A FanFic crossover between ''Franchise/{{Batman}}'' and the ''Comicbook/SinCity'' comics.

The story begins with the Yellow Bastard visiting Gotham City in order to "meet the locals", accompanied by his henchmen [[ThoseTwoBadGuys Shlubb and Klump]]. His actions draw the attention of both the Scarecrow and Batman. Batman defeats Scarecrow and sends Shlubb and Klump to jail, but the Yellow Bastard escapes back to his senator father. Batman tries to interrogate Shlubb and Klump in jail, but a federal agent takes them back to Sin City before Batman can discover the identity and whereabouts of the Yellow Bastard. The news that two {{Mooks}} managed to escape Batman's grasp spreads through Arkham Asylum. The rogues gallery escape Arkham and travel to Sin City in order to set up operations under the belief that they could more easily get away with their crimes.

Of course, this doesn't sit well with Batman.

While tracking them through Sin City, Batman is faced with the corruption of the city, meeting the [[AntiHero anti-heroes]] from that series as well as fighting many of its villains. Needless to say, his alliance with the likes of Marv and Miho doesn't work well.

The story weaves in and out of Sin City continuity and is narrated by various characters in each chapter. While it's not explicitly stated, the story takes place some time during the 90's era of Batman.

The story can be read [[http://www.fanfiction.net/s/6117857/1/bA_b_bDark_b_bKnight_b_bOver_b_bSin_b_bCity_b here.]]

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* BatmanColdOpen: Obviously.
* BatmanGambit: It's not always Batman pulling this off. The SinCity anti-heroes have their moments too:
** Batman [[CrazyPrepared knew exactly what to pack in his utility belt]] in case he ran across Killer Croc or was captured by Poison Ivy.
** Batman and Wallace's trap for Two Face and his men.
** Blue Eye's plan to capture Batman.
** The entire SinCity underworld preparing to take Batman out, which involves a BlackHelicopter, [[TheDragon Manute]], and a [[MoreDakka whole lotta ammo.]]
** TheJoker's entire plot involves this, as usual. He also seems to be [[GenreSavvy the only Batman villain that expects to meet Batman.]]
* BigDamnHeroes: A few instances.
** {{Robin}} pops up briefly to help in the first chapter.
** Batman shows up just in time to stop Dwight from being carved up by Mister Zsasz and Mariah.
** Marv inadvertently saves Batman when he attacks Killer Croc.
** At the climax [[spoiler: Batman is at Joker's mercy, only for Miho to step in.]]
* BodyHorror: Joker's plan [[spoiler: which involves setting up explosives connected to drums of a new type of toxin on the roof of an orphanage. When the bomb goes off, the children left alive (and likely horribly disfigured) would be let loose on Sin City as an army of homicidal, mutilated kids.]]
* BuffySpeak: How Dwight, the Yellow Bastard, and Liebowitcz describe the TechnoBabble coming from Batman or the Scarecrow.
* CombatPragmatist: In his second round with Killer Croc, Marv hits him with a car, whacks him several times with a fire extinguisher, [[AHandfulForAnEye blinds him with the extinguisher's contents]], and then tries to shoot him point blank in the head. That's one way to even the score.
* CrazyPrepared: Batman and Joker, obviously.
** Miho seems to keep enough weapons on her to arm an entire ninja clan.
** Blue Eyes also seems to go to a lot of trouble to shove a needle in Batman's neck. Then again... [[BadAss it's Batman.]]
* DeadpanSnarker: Marv, most notably in his fight with Joker where he tries to inject him with toxin.
--> '''Joker:''' It's just a little prick.
--> '''Marv:''' I don't care what you got in your pants, pal!
* DinerBrawl: Wallace vs. thugs in an Italian restaurant.
* DirtyCoward: The Yellow Bastard practically admits to being one.
** The Riddler doesn't exactly have a strong backbone.
* DrowningPit: Batman gets tossed in one thanks to [[spoiler: Poison Ivy and Blue Eyes.]]
* EmpathicEnvironment: When Batman first shows up, it is during a freezing snowstorm in Sin City. By the time he leaves, it's scorching hot. There seems to be little in between, and it reflects the mood of the story.
* EnemyMine: Batman has this relationship with Comicbook/TheRiddler... for a while.
** The Sin City police force reluctantly bring Batman in on a case, knowing full well that he could expose their corruption.
** Wallace agrees to help the Magliozzi Family take down Two Face in order to protect his friends.
* EvenEvilHasStandards: Scarecrow mentions that he found the Yellow Bastard "distasteful". He also seems to have little regard for his Arkham inmates.
* FireForgedFriends: Miho seems to consider Batman a friend after they [[spoiler:take down the Joker]]. While Batman still has contempt for her, he still admires her for reasons he never fully understands.
* GeniusLoci: Sin City is treated as a living being, [[EnvironmentalSymbolism at least metaphorically.]] Batman and other characters describe it laughing at them, twisting their psyche, and growling at one point.
* TheGhost: Ava Lord, the Roarkes, and Herr Wallenquist are all mentioned several times in the fic. They are major SinCity bad guys and are said to be interacting with the Batman rogues but are never depicted in-story.
* IRejectYourReality: Despite being locked up in Arkham Asylum, the Scarecrow not only openly dismisses his fellow inmates as crazy, but refuses to believe that he is just as insane.
* JackBauerInterrogationTechnique: Batman interviewing Shlubb and Klump.
* LetsYouAndHimFight: Averted when Batman meets both Dwight and Wallace, invoked when Batman meets Miho, and inverted when he meets Marv (they team up and THEN fight).
* NoNameGiven: Since every chapter is written from the POV of a different character, they don't always say the names of the people they meet:
** Batman fights Kevin, but since he's mute and Batman never learns his name, he remains nameless. Readers unfamiliar with Sin City might not know who he was.
** In the Yellow Bastard's chapter, he simply refers to Batman as "You Know Who".
* NotDistractedByTheSexy: Batman spurs Blue Eye's advances.
* NoHoldsBarredBeatdown: Killer Croc vs. Marv. Both fights. Different winners.
* NoHonorAmongThieves: Very much so. [[spoiler:While Batman's rogues meet once in a somewhat polite manner, they make it very clear that they will turn on each other once their goals are met. Of course, the entire meeting was set up by the Riddler who planned a preemptive backstab: he had previously contacted Batman and set them up. This was so that he could get them out of the way and have full loyalty of the Sin City underworld. He is then essentially betrayed by the Sin City mob who attack Batman in such a way that they don't care if he's killed in the crossfire.]]
* OnlyAFleshWound: In typical Sin City/Batman fashion, the characters get beaten, stabbed, shot and more, but keep going.
* ThePlan: The Riddler stages a meeting with most of Batman's Rogues and secretly sends clues to Batman to let him know about the meeting and show which rogue is the most immediate threat. He also makes a bargin not to commit any crimes until Batman captures the others. Batman knows that Riddler is doing this in order to get rid of his competition but has little choice but to follow through with the plan due to the immediency of the situation. Riddler keeps his promise while Batman takes out his rivals [[spoiler: but Nigma never said anything about letting the Sin City underworld know about Batman's actions or where to find him.]]
* PunchPunchPunchUhOh: When Marv first shoots/punches Killer Croc. Although Marv takes it more lightly than most cases of this trope.
* ShoutOut: A few.
** When Dwight first meets Batman, he calls him [[ComicBook/AllStarBatmanAndRobinTheBoyWonder "The goddamn Batman".]]
** At one point, Marv drives a black 1957 Mercedes into Killer Croc. This model of car is significent in that it was one of the first batmobile designs and is very iconic while at the same time, vintage cars are normal in Sin City.
** Chasity, an original character, wears an S&M mask that not only resembles the bat-mask but also resembles the mask Gail wore in the original Sin City story and ''A Dame To Kill For''.
* SteelEarDrums: Averted when Btman is caught by Joker's explosives.
* SwitchingPOV: As mentioned above, every chapter has a different narration.
* VillainTeamUp: Since this is a crossover fic, there are multiple examples:
** Yellow Bastard and Scarecrow
** Mr. Zsasz and Mariah
** The Riddler and Manute
** Poison Ivy and Blue Eyes
** Two Face and [[spoiler:Deadshot, which is the only teamup between Batman rogues and a bit of a surprise cameo to boot.]]
** The entire SinCity underworld (or at least most of the main villains) plot together to kill Batman.
* VillainousCrush: As usual, the Joker all but admits that he's in love with Batman. He mentions that he missed Bats while he was visiting Sin City and even [[spoiler:decides to create a literal bat family by injecting victims with a new serum that turns them into {{Blood Knight}}s. He then dresses them up as Batman and BatWoman. Later, he decides to make "children".]]
* TeethClenchedTeamwork: Practically anytime Batman has to team up with a Sin City character.
* WorkingTheSameCase: How the heroes cross paths.
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