'''''X-Men: Children of the Atom''''' is the beginning mark for the VideoGame/MarvelVsCapcom series.

Sometime around 1994, Creator/{{Capcom}} gained the rights to make video games based on the heroes of Creator/MarvelComics, starting with VideoGame/XMenMutantApocalypse for the UsefulNotes/SuperNintendo. This being the early 90's, with ''Franchise/StreetFighter'' mania in full swing, they decided to start with a FightingGame using the Comicbook/{{X-Men}}.

The game had six of the X-Men (ComicBook/{{Cyclops}}, ComicBook/{{Wolverine}}, ComicBook/{{Psylocke}}, Iceman, Colossus, and ComicBook/{{Storm}}) and four of their enemies (Silver Samurai, Omega Red, Spiral, and a Sentinel) taking each other on in a series of one-on-one battles, before fighting their way through the Juggernaut and facing SelfDemonstrating/{{Magneto}} in a final showdown. Akuma, from ''[[VideoGame/StreetFighterII Super Street Fighter II Turbo]]'', makes an appearance as a GuestFighter SecretCharacter, thus paving the way for the eventual coming of VideoGame/CapcomVsWhatever.

The game featured a unique exaggerated and animesque style accompanied by massive screen-blasting [[LimitBreak Super Combos]] and the ultra-high jumps needed to avoid them.

Naturally, the game was a hit, and it was followed in 1995 with '''VideoGame/MarvelSuperHeroes'''.
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!This game shows examples of:
* AdaptationalHeroism: Colossus was actually a member of Magneto's Acolytes at the point in time in the comics when this game was released, and while the game's code shows references to this story arc were originally going to be included (he was going to have the option of choosing whether or not to join up with Magneto, apparently) they were ultimately DummiedOut and he decisively rejects Magneto in the final product.
* AnIcePerson: Iceman.
** Also Storm in some of her attacks.
* AscendedExtra: Sentinel.
* AttractMode
* BarrierWarrior: One of Magneto's most frustrating moves. He can erect an electromagnetic barrier at will which makes him completely invulnerable.
* BigBad: Magneto.
** TheDragon: Juggernaut.
* BloodKnight: Akuma
* BlowYouAway: Storm uses wind attacks as a few of her specials, and combines it with AnIcePerson for one of her Supers.
* CallingYourAttacks:
** '''''[[MemeticMutation BEHOLD!]]''''' '''''[[Comicbook/{{X-Men}} OPTIC BLAST!]]'''''
* TheCameo: Several:
** The Acolytes Exodus, Delgado and the Kleinstock brothers Sven and Harlan all cameo in every character's ending. A fifth Acolyte, Anne-Marie, was to be included too, but she was DummiedOut for reasons unknown.
** Forge cameos in Storm's ending.
** Jean Grey cameos in Cyclops's and Wolverine's endings.
** Mojo cameos in Spiral's ending and as an ice sculpture in Iceman's ending.
** Professor X cameos directly in Colossus's ending, as well as appearing as the last sprite in the credits roll.
* CombatTentacles: Omega Red
* DeathOrGloryAttack: Storm's Hailstorm Super.
* DespairEventHorizon: Virtually every ending has Magneto question why they fought him and ask to join his Acolytes. When they refuse, Magneto's response is always to leave him to his fate, which is going up with Avalon.
* EarlyInstallmentWeirdness: This game is often times a completely different animal from every Marvel fighting game Capcom would later make.
** The game in general is slower-paced and shows more ''Franchise/StreetFighter'' roots in the combat; although it had chain combos, they were much more awkward, and it had many restrictions placed in the combat system as a whole that prevent the game being played quite as crazily as later entries. If one puts ''a lot'' of time into the game, a lot of the craziness will be there, but in somewhat different of a fashion than later Marvel games.
** The ManaMeter is completely different. Whiffing normal moves does not fill it like it does in every pre-''[=MvC3=]'' game (although special whiffs still fill it). Escaping throws and off-the-ground hits, normal abilities in all later games, instead ''cost meter'' here; this is particularly dangerous in this game because of how insane the throw damage is at times. Some characters wouldn't even just tech throws, they would instead ''counter'' throw the opponent during their throw attempt. Many characters have "X-Abilities" usable with only half of the meter, some of these (such as flight for Storm and Sentinel) later become standard moves.
** Characters get dizzied insanely quickly; often any even small combo will dizzy. ''Marvel Super Heroes'' would also have a dizzy mechanic, and indeed dizzy combos were still possible, but they were made much harder and games after that would generally only dizziness to something of a ComboBreaker mechanic used after utterly long combos.
** Launchers share very little in common with later games. After hitting with a launcher, you have to input a regular super jump motion to cancel it instead of just tapping up, and they often hit at an angle making a follow-up much less straight forward to do unless you have the opponent cornered.
** Although some of the later games have weight systems, it is ''much'' more significant in this game, making it so several combos only work on certain characters and the effects of launching are completely different.
** There is no [[VideoGame/StreetFighterAlpha Alpha Counter]]-like mechanic; instead, one of the alternate uses for each character's super is that they can all be used as counters.
** The characters have much fewer moves in general and many of the fighters that showed up in later games prior to ''[=MvC2=]'' have completely different movelist. Wolverine for example only has his Berserker Barrage as a super, has a HealingFactor move all his later incarnations lack, and has a much more limited chain combo system.
** Several of the stages can actually change over time, such as breaking floors or having destroyable obstacles, actually significantly affecting the combat sometimes. ''MSH'' would make only one stage non-standard and all the other games would generally try to make battles on certain stages indistinguishable from one another.
** There is a sudden death mechanic activated when a match is effectively tied at the end.
* EverythingsBetterWithDinosaurs: In Wolverine's stage, Savage Land.
* GratuitousNinja: Psylocke
* GuestFighter: [[Franchise/StreetFighter Akuma]], as a SecretCharacter.
* HighlyVisibleNinja: Psylocke again. Silver Samurai's stage also has background ninjas in bright purple that periodically SmokeOut.
* HumongousMecha: Sentinel.
* ImmuneToFlinching: Juggernaut in this game won't flinch unless struck by a barrage of blows or a particularly powerful one. This may very well be the TropeCodifier of this concept in fighting games, or at least where it started to get popularized.
* JigglePhysics: Psylocke is quite bouncy.
* KatanasAreJustBetter: Silver Samurai.
* LadyMacbeth: Spiral's ending sees her talk Mojo into launching a new show, "[[AlienInvasion The Fall of Earth]]".
* LifeDrain: Omega Red could drain the health or super meter of an opponent, doing so would refill his health/super meter.
* LightningBruiser: Sentinel, especially when flying.
* MacGuffin: As usual, Omega Red is hunting for the Carbonadum Synthesizer to stabilize his mutant death factor. His ending has him find it laying hilariously out in the open in a random Avalon hallway.
* MightyGlacier: Juggernaut is as unstoppably strong as he is in the comics, but he moves rather slowly and purposefully here.
* MythologyGag: Mojo makes a joke about [[VideoGame/XMen2CloneWars cloning everyone]] in Spiral's ending.
* PragmaticAdaptation: ''Children of the Atom's'' storyline is a LighterAndSofter retelling of the ''[[http://marvel.com/comics/events/249/fatal_attractions Fatal Attractions]]'' story, reusing its basic premise and adding in a throwaway line in the manual about Magneto recruiting mutant villains to justify the presence of characters like Omega Red and the Juggernaut.
* PunchClockVillain: Spiral references this trope directly in her ending, telling Magneto it's NothingPersonal and that she's just doing her job. Is it her fault she enjoys it?
* RocketPunch: Sentinel. It even says those two words.
* ShockAndAwe: Storm's primary form of offense, as well as several of Silver Samurai's attacks.
* {{Shotoclone}}: Cyclops.
* ShoutOut: Check [[ShoutOut/CapcomVsWhatever the page]].
* SNKBoss: '''Magneto'''. His AI is complete bullshit and seeks to royally piss you off at the worst time possible. He can fly away well out of your characters' reach and assault them with an extremely fast, damaging projectile. He has another move where he sends in four magnetic balls that are ''unblockable'' and home in on you, and when he catches them he can do whatever he wants. His super hits off-the-ground and unlike in other games reaches the top of the screen vertically, plus does ridiculous damage and it's very hard to avoid it. He's really fast, does a ton of damage with just a few blows, he is really difficult to get inside of and just has everything, including a rapidly regenerating super meter and a shield that makes him completely invincible, as described above.
** PuzzleBoss: Then again, if you study him long enough, you will notice that he always follow a strict pattern which you can exploit.
* SpaceBase: Avalon, Magneto's space station and stage for the FinalBoss fight with him. It was a pretty revolutionary stage for its day too, cycling through four different backgrounds to represent Magneto pulling the battlefield into different levels of Avalon.
* {{Stripperiffic}}: In the ladies' side, we have Psylocke. And in the men's side, if one is feeling crazy, [[HuskyRusskie Colossus]].
* SurprisinglyGoodEnglish: All the characters save Silver Samurai are voiced by native English speakers.
** In fact, most of them have their [[WesternAnimation/{{X-Men}} Animated Series]] voice actors.
* TurnsRed: Juggernaut's super.
* WhenAllYouHaveIsAHammer: Many of Cyclops' moves (in this game and the later ones he appears in) are basically various forms of optic blasts.
* WolverineClaws: Wolverine, duh.
* ZerothLawRebellion: In Sentinel's ending in ''X-Men: Children of the Atom'', [[spoiler:after defeating Magneto, Sentinel returns to earth. Then, the complete Sentinel line is activated and they start to wipe all the mutants on earth. After the success of the mission... they [[KillEmAll start wiping out humanity]]!]]
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