History Trivia / TeenageMutantNinjaTurtles2003

** In addition to the Turtles' clones and [[AlternateSelf alternate universe counterparts]], Creator/WayneGrayson voiced Metalhead and a random Utrom named Krang, two Triceratons named Gruell and Zed, Creator/GregAbbey voiced the Kappa Tengu and Ernie and Creator/MichaelSinterniklaas voiced a mob lieutenant named Weasel, and Parker (Dr. Abigail Finn's assistant).

** In addition to the Turtles' clones and [[AlternateSelf alternate universe counterparts]], Creator/SamRiegel also voiced Zog, Creator/WayneGrayson voiced Metalhead and a random Utrom named Krang, two Triceratons named Gruell and Zed, Creator/GregAbbey voiced the Kappa Tengu and Ernie and Creator/MichaelSinterniklaas voiced a mob boss named Weasel, and Parker (Dr. Abigail Finn's assistant).

* TheOtherDarrin: Several characters eventually get recast, most notably Leatherhead (F.B. Owens to Gary Lewis).

* ExecutiveMeddling: As mentioned on the introduction, the 5th season got skipped in favor of the Fast Forward season (presumably due to how dark season four got and 4Kids and Playmates fearing how this will affect toy sales). This caused the 4th season to end in a cliffhanger for some time. Playmates was the party that explicitly requested a lighter tone for the series.

* ApprovalOfGod: Despite not being involved with the production of the show outside of being one of the co-creators of the franchise, Kevin Eastman called this show awesome and one of his favorites in a 2020 comic con.

* DiedDuringProduction: In the Mexican Spanish dub, Leonardo's voice actor (Enrique Mederos) died in almost the beginning of the series and he was replaced by Creator/LuisDanielRamirez. The funniest thing in the recasting is Mederos previously voiced [[Manga/CardcaptorSakura Fujitaka Kinomoto]] and Luis Daniel Ramirez voiced his son, Touya.

* ToylessToylineCharacter: ''Back to the Sewers'' is notable for not having a dedicated toyline for it despite the overhaul to the show's design implemented with the season. That said, the overhaul was largely intended to bring it more in line visually with the 2007 film, presumably so that Playmates could use the show to continue to sell toys based off the film, though ultimately the toyline only really continued in the mini-figure line, which led to the Turtles gaining stealth suits during the season. The mini-figure line, which originally only focused on movie characters, eventually brought in the 2003 cast like Hun and the Triceratons.

** In "Reality Check", Creator/WayneGrayson voices both Mikey and Blobboid since the latter is Mikey's alternate universe counterpart.
** The Turtles' actors also voice the Dark Turtles during Season 6.

** At the TMNT 25th anniversary panel Q&A, a fan in attendance asked how they came up with the villain Master Khan from ''Back to the Sewer'', possibly in an attempt to get an offical word on the fan theory that he was named after 4Kids head Al Khan. One of the concept artist for the show that was on the panel answered that Creator/{{Capcom}}'s character designs were a major influence for the visual designs for many of the show's villains.

* PostScriptSeason: The series had wrapped up its main plot in Seasons 4 and 5, before the ''Fast Forward'' {{Retool}} and ''Back to the Sewers'' were aired, both of which had less of an emphasis on arc-based stories and more on [[MerchandiseDriven selling toys]], although the latter finally married [[OfficialCouple April O' Neil and Casey Jones]].
* RecursiveAdaptation: The series spawned a short-lived comic book adaptation.

* SimilarlyNamedWorks: Season 7, subtitled ''Back to the Sewers'', and has no relation to the second ''TMNT'' Game Boy game ''Back from the Sewers''.

** At the TMNT 25th anniversary panel Q&A, a fan in attendance asked how they came up with the villain Master Khan from ''Back to the Sewers'', possibly in an attempt to get an offical word on the fan theory that he was named after 4Kids head Al Khan. One of the concept artist for the show that was on the panel answered that Creator/{{Capcom}}'s character designs were a major influence for the visual designs for many of the show's villains.

** Though all replies have been lost to the ravages of time, 4Kids' YouTube channel around 2009 answered fan questions, one of which noted that while Serling's fate went unaddressed in the show proper, he ultimately found his stay in the present worth it due to getting to witness Casey and April's wedding.

** Three of the Shredders in this series are voiced by the same person, Creator/ScottieRay. The Utrom Shredder, the Tengu Shredder, and the Cyber Shredder. There's an in-universe reason for this however; the Tengu Shredder is the original Oroku Saki from ancient Japan, whom the Utrom Shredder, Ch'rell (the main BigBad of the series) based his human persona on, and the Cyber Shredder is a virtual manifestation of Ch'rell combined with Viral.

** "The Christmas Aliens" was released on the DVD "Michelangelo’s Christmas Rescue" 2 months before it aired.
** Various episodes from season 4[[note]]Cousin Sid, The Dragon's Brew, I, Monster, Bad Day and All Hallow's Thieves[[/note]] were released on the [=DVDs=] "Shredder's Final Countdown" and "Mutants & Monsters" anywhere from a few weeks to a couple months before they aired.

** For a longest time, the series was available only in inconvenient, out-of-print DVD season sets (season 3 in particular was a headache to obtain simply because it never received its own individual season set, just seven single DVD sets with episodes shuffled out of order. What’s worse is that the [=DVD=]s also have episodes from season 4 mixed in), available in incomplete forms (''WesternAnimation/TurtlesForever''), or not available at all (''Back to the Sewer''). Paramount and Nickelodeon started releasing [=DVD=]s -- but they only collected random episodes and arcs before being discontinued. Thankfully, as of May 15th, 2023, the whole series is now available to purchase (and in glorious HD) over on Website/{{Youtube}}, iTunes and Amazon Video; plus you can stream it over on Creator/ParamountPlus.[[labelnote:*]]And Amazon Prime Video should you have a Paramount+ membership[[/labelnote]]

* PostScriptSeason: The series had wrapped up its main plot in Seasons 4 and 5, before the ''Fast Forward'' {{Retool}} and ''Back To The Sewers'' were aired, both of which had less of an emphasis on arc-based stories and more on [[MerchandiseDriven selling toys]], although the latter finally married [[OfficialCouple April O' Neil and Casey Jones]].

* SimilarlyNamedWorks: Season 7, subtitled ''Back to the Sewer'', and has no relation to the second ''TMNT'' Game Boy game ''Back from the Sewers''.

** In "Reality Check", Wayne Grayson voices both Mikey and Blobboid since the latter is Mikey’s alternate universe counterpart.
** The Turtles’ actors also voice the Dark Turtles during Season 6.

** Three of the Shredders in this series are voiced by the same person, Scottie Ray. The Utrom Shredder, the Tengu Shredder, and the Cyber Shredder. There's an in-universe reason for this however; the Tengu Shredder is the original Oroku Saki from ancient Japan, whom the Utrom Shredder, Ch'rell (the main BigBad of the series) based his human persona on, and the Cyber Shredder is a virtual manifestation of Ch'rell combined with Viral.

* DiedDuringProduction: In the Mexican Spanish dub, Leonardo's voice actor (Enrique Mederos) died in almost the beginning of the series and he's replaced by Creator/LuisDanielRamirez. The funniest thing in the recasting is Mederos voiced previously [[Manga/CardcaptorSakura Fujitaka Kinomoto]] and Luis Daniel Ramirez voiced his son, Touya.

** At the TMNT 25th anniversary panel Q&A, a fan in attendance asked how they came up with the villain Master Khan from Back to the Sewers, possibly in an attempt to get an offical word on the fan theory that he was named after 4Kids head Al Khan. One of the concept artist for the show that was on the panel answered that Creator/{{Capcom}}'s character designs were a major influence for the visual designs for many of the show's villains.
** Though all replies have been lost to the ravages of time, 4Kids’ YouTube channel around 2009 answered fan questions, one of which noted that while Serling’s fate went unaddressed in the show proper, he ultimately found his stay in the present worth it due to getting to witness Casey and April’s wedding.

** For the twentieth anniversary, the entire series plus ''Turtles Forever'' is finally a complete series [[https://www.moviezyng.com/teenage-mutant-ninja-turtles-2003--the-ultimate-collection-dvd9-dvd-michael-sinterniklaas/810134941243 DVD]][[https://www.amazon.com/gp/aw/d/B0C8PQQ8G8/ box set]].

** For the twentieth anniversary, the entire series plus ''Turtles Forever'' is finally a complete series [[https://www.moviezyng.com/teenage-mutant-ninja-turtles-2003--the-ultimate-collection-dvd9-dvd-michael-sinterniklaas/810134941243 DVD box set]].

* KeepCirculatingTheTapes: For a longest time, the series was available only in inconvenient, out-of-print DVD season sets (season 3 in particular was a headache to obtain simply because it never received its own individual season set, just seven single DVD sets with episodes shuffled out of order. What’s worse is that the [=DVD=]s also have episodes from season 4 mixed in), available in incomplete forms (''WesternAnimation/TurtlesForever''), or not available at all (''Back to the Sewer''). Paramount and Nickelodeon started releasing [=DVD=]s -- but they only collected random episodes and arcs before being discontinued. Thankfully, as of May 15th, 2023, the whole series is now available to purchase (and in glorious HD) over on Website/{{Youtube}}, iTunes and Amazon Video; plus you can stream it over on Creator/ParamountPlus.[[labelnote:*]]And Amazon Prime Video should you have a Paramount+ membership[[/labelnote]]