History Fanfic / ShelluvaBoss

''Shelluva Boss'' is a crossover between ''Franchise/TeenageMutantNinjaTurtles'' and the ''Franchise/{{Hellaverse}}'', specifically focusing on the [[WesternAnimation/TeenageMutantNinjaTurtles2003 2003 animated Turtles]] meeting the characters of ''WebAnimation/HelluvaBoss'', written by Lightyearpig that began in January 2024.

* UnexplainedRecovery: It's currently unknown how the Cyber Shredder is in Hell despite him being a digital engram, thus not an organic being, and how he decided to inhabit Robo-Fizz's body.

-->'''Ch'rell:''' You see, before I was wrongfully banished here, I was a humble man who had seen enough of the world and beyond to expect the extraordinary. And trust me when I say that Hell has truly been extraordinary so far, but as I said, I did not deserve to come here. I was condemned to spend the rest of eternity in this cesspool of villainy by a malevolent force of ninja that I have worked tirelessly to defend the world from. This is a corrupt and evil force that is out there right now in the living world, working its insidious tentacles into every aspect of humanity. They are an organization devoted to obtaining power through crime and corruption on a global level. Unfortunately for them, I was the only one who dared stand against them as my master and his master did before me. Although it was my destiny to save the human race and lead them into a new era, I was robbed of my victory in the end. If you and your associates can find it in your hearts to stand with me, you will be given everything you could ever want.

** When Loona gets bored and looks at her phone, she comes across a Channel 6 news report of a Purple Dragons crime spree being reported on by Irma Langenstein.

** Kavaxas is stated to be rather hotheaded, a reference to Hothead from ''VideoGame/TeenageMutantNinjaTurtlesTournamentFighters'', who inspired Kavaxas's creation.

** The Turtles have been thinking of moving to another lair, with Donnie mentioning an abandoned church in Alphabet City where they took up resident in [[ComicBook/TeenageMutantNinjaTurtlesIDW the IDW comics]].
** Vernon Fenwick reports on the Purple Dragon massacre from the first chapter and interviews Hun.

* LeaveNoWitnesses: Ch'rell orders Striker to murder everyone last prisoner and guard at Rikers Island after stopping by to collect Master Khan and recruit him into the Neo-Foot Clan. Hun is the only other survivor of the massacre due to following Shredder back to Hell.
* LetsYouAndHimFight: Ch'rell pits the Immediate Murder Professionals against the Teenage Mutant Ninja Turtles as a way of keeping them both distracted while he uses Stolas's grimoire for his own evil plans.

* BitchInSheepsClothing: Ch'rell lies about being a heroic figure in life who claimed that the Turtles were the real villains. Blitzo buys the act hook line and sinker, but Moxxie has his misgivings about Ch'rell.

* HowWeGotHere: The story begins with the Ninja Turtles battling I.M.P in a warehouse on New York Harbor that is decorated with the bloodied remains of numerous Purple Dragon thugs.

* ManipulativeBastard: Ch'rell manages to successfully convince I.M.P to hunt down the Turtles and hand him the grimoire for protection.

* ObviouslyEvil: Ch'rell, obviously, which makes Moxxie the only member of I.M.P to be suspicious of their new client.

* ShipTease: Loona and Raphael's rematch ends with the two in a compromising position, which Raph finds hilarious while Loona asks [[ArentYouGoingToRavishMe if he wanted to have sex]] as the two CrushBlush at each other before engaging in some awkward silence. It was intended to be a joke, but after readers compared the two's relationship to Raphael's flings with [[ComicBook/TeenageMutantNinjaTurtlesAdventures Ninjara]] and [[ComicBook/TeenageMutantNinjaTurtlesIDW Alopex]], the author made the realization that they actually would make a cute couple.

* WeirdCrossover: While the Ninja Turtles have gone into darker territory before, they're mostly known as a family-friendly franchise. ''Helluva Boss'' on the other hand is an adult cartoon that wears its target demographic on its sleeve.

** Ch'rell's ColdOpening narration begins with the final battle against him at the end of ''WesternAnimation/TurtlesForever'', where he attempted [[OmnicidalManiac the complete and utter destruction of the Ninja Turtles multiverse]] by destroying the prime universe Turtles from the Mirage Comics before being destroyed by his own upgraded Technodrome.

** When Michelangelo mentions the Garbageman as a possible suspect as to who hired Blitzo, he also references the events of the uncompleted fifth season episode [[Recap/TeenageMutantNinjaTurtles2003S5E6NightmaresRecycled "Nightmares Recycled"]], which ended with the Garbageman falling into a vat of acid. The Garbageman himself later references how he was originally going to be Hun's conjoined twin.

** Serling from the sixth and seventh seasons is revealed to have been returned to 2105, which explains his WhatHappenedToTheMouse status in ''Turtles Forever''.

* DemographicDissonantCrossover: The usually family-friendly Ninja Turtles cross paths with the cast of the adult cartoons set in the ''Hellaverse''. While the Turtles have targeted older audiences and tackled darker subject matter before, with the 2003 animated series being acclaimed for sticking the closest to the original Mirage Comics compared to other versions of the franchise, ''Helluva Boss'' on the other hand is a violent and raunchy adult comedy taking place in Hell. The author is aware of how bizarre this idea is, but he also states that he managed to make crossing ''WesternAnimation/GravityFalls'' over with both ''Anime/{{FLCL}}'' and ''Manga/SoulEater'' work when he wrote ''Fanfic/FoolyFalls'' and ''Fanfic/GravitySoul''.

-->'''Leonardo:''' He's vicious.
-->'''Donatello:''' Lethal.
-->'''Michelangelo:''' Competent!

** Blitzo, Moxxie and Millie disguise themselves with trenchcoats and fedoras like the Turtles would sometimes use when going up to the surface, mainly in the [[WesternAnimation/TeenageMutantNinjaTurtles1987 1987 cartoon]]. Millie then says "Here's looking at you, kid!" in a Creator/HumphreyBogart voice much like Raphael did when the Turtles were adopting that disguise for the first time.

** After Splinter concludes his flashback, Blitzo says that he expected Splinter to be WasOnceAMan, which Donatello says is the origin story of the 80s' cartoon Splinter.
** The Turtles have been thinking of moving to another lair, with Donnie mentioning an abandoned church in Alphabet City that they took up residence in [[ComicBook/TeenageMutantNinjaTurtlesIDW during the IDW comics]].
** Vernon Fenwick reports on the Purple Dragon massacre from last chapter and interviews Hun.

* PrecisionFStrike: Hun, who usually says "Aw crud" in lieu of any actual swearing, does this after accidentally wandering into Hell while chasing Shredder and discovering the Neo-Foot Clan.

-->'''Philip:''' Aw crud, I always thought by this point in my life, I'd be the one making the crank calls.

-->'''Michelangelo:''' We should really put up a SwearJar at some point. Seriously, is Hell just full of people who love saying bad words all the time?

* Blitzo asks Shredder if he's ordering I.M.P to kill whoever made fun of his [[Franchise/StarWars Darth Vader]] cosplay.

** While explaining what he researched about Hell to April and Casey, Donatello brings up how Lucifer Morningstar is a separate entity from {{Satan}}.

* RunningGag: A character getting shocked by I.M.P's swearing followed by saying they haven't heard language that foul since [[NoodleIncident Raphael stubbed his toe that one time]].
* ShipTease: Loona and Raphael's rematch ends with the two in a compromising position, which Raph finds hilarious while Loona asks [[ArentYouGoingToRavishMe if he wanted to have sex]] as the two CrushBlush at each other before engaging in some awkward silence.

* AHellOfATime: The Utrom Shredder is practically thriving in Hell since he's already a cruel, violent sociopathic megalomaniac to begin with, and he makes the most of his time there by rebuilding the Foot Clan.

** Blitzo fires his gun at Leonardo, his bullet hitting Leo in the spot where Shredder broke off a part of his shell in [[Recap/TeenageMutantNinjaTurtles2003S3E25ExodusPart1 “Exodus"]] that has since healed over.

* LikeASonToMe: Inverted. Michelangelo jokingly calls Millie mom, which causes her to burst into TearsOfJoy over being called a mother.

** The Turtles have been thinking of moving to another lair, with Donnie mentioning an abandoned church in Alphabet City that they took up residence in [[ComicBook/TeenageMutantNinjaTurtlesIDW in the IDW comics]].

** When Loona watches Irma reporting on the Purple Dragons' crime spree, she compares it to the "City at War" storyline where the Purple Dragons went to war with the New York mafia and the Foot remnants in Season 2.

** Ch'rell's ColdOpening narration begins with the final battle against him at the end of ''WesternAnimation/TurtlesForever'', where he attempted the complete and utter destruction of the Ninja Turtles multiverse by destroying the prime universe Turtles from the Mirage Comics before being destroyed by his own upgraded Technodrome.

** Raphael and Donatello bring up Savanti Romero and Drako as additional suspects, who were KilledOffForReal at the end of the [[Recap/TeenageMutantNinjaTurtles2003S4E20ReturnOfSavantiPart1 fourth season]] [[Recap/TeenageMutantNinjaTurtles2003S4E21ReturnOfSavantiPart2 two-parter]] "Return of Savanti" and the third season's Ultimate Drako arc respectively.
** Upon realizing that I.M.P was hired by the Shredder, the Turtles describe Ch'rell in a similar fashion to ''Turtles Forever''.

* EvilPowerVacuum: Ever since ''Turtles Forever'', the Purple Dragons have been attempting to fill the void left by Shredder

* LetsYouAndHimFight: Ch'rell pits the Immediate Murder Professionals against the Teenage Mutant Ninja Turtles as a way of keeping them distracted while he uses Stolas's grimoire for his own evil plans.

** Blitzo introduces I.M.P to the Turtles by singing their theme song from the pilot episode.

** Raphael and Donatello bring up Savanti Romero and Drako as additional suspects, who were KilledOffForReal at the end of the fourth season two-parter "Return of Savanti" and the third season's Ultimate Drako arc respectively.

** Master Khan is mentioned to be in prison for his failed crash of April and Casey's wedding in the GrandFinale "Wedding Bells and Bytes".
** Millie brings up I.M.P's previous encounters with Striker after his attack on Rikers Island makes the news.
** With Stolas's grimoire in the Shredder's clutches, Donatello decides that they should use an Asmodean Crystal in order to enter Hell. Coincidentally, this leads to a news report about the Earth Protection Force capturing Barbie Wire, who is revealed to be in possession of one in "Unhappy Campers".

** Ch'rell first meets Blitzo while the latter is imagining himself in a threesome with Moxxie and Millie like in "Loo Loo Land".
** When Ch'rell hires I.M.P to kill the Turtles for him, he describes his enemies with much of the same dialogue he used when describing the Utroms to Leonardo in "The Shredder Strikes". Fittingly, he also introduces himself as Oroku Saki to Blitzo.

** Blitzo intially objects to Ch'rell suggesting that Loona come with the imps to kill the Turtles because Ch'rell has "no idea what kinda hormonal freaks would drool all over her!" He, Loona, Moxxie, and Millie [[TakeThatAudience glare at the audience]] while Ch'rell [[AudienceWhatAudience has no idea what they're staring at]].
** When urged by Moxxie to keep a low profile so they can preserve TheMasquerade, Blitzo objects by claiming how HumansAreMorons and that D.H.O.R.K.S has yet to come back for revenge. Meanwhile, Loona adopts her human disguise while agreeing with Moxxie.

** Millie comments on how New York looks way better than Los Angeles, which they visited in "Seeing Stars".

** Blitzo fires his gun at Leonardo, his bullet hitting Leo in the spot where Shredder broke off a part of his shell in "Exodus" that has since healed over.
** During Raphael and Loona's fight, Raph taunts Loona by asking if she's had her shots yet, to which Loona replies that she did in "Western Energy".
** In the first episode of ''Back to the Sewer'', the Turtles encounter a possible future where the Utrom, Demon, and Cyber Shredders are at war with each other. This would eventually come to pass in the present, only this time the three Shredders have teamed up.

** When Michelangelo mentions the Garbageman as a possible suspect as to who hired Blitzo, he also references the events of the uncompleted fifth season episode "Nightmares Recycled", which ended with the Garbageman falling into a vat of acid. The Garbageman himself later references how he was originally going to be Hun's conjoined twin.

** Splinter's retelling of the Turtles' origins recaps what was previously seen in "The Shredder Strikes" and "A Better Mousetrap", while also alluding to the deaths of Tang Shen and Yukio Mashimi in "A Tale of Master Yoshi".

** During the elevator ride down the Waldorf Astoria, I.M.P runs into a lawyer named Murphy Lawson, named after Ryan Murphy and Jim Lawson, who works for Eastman and Laird, Attorneys at Law. When Blitzo reveals that he's an assassin, Lawson then asks him to kill a Starbucks barista named [[Series/NinjaTurtlesTheNextMutation Venus]] for [[DisproportionateRetribution getting his order wrong]] before he's interrupted by the elevator stopping at his floor.

** While explaining what he researched about Hell to April and Casey, he brings up how Lucifer Morningstar is a separate entity from {{Satan}}.

** Sir Pentious mentions having been taken in by the Shredders after being defeated by Alastor in the ''WesternAnimation/HazbinHotel'' pilot, followed by Drako, Savanti Romero, and Drako revealing how they were recruited after their deaths.

* TheLegionsOfHell: The Utrom Shredder's new Foot Clan consists of many residents of Hell, ranging from hellborn demons to sinners like him, the other Shredders, Kavaxas and the Vees, the Garbageman, Savanti Romero, and Drako.

** Two Purple Dragon goons named Anton and Owen bear a striking resemblance to Bebop and Rocksteady's human forms. Upon entering Hell after becoming victims of Blitzo, their sinner forms are that of a warthog and a rhinoceros respectively.

** Blitzo's narration during the ColdOpening evokes similar narrations from the 2003 series's cold opens in the first five seasons in addition to the frontispieces from the Mirage comics, complete with Blitzo saying "Let me tell you a story."