let your world go to ''Hell''! Where I come from, though... '''''LIVES MATTER!'''''
* RedEyesTakeWarning: Superman, twice. But he's not the only one.
* RedOniBlueOni: Thor (Red) & Superman (Blue)
* RockPaperScissors: (Superman + Manhunter) < Thor < Superman < Doomsday < Thor < Count Nefaria < Superman
* RousingSpeech: Hal gives a one at the end of third issue. Despite knowing he has the furthest to fall, he argues the hardest to SaveBothWorlds.
--> '''Hal''': There are millions, maybe billions dead or dying in the worlds as they are. Can we choose their deaths, because they're easier to bear? The reality we saw--It's the ''truth''. Good, bad, love, pain--It's ''real''. It's the one we're pledged to protect. Not to play God with.
* SaveBothWorlds
* ShirtlessScene: Thor manages to lose his shirt not once, but twice.
* ShooOutTheClowns
** Hawkeye and ComicBook/PlasticMan are pretty much absent for the mostly somber third chapter. Notice how quickly they come back in the more adventurous fourth chapter.
** During the third chapter, the ''classic'' JLA and Avenger teams were around, i.e. Barry Allen and Hal Jordan are The Flash and Green Lantern, Aquaman still has his left hand, while Hawkeye is in his "blond hair, purple costume" look and not a part of the Avengers.
* ShoutOut: Several, but especially, to the ''original'' story for the crossover.
** ''ComicBook/CrisisOnInfiniteEarths''. Barry Allen pulls nearly the same trick on Krona that he did on the Anti-Monitor. Of course, Barry was only [[spoiler:distracting Krona to give Hawkeye a good shot]]. Since it was only [[spoiler:a distraction, it wasn't literally fatal for Barry, though Wally returned, sending Barry back to his normal state: dead]].
** Signs in Metropolis include the following: [[Franchise/{{Superman}} Siegel Shuster Co.]], [[Franchise/WonderWoman Marston Industries]], and [[Franchise/{{Batman}} Kane]].
*** This could also be a MythologyGag as both universes have been naming in-universe buildings and streets after creators for decades. Especially DC.
** At one point near the end of issue #4, at Iron Man's direction, Green Lantern whips up a large energy gun that's identical to Iron Man's [[VideoGame/CapcomVsWhatever Proton Cannon]].
* SortingAlgorithmOfEvil: Used in the final issue, and [[JustifiedTrope a reason is given for it, too]]. Krona wants to use all the power he can to continue his research, and as little as necessary to spend on the heroes. So at first he uses just a tiny bit of power to summon the easiest, lamest goons with practically no willpower; easy to control, both physically and mentally, and throws them at the heroes. As they tear through the mooks, however, Krona is gradually forced to use more and more power and recruit stronger, smarter villains (as Metron [[LampshadeHanging lampshades]]) until at the end, he is literally summoning gods and world-destroying fire demons. Finally, he ends up destroying all of the heroes, Superman included, with one energy blast. [[spoiler:Save The Flash and Hawkeye, who save the day.]]
* StoryBreakerPower: Most of the items that the Avengers and the Justice League were seeking in the first and second issues have the power to completely derail the story. The Grandmaster know this, and took caution to prevent them from being able to ''use'' them. They were contained in energy spheres, and disappeared when either team captured and secured it. Darkseid broke the energy sphere around ComicBook/TheInfinityGauntlet, but it turned out to be conveniently useless in the DC universe.
* StatusQuoIsGod: By necessity, since neither company can ''directly'' cite the other's trademarked characters. However, the ''JLA'' arc immediately after this crossover spun out of the destruction of the Anti-Matter universe in the first issue. Also Krona only managed to escape the Cosmic Egg much later in ''Trinity''[[spoiler:, as well as being one of the masterminds behind the events of ''ComicBook/BrightestDay'']].
* StrongAsTheyNeedToBe: Superman and Thor are as strong as the plot requires. Thor can take on Superman and the Martian Manhunter simultaneously in the first fight, but Superman alone can knock him out (even so, Thor claims in the last issue that he has a good idea of how powerful Superman is and could possibly beat him in another fight). In the final battle, Superman defeats Count Nefaria, a villain who can take on Thor ''and'' the entire Avengers team at once. Rising to the challenge, Thor defeats Doomsday, who is famous for killing Superman. {{Word of God}} is that Thor only knocked Doomsday off the panel, not that he was actually defeated.
* TakeThat: George Perez ''hated'' Vibe, so when it came time to draw every Justice Leaguer and Avenger in the final battle, all that can be seen of Vibe is his legs as he falls off-panel.
* TakeUpMySword: First Captain America gives Supes his shield, then Thor tosses him his hammer at a critical moment.
* ThisLooksLikeAJobForAquaman: One of the artifacts the heroes seek is at the bottom of an incredibly deep pool of water at Odin's tomb.
* TimeTravel
* TookALevelInBadass
** Yes, Scarlet Witch, the DC Universe has Chaos Magic, too, but it's a little ''different'' there. Let's just point out The Lords of Chaos are an organization of disembodied God-like beings capable of wielding nearly infinite power. Zatanna even states that Witch is ''freaking the Lords out''.
** Iron Man gets a significant power boost after interfacing a Mother Box with his armor. His sensors gain range and sensitivity, which allows him to detect and stun a surprised Wally West. Iron Man's repulsor blasts become strong enough to overpower Captain Atom, whose body was still smoking minutes after the battle. Even Superman cannot withstand their power, as a full blast to the chest leaves the Man of Steel helpless while the Avengers swarm him.
* {{Ungrateful Bastard}}s: The fact that the Marvel Universe citizens are these while the DCU citizens are very much ''not'', gets played for laughs. Praise of the DC heroes in the news and overt friendliness and respect from the curious DCU civilians come as a big shock to the Avengers. Quicksilver is pissed off at the fact that TheFlash has an entire museum dedicated to him, while Quicksilver has been hounded by anti-mutant prejudice all his life, and Cap (being NotHimself at the time) even says the DC heroes must be tyrants who force the human race to worship them. Conversely, when Superman sees a broken and vandalized Hank Pym statue, he gets angry because the Marvel Universe's citizens have no respect for their heroes, which to him must mean that they aren't doing enough.
* UnlimitedWardrobe
** The Wasp goes to the extreme by having a different costume in every panel she appears in during the final battle. This is a MythologyGag -- the Wasp has had more different costumes than any other superhero ever (somewhat justified by the fact that she's a fashion designer in her civilian life).
** The Atom, as well.
** In both cases this was caused by the time-warping effect. And it applies to the other characters as well (Superman even appears in his blue energy form).
* UpToEleven: Superman [[http://superherouniverse.com/articles/fights/superman-vs-thor.jpg notes this explicitly]] with his knockout punch to Thor, by ''holding Mjolnir mid-swing''.
* VitriolicBestBuds: Makes you wish for a Green Arrow/Hawkeye crossover someday.
* WeAreTeamCannonFodder: Just about everyone in the final battle, especially those brought in by waves of chronal chaos.
* WhatTheHellHero
** Franchise/WonderWoman and TheWasp have both had enough of Superman and Captain America's animosity by issue #3.
** Plastic Man chews out Batman after the latter's off screen fight with The Punisher.
* TheWorfEffect: Terminus nearly kills Superman with an energy blast. Starro turns Thor into a brainwashed slave. After this, Superman and Thor spend most of the story giving each other the Worf Effect.
** Captain America and Batman also each take down one of their counterpart's most troublesome foes. During the final battle, Captain America defeats Prometheus [[note]]whose helmet allows him to fight as skillfully as the world's greatest fighters (including Batman himself -- whose abilities he explicitly said he'd be using), has taken on the entire Justice League, and beat Batman in their first fight[[/note]]. On the next page, Batman is seen taking down Taskmaster [[note]]whose photographic reflexes allow him to fight as skillfully as any fighter he's ever watched (including Captain America himself), has taken on the entire Avengers team, and has won a round against Cap at least once[[/note]], right after having beaten Batroc, whom Bats commends as being fast and skillful. Notably, Taskmaster wasn't the only one who showed up to fight the Bat at that moment: he was with people like Crossbones, Titania, Zaran, Razorfist, Libra and others. Could the Dark Knight take them all alone? Maybe, maybe not. But then...
--->'''Black Panther:''' Good day, Batman. I was wondering if you'd need a hand?\\
'''Huntress:''' (''showing up along with Black Widow'') Or maybe six?\\
'''Batman:''' If you people have nothing better to do...\\
(''bad guy smackdown ensues'')
* XanatosGambit: At the story's end, Metron notes that ''everybody'' won this one, in one way or another. Even Krona, [[AndIMustScream in a manner of speaking.]]
* YourMagicsNoGoodHere:
** The Speed Force doesn't exist on the Franchise/MarvelUniverse's Earth, so ComicBook/TheFlash's SuperSpeed doesn't work.
** Darkseid gets ahold of the Infinity Gauntlet, which would normally fall under the category of ''worst thing that could ever happen'', but its vast power to manipulate reality is attuned to a ''different'' reality so it's useless to him.

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