* AuthorExistenceFailure: The show suffered from this twice.
** Original lead star Creator/AndyWhitfield was diagnosed with cancer immediately after the inaugural season aired. This necessitates a {{Prequel}} second season to give him recovery time, and when that ultimately didn't happen, he was recast in the final two seasons. He passed away immediately after ''Vengeance'' finished production.
** SFX Lead editor Grant Konfeld passed away sometime before the final season.
* BillingDisplacement: Many actors play prominent characters and yet aren't included (or even [[PromotionToOpeningTitles promoted]]) in the main billing.
** Creator/LesleyAnnBrandt (Naevia), Antonio Te Maioha (Barca) and Craig Walsh-Wrightson (Solonius) in both ''Blood and Sand'' and ''Gods of the Arena''. Ironically, [[TheOtherDarrin Brandt's replacement]] Creator/CynthiaAddaiRobinson gets [[PromotionToOpeningTitles the promotion to the closing credits]].[[note]] There are rumors that Brandt not being promoted is the real reason she left the show. [[/note]]
** Heath Jones (Donar) and Barry Duffiel (Lugo) in both ''Vengeance'' and ''War of the Damned''.
** Creator/JaiCourtney (Varro) in ''Blood and Sand''.
** Jeffrey Thomas (Titus Batiatus) and Stephen Lovatt (Tullius) in ''Gods of the Arena''.
** Pane Hema Taylor (Nasir), Peter [=McCauley=] (Lucuius Caelius) and Hannah Mangan-Lawrence (Seppia) in ''Vengeance''. Taylor was [[PromotionToOpeningTitles promoted]] the following season.
** Gwendoline Taylor (Sybil) in ''War of the Damned''.
* BreakthroughHit: The TV series significantly raised Steven S. [=DeKnight=]'s profile as a showrunner.
* CastTheExpert: For the orgy scenes, a professional New Zealand company that specialises in sexual gatherings was hired. They were told to do whatever they wanted on camera, and anything that was too much for the network would be edited.
* {{Corpsing}}: The infamous BedTrick scene in the episode "Whore" took twelve hours to film, not helped by the fact that Creator/AndyWhitfield and [[spoiler: Creator/VivaBianca]] kept bursting into hysterical laughter while their characters were having sex.
* CreatorBreakdown: In an interview before the premiere of ''War of the Damned'', Creator/ManuBennett lamented his belief that the show could go for one more season (seeing that said season is a CompressedAdaptation, he may have had a valid point).
* DyeingForYourArt: The actors playing the gladiators had a strict boot camp and diet to ensure their physiques. The women had a strict diet and workout too, but obviously not the extent of the gladiator one. However, there are specific examples:
** Liam [=McIntyre=] came onto the series severely underweight from another role, and had to bulk up.
** Creator/ManuBennett actually grew his hair and beard twice for the series.
** The naturally blond Anna Hutchinson had to dye her hair red to play Laeta.
* FakeNationality: Nobody is from any of the areas of the Roman Republic where their characters would have originated:
** Welsh-Australian Creator/AndyWhitfield and Australian Liam [=McIntyre=] play a Thracian, who inhabited south-eastern Europe, beyond the borders of AncientGreece.
** Scottish Creator/JohnHannah plays an Italian.
** Kiwis Creator/LucyLawless, Craig Parker, Creator/VivaBianca and Anna Hutchison all play Italians.
** American Erin Cummings plays a Thracian.
** American (of Italian-Asian descent) Katrina Law plays a Hispanic.
** Part-Maori Creator/ManuBennett plays a Gaul.
** Australian Dan Feuerriegel plays a German.
** Maori Pana Hema-Taylor plays a Syrian.
** Maori Antonio Te Maioha plays a Carthaginian.
** American Nick Tarabay (of Lebanese descent) plays a Syrian.
** Australian Dustin Clare plays a Celt.
** English Creator/JaimeMurray and Simon Merells both play Italians.
** East Indian Creator/LesleyAnnBrandt and African/English Creator/CynthiaAddaiRobinson play a Phoenician.
** Australian Creator/EkaDarville plays an Egyptian.
** Australian Todd Lasance plays historical Italian dictator, UsefulNotes/JuliusCaesar.
** Kiwi Creator/TemueraMorrison plays an Egyptian.
* FakeBrit: Combining most of the above with TheQueensLatin results in this trope.
* FollowTheLeader: The influence of ''Film/ThreeHundred'', ''Series/{{Rome}}'' and ''Film/{{Gladiator}}'' is pretty obvious here.
* InMemoriam: The first episode of ''Vengeance'' had an ending dedication to Creator/AndyWhitfield, the series' original lead. He is honored again in the GrandFinale, this time along with the show's VFX lead editor Grant Konfeld.
* IWantYouToMeetAnOldFriendOfMine: This show shares [[http://itsmorganabitch.livejournal.com/7155.html practically half of its cast]] with ''Series/LegendOfTheSeeker.''
* MethodActing: Creator/CynthiaAddaiRobinson was crying for real during Crixus' death scene, using the death of her father (who had recently passed away from cancer at the time). Creator/ManuBennett, who didn't know how he was going to play the scene, said once she told him what she would be doing, he realized he didn't have to do anything but react to her. The look of support Crixus gives Naevia is actually from Manu to Cynthia.
* TheOtherDarrin:
** Due to the [[YourDaysAreNumbered impending]] AuthorExistenceFailure. Spartacus' original actor, Creator/AndyWhitfield, passed away in September 2011. Liam [=McIntyre=] replaced him as Spartacus in the last two seasons.
** Creator/CynthiaAddaiRobinson replaced Creator/LesleyAnnBrandt as Naevia, who decided not to renew her contract with STARZ due to money issues.
* PlayingAgainstType: To most American audiences, Creator/JohnHannah. Widely known as bumbling brother Jonathan in the ''[[Film/TheMummyTrilogy Mummy]]'' movies, he shows a very dark side in the fifth episode. To a lesser extent, Creator/LucyLawless as his conniving wife. The two actors enjoyed playing against type so much that they both came back to reprise their characters for the upcoming prequel mini-series.
* PromotedFanboy: Liam [=McIntyre=] had been a huge fan of the show.
* RealitySubtext: As mentioned in MethodActing above, Creator/CynthiaAddaiRobinson has just lost her father to cancer prior to filming ''War of the Damned'', making Naevia's grief of losing Crixus in the last two episodes feel genuine.
* ShortLivedBigImpact: The late Creator/AndyWhitfield is considered the star of the show by pretty much everyone despite only appearing in the inaugural season (two if you count flashback cameos in the prequel). Even [[TheOtherDarrin Liam McIntyre]] outright stated upon being cast that he hated the fact that [[TakeThatMe he had]] [[HumbleHero to replace him]].
* SpellMyNameWithAnS: Many fans don't seem to know how to spell Ilithyia's name correctly.
* StarMakingRole:
** Creator/ManuBennett, Creator/JaiCourtney, Creator/LesleyAnnBrandt, Katrina Law, Nick Tarbay, Creator/CynthiaAddaiRobinson, and Liam [=McIntyre=]'s acting profiles began to increase after their appearance on the show.
** Creator/AndyWhitfield got rave reviews for his performance. Sadly, he got diagnosed with cancer and we all know how it ended for him...
* ThoseTwoActors:
** Craig Parker (Glaber) and Creator/LesleyAnnBrandt (the first Naevia) previously starred together in the New Zealand sitcom ''Series/DiplomaticImmunity''.
** Creator/VivaBianca (Illythia) and Hanna Mangan Lawrence (Seppia) both starred in the movie ''X: Night of Vengeance''.
** Creator/CynthiaAddaiRobinson (the second Naevia) and Nick Taraby (Ashur) were both in ''Film/StarTrekIntoDarkness''.
** Creator/ManuBennett once played Marc Antony on an episode of ''Series/XenaWarriorPrincess'', with Creator/LucyLawless of course playing the titular heroine, who in this case was under cover pretending to be Cleopatra and having the historical affair with Marc Antony in her stead.
** Dustin Clare (Gannicus), Dan Feurriegel (Agron), and Nick Tarbay (Ashur) would went on to appear in ''Film/PacificRimUprising''.
** After the show's conclusion, Creator/ManuBennett (Crixus), Katrina Law (Mira), Creator/CynthiaAddaiRobinson (the second Naevia), Nick Tarbay (Ashur), Liam [=McIntyre=] (the second Spartacus), Todd Lasance (Julius Caesar), and Simon Merrells (Marcus Crassus) would all appear in the ''Series/{{Arrowverse}}''.
* WhatCouldHaveBeen:
** Varro was supposed to die in "Mark of the Brotherhood", but Creator/JaiCourtney's friendship and chemistry with Creator/AndyWhitfield led to his death being pushed back.
** "Delicate Things" was initially intended to be largely a flashback episode showing Spartacus's and Sura's relationship from their first meeting until the beginning of the show.
** In "Revelations", Solonius was meant to try to flee from Spartacus and die a coward, but the writers changed their minds due to the actor's good work and impressive physique, leading to Solonius fighting back and dying a warrior's death.
** During Titus Batiatus' death scene, his son Quintus Batiatus was meant to be present. With his dying breath, Titus would request Oenomaus be freed. Quintus would then decide not to honor this last request.
** In "Libertus", when the rebels infiltrate the arena to bring it down, it was planned that Tullius' corpse be found at one point, OR Tullius would have somehow survived, but gone mad and be eating rats in the depths of the arena. Also, the spear that killed Cossutius was meant to have gone into his mouth and out the back of his head, as a fitting KarmicDeath for a rapist.
** The penultimate episode, ''The Dead and the Dying'', was originally meant to be closer to the historical event in which Spartacus would have captured several Romans and forced them to fight each other in gladiatorial combat to honor Crixus, which would culminate in a battle between Ceasar and Tiberius. The writers decided that they couldn't have the second to last episode be nothing but the protagonists sitting down watching other people fight, so it was rewritten so that Spartacus, Gannicus, and the others fought the Romans themselves.
** Mira was originally going to survive "Wrath of the Gods", and would have eventually become Gannicus' lover.
** Agron was planned to die in the ludus massacre instead of [[spoiler: Duro]], but producers realised it would have more emotional impact if it was the latter. This is hilarious considering [[spoiler: Agron is one of the few characters to survive the series]].
** A movie was planned, taking place between ''Vengeance'' and ''War of the Damned'', but producers realised too much would have to be censored to get an NC-17 rating in the US.
** Creator/StephenAmell, Creator/AidanTurner, and ''Series/PrisonBreak'' alumns Creator/WentworthMiller and Creator/DominicPurcell were the ones considered to replace Creator/AndyWhitfield as Spartacus before Liam [=McIntyre=] was cast. A lot of the show's cast would later appear on Amell's own ''Series/{{Arrow}}'' and [[Series/{{Arrowverse}} its spin-offs]], including [=McIntyre=] (as well as both Miller and Purcell, strangely enough).
** Lucretia was supposed to have died in the Season 1 finale along with everyone else. However Creator/LucyLawless proved popular on set and producers loved her performance so much, she was brought back for Season 2. According to Creator/VivaBianca, Illythia was meant to die in the ludus massacre too - but when Creator/AndyWhitfield was diagnosed with cancer and Creator/LesleyAnnBrandt chose not to renew her contract, Steven S. [=DeKnight=] wanted to keep as many familiar faces around to help viewers with the transition.
** Barca was written to be Oenomaeus originally and the brotherly bond with Crixus was intended for him. However Antonio Te Maoiha was only available for six episodes, so they rewrote the character to be Barca, and then had Doctore revealed to be Oenomaeus.
** Steven S. [=DeKnight=] had stories planned to go a few more years, but the network decided to end after Season 3. They told him in advance, so he could wrap up the story.
** Cossutius was going to take a spear through the mouth (which would have been even more {{karmic|Death}}), but the special effects were too costly. So it was changed to the chest.
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