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  • Abandon Shipping:
    • During the beginning of the show, there was a lot of support for Donnie/April. This was due to many fans finding Donnie's crush endearing and him being a borderline woobie. However, near the middle of the first season, he went from attention seeking to what can be considered down right stalking. This is the first thing that caused fans to jump ship. Then, near the end of the first season, he begins to make increasingly stupid decisions. Cue more fans jumping ship. Then, there's the fact that whenever April gets an episode for herself, Donnie's crush comes to the forefront when said episode could have taken a lot of time to develop her character. This caused EVEN more fans to jump ship. To make things worse in the second season, Donnie has a rather inconsistent its all about me attitude (which only seems to be around when April shows up).
      • "The Invasion" made it seem that Donnie finally put aside his crush, but the third season shows the writers' insistence that the love triangle continue. Although, Donnie has been characterized as much less obsessive about his crush now.
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    • A lot of fans jumped the Leo/Karai ship when it was revealed in-universe that Karai is in fact Splinter's daughter out of fear that the mutagen made the Turtles and Splinter genetically related, therefore his blood children and therefore her half siblings. As of "City at War", the introduction of Shinigami has led to another minor migration. Although, a glance at Tumblr will show that Leo/Karai is still very popular.
  • Accidental Aesop: Some fans view "The Croaking" as giving the message, "If you don't like being grounded, run away! You'll even become friends with Napoleon Dynamite!".
  • Alas, Poor Scrappy: The Pulverizer becomes this after he mutates into Mutagen Man.
  • Alternative Character Interpretation:
    • Does April care about Donnie OR Casey on a romantic level at all? Does she not realize what some of her actions towards Donnie implies through his eyes? Did she have a thing for Casey during the second season and backtracked due to the traumatic events during "The Invasion"? Or is she leading BOTH of them on, only to turn them down, because it's the only thing she can control about her life anymore?
      • Her defending Mikey's actions in "The Croaking". Did she really think they weren't that big of a deal? Or was she trying to make amends due to the previous episode?
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    • Is Mikey really as stupid and irrational as he seems? Or is he insecure about being compared to his brothers and being "just" the funny guy and said stupid and irrational actions are just his misguided way of trying to prove himself? explanation 
    • Is Raph's skill with animals just a result of not being good with people? Or is he inherently more animalistic than his brothers and father?
      • Another one would have to be on whether or not he's a Stepford Smiler in the third season due to the events of "The Invasion". Was he able to cope with the situation during season three’s month time skip? Or is he just putting on a brave face because he's the Team Dad now and doesn't want the others to worry to much?
      • There is another interpretation that the fans have for Raph (although this one is at least partially due to shipping). Is Raph's negative attitude towards Donnie's crush (on April) due to his Brutally Honest nature and being realistic over the situation (and not wanting Donnie to get hurt)? Or does he also have a crush on April as well but doesn't act on it because both his brother and best friend are already pursuing her and the comments he makes are meant to dissuade himself as well? Is it just one of these? Or is it all of them?
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    • Are Casey and Donnie Vitriolic Best Buds? Or is all their antagonism towards each other truly out of spite? explanation 
    • Did the Shredder take Miwa to spite Hamato Yoshi? Or did he do it out of atonement for accidentally killing Tang Shen? And on that note, is he doing evil because he knows he crossed the Moral Event Horizon for killing Shen?
      • Considering his Lack of Empathy for everyone else, does his revenge actually extend to the rest of the world for what happened to the original Foot Clan with Splinter and the Hamato Clan being his main targets? Did he mean to let the Earth be destroyed so it's not just Splinter he ends up killing?
    • Was Kraang Subprime brainwashed by Kraang like the other Utroms? Or did he willingly join the Kraang? The fact that he can speak fluent English, has some level of independent thought, and was called a traitor by Bishop points to the latter.
  • Angst? What Angst?:
    • Bradford likes his mutation into Rahzar despite it being much more horrific looking than his Dogpound mutation since it allowed him to regain some of his ninja speed. Subverted in "The Lonely Mutation of Baxter Stockman", where it is shown that while he's more comfortable in his Rahzar form, he still wants to be human again.
    • Because a filler episode comes afterwards, April's reaction to learning she's a human-Kraang mutant comes off as this.
    • Arguably, Ice Cream Kitty. She doesn't seem bothered in the slightest about being transformed into a living dessert.
    • After the much Darker and Edgier "The Invasion", season three completely dropped the plot regarding the Kraang's ongoing invasion and mutation of the Earth in favor of several filler episodes that are either gratuitous Shout Outs to horror films ("Dream Beavers", "Within the Woods", "Buried Secrets"), bizarre episodes mostly focused on humor ("The Croaking", "A Foot Too Big"), or a mixture of both. Absolutely no mention of what's going on in the outside world let alone the missing Splinter or their allies, or Kirby being mutated again is made. Overall, despite the odd darker moment, the show has taken a much more bizarre, lighter approach.
    • In "Annihilation Earth", Casey is excited to have adventures in space despite the fact that the whole planet was sucked into a black hole, including his dad and sister.
    • While it’s not as bad as Casey, Mikey started to get over said incident mentioned above when the Fugitoid offered him hot cocoa.
  • Anvilicious: The moral about not letting insults get to you to the point where Raph is blatantly portrayed as putting his "insult ignoring training" to "good use".
  • Arc Fatigue: One of the biggest complaints about the series, owing to both the abysmal airing schedule and frequent breaks from the plot.
    • Season Three's first eight episodes at April's farm are criticized for taking the action away from the invasion of New York, having too many strange Filler episodes, lasting longer than is probably necessary, and the lack of any significant plot development.
    • The arc of Karai being reunited with Splinter and the Turtles has already been going on from season two to season three, went through several fake resolutions only for a Diabolus ex Machina to make it worse each time (she gets kidnapped again by Shredder, mutated, the retro-mutagen doesn't work on her, she is captured and Brainwashed and Crazy...), and is still going on by the fifth season. Some fans feel it's seriously getting too long by this point. It got better in season four in that she's no longer brainwashed, but she's striking out on her own to dismantle the Foot Clan rather than coming home, which is still more accepted by fans than previous excuses since Karai now has her own crew to interact with whenever she's not interacting with the main heroes.
  • Ass Pull:
    • Michelangelo mixing up a bunch of random chemicals together just so happens to create the cure to the Kraang's mutagen that the Turtles have been looking for.
    • Shredder had the mind control worms injected directly into Karai's brain so she couldn't just cough them up. She does it anyway.
    • In "Annihilation Earth", Earth is sucked into a black hole. In "Beyond the Known Universe", Professor Honeycutt takes the heroes six months into the past which fixes all the damage. However, the real ass pull was how the time travel was executed. Renet, Lord Simultaneous, and the Time Scepter showed up about half a dozen episodes before this, but they were not involved in the process in any way.
  • Author's Saving Throw:
    • Season Three's first few episodes went to go to great lengths to amend the complaints toward Donatello's characterization; "A Foot Too Big" showing him his advances toward April can be seen as creepy and forceful and "Race With The Demon" re-emphasizes his role as The Smart Guy in addition to downplaying his romantic focus on April and instead focusing on his banter and friendship with Casey. "Eyes of the Chimera", "Vision Quest", "Turtles In Time", and "Annihilation: Earth!" are also very brief in their few scenes where Donatello's crush on April is apparent or referenced.
    • After several complaints regarding Mikey's characterization, "Journey to the Center of Mikey's Mind" shows exactly why he acts the way he does. In his mind, he's still a very young turtle no more than six years old and he still hasn't matured yet despite being as old as his brothers.
    • There have been criticisms of how the Shredder is nearly unbeatable in almost every single one of his appearances since even when completely outnumbered and against people who should be even matches against him skill-wise. "Earth's Last Stand" finally features Shredder losing a fight on-screen against Splinter without any sort of claim to victory as he did back in the first season when revealing that he took Miwa and raised her as a weapon against Splinter. And in "Owari", he would finally lose a fight to Leonardo with the penalty for this loss being Shredder's head and life as Leo is very enraged about Shredder killing Splinter and does not hold back this time.
    • Fans questioned why the heroes didn't just take the first piece of the BHG in "The Arena of Carnage" and destroy it. Leonardo himself questioned this in "Earth's Last Stand" after the Triceratons complete the machine. As it turns out, it can't simply be destroyed and needs a combination of fusion and dark matter.
    • Many fans complained when Rahzar got a nasty bridge-dropping at the end of season four, especially since his character has been pushed to the sidelines since season two. He's immediately brought back to life during the fifth season and given much more screentime. Unfortunately, this was subverted as of "End Times", where he got bridge-dropped again and fell to his death. He's never mentioned again afterwards.
    • Both fans and critics have noted the severe amount of Arc Fatigue that had plagued the series in the first four seasons. Instead of following the tight continuity the first four seasons followed, season five has been split into a series of short arcs, thereby quickening the pacing.
    • "Trans-Dimensional Turtles" was criticized in part because of the fact it was a 30-minute episode, which is too short of a time frame to do much with. The fifth and final season features another crossover, but it's a three-part arc rather than a standalone.
  • Awesome Art:
    • The show is one of Nick's most better animated and visually appealing CGI cartoons. The acute eye will notice subtle "blink and you'll miss it" moments about the body language of the characters and facial expressions that really help set the mood for certain scenes. The occasional 2D elements that get thrown in every so often make the show visually fun to look at.
    • Then, there's the series' fight scenes. They flow well, feel realistic, and can be both fun and exciting to watch. One of the best examples would be Splinter and Shredder's fight at the end of the first season.
  • Awesome Music: The theme song and background music in every episode are very well-composed and brilliant in addition to being memorable and melodious.
  • Badass Decay:
    • Xever suffers from this due to progressively making less appearances and declining in effectiveness and being more comedic after Tiger Claw's arrival.
    • Rahzar is getting hit with this, as he's nowhere near as big a threat as he used to be at the beginning of the series, though he's at least rarely played for laughs like Xever.
    • Slash went from beating the Turtles to near death in his debut to getting curb-stomped by Tiger Claw and Zog (as soon as he turns over a new leaf).
  • Base-Breaking Character:
    • Michelangelo is considered by the fans as being either funnier than ever or annoying than ever. He became even more divisive with the fans after "The Croaking". Some fans felt sympathetic towards him in the episode and were happy he gained a friend, others felt like he was acting like a spoiled brat and think the punishment he received at the beginning of the episode should have increased ten fold due to his actions.
    • Casey Jones is divisive among the fans. It became less so as we learned about his personality and motives. The fact that many Apritello shippers jumped the ship around the time of his introduction probably helped. However, some of the fans are turned off by his antagonistic behavior towards Donatello in season three all because he likes the same girl he does. Others are put off by how often Casey seems to shrug off devasating events (such as "Annihilation Earth") in favor of commenting how awesome their adventures are or whining about how there's no action happening to the group at a given moment.
    • Donatello himself became divisive among the fans due to his crush on April. You either think his crush on April is cute or Squick. His crush on April was viewed by fans as cute and even endearing during the early part of the first season before it suddenly stopped being referenced to for a few episodes and then it came back and became extremely flanderized. More focus starts getting put on it and we get to see Donnie makes less than rational choices because of it. Then, there was "Operation: Breakout"; Raph tells Donnie to leave him out of his attempts at impress April (Raph clearly didn't like being used like that and was offering some advice he seemed to think was helpful). So what does Donnie do? He basically goes on a VERY dangerous rescue mission by himself without telling anybody to get April's dad away from the Kraang. Not only that, but he almost gets himself and Mr. O'Neil killed multiple times. All to impress April.
    • Raphael is divisive with the fans due to being a bigger jerk in this series than he's usually depicted. This has cooled off a bit though, thanks to getting Hidden Depths and toning down his behavior in later episodes.
    • The Shredder is divisive among the fans for his personality in this adaptation, where his sole motivation is to kill Splinter. Some love the portrayal and how ruthless and determined he is to the point where he literally stabbed Splinter in the back even though it meant the end of the world, while others feel the show has heavily flanderized his character and miss how he was in the previous adaptations where he had other villainous ambitions in addition to wanting to destroy the Turtles and Splinter.
  • Big-Lipped Alligator Moment:
    • A mildly disturbing occurs in "Fungus Humongus": After Leo gets sprayed with spore and starts seeing his fear, we're all treated to a random scene of all the mushrooms dancing to the Nutcracker Suite. However, it does break the tension briefly of one of the more disturbing episodes.
    • The ending shows one of the mushrooms on Mikey's pizza getting up and dancing.
    • The cheese phone in "The Manhattan Project", the phone itself is used/mentioned in a few episodes after, but the moment in the episode itself is comedic in a very serious moment.
    • Slash's ability to perfectly mimic Leonardo's voice and silhouette.
    • In "City At War", once Splinter mentions Karai’s friend (Shinigami) is working for the Shredder, cue music beat and then Splinter nibbling on a piece of cheese on a stick.
  • Bizarro Episode:
    • Even by this adaptation's standards, "Pizza Face" is just...out there.
    • A close second in weirdness is "A Foot Too Big". To wit: the Turtles find Bigfoot, Bigfoot falls in love with Donnie, and a psycho hunter who talks to his mother's Shrunken Head is after them.
  • Broken Base:
    • The second season seems to have divided the fans. There are those who see it as Growing the Beard and there are others that feel that while the season has some good episodes, it also has a few pacing issues (such as resolving plots too quickly) and too many filler episodes (some of which are very goofy and at odds with the slightly darker tone that the season was going for in its first few episodes).
    • The third season is controversial with the fans due to the recasting of Leo’s VA and temporary dropping of the Kraang invasion of the world plot line in favor of filler episodes with little emphasis on ongoing plots besides Leo's recovery and the Donnie/April/Casey love triangle.
    • There have been complaints that the show could get better mileage out of having more human antagonists instead of what is an almost exclusively mutant Rogues Gallery. Not helped by the fact that almost all human villains eventually get mutated down the line, including those (like Karai) who didn't undergo mutations in any of the previous adaptations.
    • While the fans rejoiced that Bebop and Rocksteady are finally appearing, they are heavily divided over two things. The first is their drastically different character designs. The second thing is the fact that they're completely different characters from the other versions. Basically, instead of the lovable idiots from the 1987 series, Bebop is an eccentric hi-tech thief who speaks in slang and Rocksteady is a Russian arms dealer who is also a collector of antique military weapons and after Shredder's helmet.
    • The reveal in "The Invasion, Part 1" that Irma was really a Kraang spy. Some fans found the twist funny while others hated it because it came completely out of nowhere with no foreshadowing except for one part in the previous episode. It requires a lot of suspension of disbelief to buy that she was a robot the entire time and a lot of die hard Irma fans are clinging on to the theory that the real Irma was replaced by a robot until Word of God proves otherwise.
    • The fact that the Kraang as a whole have seem to have replaced longtime Big Bad Shredder as the main villain of the entire series is divisive.
    • The end of "A Foot Too Big" where after Donnie comes to the realization that he's been too much of a Stalker with a Crush towards April and apologizes, saying he'll lay off and then she kisses him on the lips. some fans are crying foul about the mixed messages April's giving by her response, others are happy for their ship, and still others are just pissed off at the writers/execs for clearly trying to drag out the love triangle.
      • April manages to do it again just two episodes later in "The Croaking" in which she acts as an instigator towards Mikey's bad behavior. Kid trashes the house multiple times (making a mess with thrown around food, wasting said food, AND breaking furniture) in which his brothers understandably get mad and Raph leaves him to clean up the mess. When Mikey runs away from the group April blames every other member but herself, trying to claim the event was caused by mistreatment that was never shown onscreen. She then takes it a step further and unrightfully yells at Raph for being "inconsiderate", despite the fact he had to take up a lot of responsibility after "The Invasion" and was acting as a Reasonable Authority Figure when he decided to make Mikey clean up his mess. All of this and the fact that her words seemed to genuinely hurt Raph has caused... negative reactions to say the least.
    • The show being very Merchandise-Driven and, seeing as that influenced both of the previous TMNT series, that's saying a lot. Every single episode either introduces a new mutant or mutates a previously established character even if they're already a mutant in characters like Bradford's case, and even ones that don't somehow find a way to get a new form or costume in for one of the characters which appear in the toyline a few months later. While not so bad in more story-centric episodes, it also has led to many Monster of the Week filler episodes, most infamously the first third of the third season, which derail the story completely just to bring in yet another mutant. Combine that with the number of times the show has gone on hiatus and it's led many fans to start losing interest.
      • To a lesser extent, it becomes relatively obvious that they try to dress up the Turtles with their various outfits at least once a season (most notably their LARP outfits and Mikey's Turflytle costume) to promote their Environment-Specific Action Figure, which often leads to filler episodes and Big-Lipped Alligator Moment to justify it.
    • Seth Green's voice for Leo. Whereas Dominic Catrambone managed to sound almost exactly like Jason Biggs, Seth Green sounds nowhere near it via being borderline baritone. Some don't mind it while many others do. At the very least, it's given a reason for why it happened in contrast to many other cartoons that change voice actors without the in-universe characters noting the change: The Shredder damaged his vocal cords to the point of being unrepairable.
    • While "Annihilation Earth" was well-received by both critics and fans, there are still some people who feel divisive about the way the episode ended. A portion of viewers feel that the ending was rushed, the Fugitoid's appearance was a blatant Deus ex Machina, and that the show went way too far by destroying the entire world in the span of five minutes and killing off every single recurring character, in a way that some would argue was done for shock value. Others are perfectly fine with the ending and praise the writers for being able to go that far, for adding the Fugitoid to the cast, and for finally moving past the Kraang invasion arc and starting the Triceraton and space arc for season four.
    • April's being angry with the Turtles after they accidentally mutated her dad has caused fans to either turn against her or explain why she's justified in acting that way. Many fans might calm down after "Target: April O' Neil", where she apologizes to the Turtles for acting like they did it on purpose and apologizing for the way she's acted to them.
      • April has been displaying a very self-righteous nature since season two, which has only been getting worse in season three, that many fans find unjustified. Given she's also tied to an extremely obnoxious love triangle and has gotten little character development outside of the love triangle, her standing in the eyes of the fandom is shaky at best.
    • Karai's mutation. Some fans hate it due to the fact that it came up simply to keep her and Splinter apart per the status quo. Others hate it due to it being a large deviation from the comics and other versions since Karai has never been portrayed as a mutant, with some feeling it's a cheap gimmick of adding yet another mutant to the toyline, not helped by the fact that a figure was indeed announced not long after the change happened. Others are fine with it, as long as they feel it can be eventually cured down the line, and a few other like her new form because it's surprisingly cute, and puts her in the same acceptance club that the Turtles and her father Splinter are in.
    • The various hiatuses, especially in season four. Fans are starting to lose their patience and beginning to wonder if the show's even worth waiting for considering the sheer amount of times they happen. It’s not helping the fact is that sometimes only four or three episodes will air before the show takes a break for well over two months. Other fans, however, don't mind the various breaks; given the quality of the show and how much time and effort it takes for each episode, some fans assume the hiatuses are necessary for the sake of ironing out any errors. Said fans also realize that as the show progresses, more characters are introduced, and more fight scenes occur, thus resulting in more time for animation for said scenes and characters. Then, there are the fans who do have a problem with the hiatuses, but put up with them and just binge-watch each season after they're complete. Some fans don't even motive because they just wait for it all to come out on DVD.
    • The death of Master Splinter in the fourth season. A lot of fans were heartbroken and devastated over his death—especially since it's heavily implied that he was Killed Off for Real this time and won't return for season five. Meanwhile, critics praise the writers for taking the show in this direction and not being afraid of changing up the status quo. However, some fans feel indifferent about his death, as this is the fourth time the show has "killed off" Splinter, and said fans find it difficult to get upset over his death when they already experienced the same emotions three times before. It doesn't help that Death Is Cheap in the show, as some fans are already speculating that Splinter will be revived somehow, just like how he was after "Annihilation Earth".
    • The transition to short arcs for the duration of the fifth season. While some fans are pleased that this will prevent Arc Fatigue that has plagued the series since its' beginning, other fans see it as a sign of failure on the writers' part since they've been unable to maintain long story arcs like the 2003 series.
  • Captain Obvious Reveal: Just about every fan guessed at one point that Karai was really Miwa, Splinter's biological daughter. This stems from the fact that Karai has never been biologically related to the Shredder in any adaptation and her status as his adoptive daughter is a relatively new concept for TMNT adaptations (it originated from the 2003 series). Plus, Karai was in the general age range of how old Miwa would be had she survived to the present day. The excessive foreshadowing (for example, having Karai use the name "Harmony" as an alias since "Miwa" means "beautiful harmony") sealed the deal for most fans, thus there was little shock when it was eventually confirmed in "Showdown".
  • Cargo Ship:
    • As per usual, fans jokingly ship the Turtles with their weapons of choice. However, this series has provided multiple new ones.
    • Splinter+The empty broken mutagen canister Mikey called "mom."
    • Raph+Wooden Spoon
    • Leo+Karai's throwing knife.
    • Donnie+Metalhead.
    • Mikey+Smoke bombs.
  • Catharsis Factor: In "When Worlds Collide", Agent Bishop really picked up the Jerk Ass Ball via attacking Mona Lisa and her commander without trying to understand the situation to insulting and blaming her and the Salamandrians for Lord Dregg's attack on Earth. Towards the end, when Mona Lisa decides to stay on Earth to be closer to Raphael, Agent Bishop objects angrily and this time gets his head punched off by Raph in a satisfying manner, promptly shutting him down after behaving like a Jerkass for much of the two-parter.
  • Character Rerailment:
    • One of the most consistent problems that were had with Turtles Forever was the Character Exaggeration the 1987 Turtles went through, save particular quirks, where they were portrayed as being a bit too silly and similar. Their appearances in "The Manhattan Project", "Trans-Dimensional Turtles", "Wanted: Bebop and Rocksteady", "The Foot Walks Again!", and "The Big Blowout" dial back the silliness and portrays them as how they were back in the 1987 series.
    • Some fans view "Race With the Demon" as this for Donnie and Casey. Whether it lasts is up in the air.
    • Donnie receives some Character Development in "A Foot Too Big". After Donnie promises to not bug April anymore and April kisses Donnie, telling him that he's not just "a mutant", he's "her mutant", his more stalker-y tendencies all but disappear, and he reverts back to his early season one persona in regards to her if not more subdued, making the attraction cute again. He does still have occasional moments of jealousy towards Casey, but he noticeably pulls back much more and lets April do her own thing.
    • Despite just being a spirit to test Raphael in "Spirit Quest", Xever is treated more respectfully and as an Arch-Enemy to Raphael that he was back in the first season rather than the joke he became in the second season. And while he doesn't face off against Raphael in "Serpent Hunt", he wins his fight against Anton Zeck via cunning along with displaying the dark wit he had in season one.
      • Taking further in "Meet Mondo Gecko". He's revealed to be Mr. X, Mondo's boss, and on the side to be running an underground mutant entertainment ring.
    • On a meta level, this adaptation does this with their version of Bebop and Rocksteady. Their origins and designs are different, but they're portrayed as closer to their original characterization from the 1987 series as being comical bad guys who can still be a serious threat to the Turtles rather than as the total doofuses they became after Flanderization sunk in.
  • Complete Monster:
    • Kraang Prime is a demented, relentless Utrom scientist and the main antagonist for the first three seasons of the show. After being exposed to mutagen, Kraang Prime developed psychic powers and used said powers to brainwash millions of peaceful Utroms, renaming them all "The Kraang". Seeking to conquer the universe, Kraang Prime used the Kraang to invade or destroy planets before targeting Earth. Kraang Prime then spent thousands of years experimenting on and torturing human beings in an attempt to terraform Earth into another Dimension X. Using New York City as a petri dish, Kraang Prime repeatedly attacked and tried to turn the city into a giant colony of mutants, and eventually succeeded and transported millions of mutated citizens to Dimension X. Kraang Prime later tried to mutate the entire planet with a giant missile full of mutagen; after this attempt failed, Kraang Prime tried one final time to Take Over the World with the remaining Kraang soldiers.
    • Rat King started off as the smug Mad Scientist Dr. Victor Falco. The Turtles first meet him while investigating the disappearance of another scientist, with Falco seeming very friendly, helpful and concerned with his colleague's well being. However it is soon revealed that Falco himself kidnapped his colleague, mutating him into a gorilla creature and is using his mutated DNA to create a serum that gives himself Psychic Powers. After his initial defeat by the Turtles, Falco loses his job and continues his experiments on rats. An accident leaves him blind and deformed, but also grants him the ability to control rats. Falco becomes disgusted with humanity, adopts the name Rat King and seeks to have his rats take over the city by driving the humans away. Rat King also mind rapes Splinter several times, in order to break his spirit and turn him into his slave. After another defeat, Rat King later returns again, kidnaps several civilians, including a couple of teenagers and a small girl, and plans to experiment on them, trying to turn them into human rat hybrids. However, his first attempt results in a creature that is deformed, immobile and in constant pain, but that does not deter him from continuing his experiments. Also, despite his supposed kinship with his rats, he has no problem experimenting on them and is willing to sacrifice them to gain an advantage over one of his enemies. Even after Falco dies, he continues to torment Splinter in a final attempt to drive him insane.
    • Kavaxas, from season 5, is the ruler of the Netherworld who desires to bring about the apocalypse. After he's summoned by Tiger Claw, Kavaxas is forced to work alongside him and the Foot Clan so that they can resurrect the Shredder and defeat the Turtles and their friends. After Kavaxas brings Rahzar back to life as one of his minions, he goes after Hattori Tatsu and kills him before stealing Shredder's helmet. He later attacks Don Vizioso's gang and kills some of his mobsters before stealing the Shredder's heart, all while repeatedly trying to kill the Turtles and their friends. He also wants to eat the teenaged April whole and swallow her soul to gain her Psychic Powers; he does succeed in taking the souls of Tatsu and the Hammer. With both items in his possession, Kavaxas successfully resurrects the Shredder before betraying Tiger Claw and the Foot Clan; Kavaxas proceeds to unleash thousands of spirits onto New York City as he attempts to cause The End of the World as We Know It.
  • Continuity Lock-Out: The first season alone demonstrates this trope due to the fact that episodes build on each other in addition to lacking of Previously On segments (though the opener may explain) and not really explaining things as well as they could for viewers who have missed an episode or are just starting (though Nick.com is kind enough to leave episodes up for a few weeks just in case viewers missed them, though one will need an account to view the episodes).
  • Crack Ship:
    • Donatello/April shippers and Casey/April shippers have been at each other's throats since the first episode. Those who have been annoyed by their behavior have started shipping Casey/Donatello to troll them for their irrational behavior.
    • April/Raphael to a lesser, yet somehow still understandable, degree.
  • Crazy Awesome: Anton Zeck could rival Deadpool in being a looney, unpredictable Dance Battler who never shuts up yet is incredibly good at what he does as well as being lots of fun to watch. Especially after he's turned into Bebop.
  • Creepy Awesome: The Rat King, all the way. Just the way he's able to affect and corrupt Splinter's mind is horrifying enough. And to top it all off, he does it all with the bone-chilling voice of Jeffrey Combs...
  • Critical Research Failure: In "Turtles in Time", the knights from Arthurian times confuse the Turtles for Orcs. Not only are orcs not part of medieval legends from that era, they are not from any real world mythology at all, having been entirely invented by Tolkien long after Medieval times, meaning there is no way the word could have even existed back then.
  • Damsel Scrappy:
    • April seems to keep on becoming the Damsel in Distress despite her alleged kunoichi training. By the middle of season two, it's starting to wear thin on some viewers. "Mutants and Monsters" even pokes fun at the trend by making an illusionary April play the part of a Princess Classic needing to be saved. While she does get captured and even possessed a bit later, she does take a level in badass with her training that is effective enough to the point where her abilities allowed her to at least fight Shredder himself.
    • Kirby has started to become this by the end of the second season, as something always comes up to keep him and April apart for most of the series. There have been two times in the series when the Turtles have finally managed to save him as part of an over-arching plotline only for him to wind up getting in trouble again not long after, both times due to getting mutated. By this point, some fans have lost interest in him and feel that even though he'll eventually be saved, he'll later only be inevitably either captured or mutated once more in time for season four to do the whole thing over again. Indeed, "Annihilation Earth" comes along and he and April are separated again by apparently killing him along with the rest of the planetnote . While he is presumably saved when the end of the world is reversed later, he's given the Chuck Cunningham Syndrome and was not mentioned in season four until "Owari", where he has a wordless cameo at Splinter's funeral.
  • Darkness-Induced Audience Apathy:
    • Due to April constantly losing Kirby O' Neil, fans have found it hard to care whether or not April and her father reunite at all since he'll just be taken out of her hands sometime afterward. While he was presumably saved offscreen in "Earth's Last Stand", he did not appear at all or get referenced in season four until "Owari".
    • The fact that Shredder constantly defeats the Turtles without them gaining a single victory over him has made some fans tired of how the TMNT in this adaptation Can't Catch Up with the Shredder even after four seasons. It's gotten to the point where Shredder has surpassed even the 2003 version (Ch'rell) in being an Invincible Villain who wins almost all the time and can never be stopped.
    • The entire arc about Splinter and Karai, who is really his daughter Miwa, that's been going on since the first season ends up resulting in this because no matter what happens, things always keep them apart and make the both of them more miserable than before, such as Karai getting mutated and becoming Brainwashed and Crazy or Splinter getting badly injured and even killed at one point. To make matters worse, when things finally started to look up as a result of Karai being freed from her control, mastering her mutation, and becoming an ally again, Splinter ends up getting killed for real with no reset this time, putting things through a giant case of Shoot the Shaggy Dog.
    • This trope is part of the reason the fans regard the "Mutant Apocalypse" as arc non-canon to the series; it effectively renders almost everything the Turtles did across the five seasons null as a majority of their friends and family have died and almost everything they've fought for has been wiped out.
  • Designated Hero:
    • The title hero of the third season's Show Within a Show Crognard The Barbarian certainly fits the bill. In one episode, he and his friends meet some mutants who offer them peace and friendship. But because these guys are kind of ugly, Crognard and his friends happily invade their territory and beat them up. He ends up pushing his luck too far and gets his just desserts in "Annihilation Earth".
    • The fifth season's Show Within a Show Space Heroes: The Next Generation is of the same mold with the main character vaporizing people over the flimsiest of reasons. The show actually has the good twins of the characters appear, only to be humiliated by the evil protagonists. They, too, get their comeuppance.
  • Ear Worm: The theme song is very catchy and memorable, which seems to be a tradition in the TMNT franchise.
  • Ensemble Dark Horse:
    • This show's version of Karai has developed a following. Her loyalty to the Shredder/Foot is downplayed, her snarks are hilarious, her design looks attractive, and her Ship Tease with Leo helps (or doesn't).
    • Xever/Fishface is more popular than his partner Chris Bradford/Dogpound/Rahzar due in part to having a more visually appealing, unique fighting style. It probably helps that the audience learns far more about him than they've learned about his partner. Come season five, he has also lasted longer than almost all of the other Foot Clan members in the Shredder's inner circle, the others having either defected or died.
    • Dr. Victor Falco/The Rat King only appears in four episodes of the series, but he's been acclaimed for being the most terrifying version of the character to date, especially thanks to the ever-popular Jeffrey Combs voicing him. The show also got some major points for adapting his dark as hell role in "City at War".
    • Spike and Murakami thanks to being a funny background critter and a Cool Old Guy respectively.
    • Despite starting out as Base-Breaking Character (mostly due to shipping), Casey has since become a fan favorite.
    • Despite starting out as divided when fans found out about the character, Slash is now very well liked due to being portrayed as a cunning, genuine threat who provides interesting tension with Raphael. While his Heel–Face Turn was a bit divisive considering it happened a bit quickly, he nevertheless maintains a following who are pleased with the new direction the character is being taken in, especially after he founds the Mighty Mutanimals.
    • Ice Cream Kitty has developed a following due to being a genuinely adorable mutant kitty that is made out of Ice Cream and has great interactions with Mikey.
    • Tiger Claw quickly became a fan-favorite due to being an all around badass bounty hunter who gave Splinter a good fight. He evolved to become the definitive Breakout Villain of the series and easily the most substantial addition to the mythos introduced by the show.
    • Kraang Sub-Prime is popular for finally giving this show a Kraang in the style of Krang from the 1987 series.
    • Bebop and Rocksteady are popular for being villains from the 1987 series that were reimagined in the series into more dangerous villains with richer personalities than ever before.
    • This show's version of Renet gained a large amount of fans, since she is shown to be a capable fighter who is very adorable to boot.
    • Professor Honeycutt, who has had his fair share of fans since the start of season four.
    • Shinigami, a badass Action Girl who's working with Karai, is popular with the fans due to her design, fighting style, and personality along with how well she and Karai work together.
  • Family-Unfriendly Aesop:
    • In "New Friend, Old Enemy", Splinter teaches Leonardo that victory is more important than fairness. Granted, he's talking about fighting (potentially) to the death, but perhaps they should have clarified that to the kids watching.
    • In "I Think His Name Is Baxter Stockman":
      Splinter: The first rule of being a ninja is, "Do no harm." Unless you mean to do harm. Then do lots of harm.
    • "New Girl in Town" features Splinter deliver a message to Leonardo that leadership is a hard, thankless task, and he should not think otherwise.
    • Some fans cite this as a meta-reason why the creators may avoid the April/Casey pairing or just leave the Love Triangle entirely unresolved: the general message of Donnie and April's relationship would then be "you'll never be loved if you're different" and that... is probably not something you should be teaching kids for a whole myriad of reasons.
  • Fan-Disliked Explanation: A lot of fans regard the "Mutant Apocalypse" three-parter, which was originally intended to feature the final chronological events in the series (according to showrunner Ciro Nieli), as more of an "Elseworld" take on a possible future for the Turtles rather than the canonical future for the series due to how it renders a lot of the series' events and many of the struggles the Turtles have faced pointless. Not to mention the serious continuity errors and the disposal of the main female characters. At least two of the other crewmembers and even Nickelodeon themselves seem to agree with the latter advertising the arc as "a 'Tale' from Beyond" before officially stating it as being another dimension and "alternate possibilities." Brandon Auman even chimed in by saying that it was "for the audience to decide" whether it was an AU or canon, and that it could be regarded as an AU.
  • Fanon Discontinuity:
    • Some fans refuse to watch anything after the first season due to both several controversial twists happening afterwards (like with Irma) and the fact that the first season was the only one that the original crew worked on.
    • If one takes a look at tumblr, they will see that even right after the episodes aired, fans consider the "Mutant Apocalypse" three-parter to be non-canon for a whole number of reasons. Its non-canon status was later confirmed by Nickelodeon.
  • Fan-Preferred Couple:
    • April/Raph ever since the creators released old concept art of the the two dancing together (Raph noticeably had hearts in his eyes and the writers even went so far as to confirm that they were originally going to be love interests). Basically due to Casey being a bit of a perv and Donnie being downright creepy at times support for this pairing has skyrocketed.
    • April/Leo also has quite the following. This is mostly due to April having far more interaction with him than the other Turtles except Donnie. The support for this pairing may increase following the Narmtastic moment below from "Eyes of the Chimera" (which was ironically written by Greg Weisman, who is no stranger to Interspecies Romances).
  • Foe Yay:
  • Fountain of Memes: Suprisingly enough, Raphael has been the source of most of the show's memes.
  • Franchise Original Sin: The Shredder was criticized as being too powerful in spite of the Turtles constantly shaking up their tactics or when he's logically outnumbered, and the Turtles are almost never able to put a major scratch in his plans save for finally killing him in "Owari", making it hard to care about whether or not the Turtles will manage to win any fight that they have with him. These issues with Shredder's character can be traced back to both the 2003 series and the 1990 film, where he managed to surpass the Turtles in combat prowess. However, the former had featured him frequently upgrading himself afterward in an effort to keep up with the Turtles and the latter was outmatched by the Turtles in the sequel.
  • Genius Bonus/Fridge Brilliance:
    • In "I, Monster", the Rat King wears an outfit nearly identical to the ones worn by medieval Plague doctors (long black coat and black wide-brimmed hat). The Bubonic plague was spread (partly) because of fleas being carried by rats.
    • In "It Came From the Depths", Leatherhead grabs Donatello and starts spinning, which is a tactic he later performs on Shredder in "The Invasion". A grab-and-roll is a tactic used by real life alligators to take down their prey.
  • Growing the Beard:
    • While the 2012 series was excellent from the beginning, its tone became more focused and consistent in the middle of the first season (starting with "The Gauntlet"), the arcs that were previously only hinted at or set up became more prominent, and it mostly dropped the Monster of the Week format. Later in the first season, Karai's introduction upshot an interesting dynamic with Leonardo, some new and interesting setpieces were introduced, and the fight scenes and animation becoming far more consistent and fluid. The second season did backpedal, though.
    • While the third season has its issues such as rather boring filler at April's farm, "Spirit Quest" and "Return To New York" have much stronger pacing and have thus far stayed at the central arc (taking New York back from the Kraang), creating a much stronger narrative.
  • Harsher in Hindsight:
    • At the beginning of "Rise of the Turtles, Part 2", Mikey wants to drink some mutagen, but Donnie points out that it may turn him into a pile of goo. Fast forward to "The Pulverizer Returns"....
    • It’s also a fast forward to "Mikey Gets Shellacne" where we see what happens when Mikey does use more mutagen on himself.
    • Any moment between Raphael and his pet turtle Spike becomes this after Spike mutates into Slash.
    • Any moment that Irma is on-screen becomes this after the reveal that Irma is a Kraang in disguise who became April's friend in order to get April to lead her to the Turtles. You can see how everything this character says is a subtle manipulation to earn April's trust in her and sometimes to erode April's trust in others, such as Casey. Every little quirk is a foreshadowing of what this character really is, such as her encyclopedic knowledge of the behaviors of rats, an innocent enough interest for a Perky Goth but also something valuable when tracking Master Splinter. Or the gluten-free diet a Kraang DROID mentions in passing when Irma is the only prominent "human" character to stick to the same diet.
    • The line in the theme song describing Leonardo, "does anything it takes to get his ninjas through", becomes a lot heavier after "The Invasion".
    • In "Alien Agenda", Karai is fascinated by the mutagen since that's where the "monsters" come from. Raph tells her to "lean in for a closer look", which is harsher because of what happens in "Vengeance is Mine".
    • In "The Fourfold Trap", Karai tricks the Turtles and April into thinking the Kraang are back and that's exactly what happened in the next episode.
    • In "Enemy of My Enemy", Karai states that Shredder's vendetta "is going to take us all down". As of "Annihilation Earth", Shredder really has taken down everyone.
    • In "Mutant Gangland", Splinter tells the Turtles that someday he won't be around anymore to remind them of their foibles. This is just a G-Rated way of saying he'll die eventually and the Turtles will have to live without him. By "Requiem", let's just say that "someday" came sooner than expected.
    • Given that "Tale of the Yokai" featured the Turtles realizing that the events in the episode and their part in it were always fated to happen, chief among them Tang Shen's death. While the Turtles buy Splinter some time in "Earth's Last Stand", "Requiem" shows him dying the same way he did in "Annihilation: Earth", implying that he was always fated to die by the Shredder's hands.
    • In "Owari", Leo calls Shredder a demon during the final confrontation. In the next season, they have to deal with an actual demon (Kavaxas) who apparently makes a deal with Tiger Claw to bring Shredder back to life. Granted, this could just be foreshadowing.
    • When the Turtles accidentally mutate Kirby into a mutant bat, Mikey wonders if he would bite April and turn her into a vampire. During the Halloween arc, April along with Casey, Raph, and Donnie are turned into vampires.
    • The Mutant Apocalypse arc has quite a few of these:
      • The mutagen bomb that changed the world is basically what might've happened had the Turtles failed to disarm the Kraang's mutagen bomb in "The Gauntlet" and also brings to mind the incident when the Turtles accidentally scattered mutagen canisters over New York in "The Mutation Situation".
      • Slash claims that his antagonist actions prior to his Heel–Face Turn was because of the mutagen and he "wasn't right in the head", the mutagen bomb causes Leo to suffer a second mutation and spends several years if not decades as a fearsome warlord/gang leader. On a meta example, his secondary mutated form resembles Dark Leonardo's physiology from the 2003 series' Fast Forward season.
      • Throughout the show, Leo and Raph's sibling rivalry was effectively a toned down reflection of Splinter and Shredder's rivalry with Leo as Splinter and Raph as Shredder and Shredder becoming a crime syndicate leader. However, in this alternate future, Leo is the brother who ends up taking Shredder's path of suffering body horror, leading a gang, and even wearing a mask while Raph simply focuses on surviving with whatever family and resources he has left, much like Splinter in "Lone Rat and Cubs".
      • For something that was nothing more than an offhand comment by a filler villain, Don Vizioso's fear of mutant apocalypse is now jarringly accurate.
      • In "The Invasion", Kraang Prime claims he used mutagen on the monkeys which created early humans. The very thing that created the human race is also what ended it.
      • Donatello downloaded his brain into Metalhead, much like how Professor Honeycutt had his brain transplanted into his robot assistant's body. On a meta example, a Fast Forward episode has the Turtles reading a (fake) journal in the future containing information about events in their lives they hadn't lived yet, Donatello's section contains a story about him becoming a disembodied brain and having to be transferred into the body of Cody's robot butler Sterling.
    • In the third season, Leonardo briefly distrusts Slash due to the fact that he'd tried to kill him and his family before while Slash somewhat meekly admits fault and he also notes that the Mutagen messed with his head, which is an excuse Leo doesn't buy. In the "Mutant Apocalypse" three-parter, the Mutagen Bomb both mutated Leonardo and put him in a mutagen-induced rage for decades before he was finally cured of it.
  • He's Just Hiding!:
    • Not too many fans believe that Tokka, who was caught in the blast of an exploding star, perished since the character's alleged death was never shown onscreen. "Tokka vs. the World" reveals that she survived.
    • Lord Dregg. Despite being thrown out of an airlock and frozen alive, many fans believed he'd show up again before the series ended.
    • Triple subversion with the Rat King. Some fans didn't believe that he fell to his death and expected him to show up again. And after being absent from the show for over a year, he does...until we find out that he was Dead All Along and Splinter was merely seeing a hallucination of him.
    • Now that "Requiem" has aired, both Master Splinter and especially Rahzar are getting this treatment. The former has been "killed off" three times already, so a lot of fans are expecting him to be revived or brought back somehow. Meanwhile, the latter presumably drowned off-screen, but considering that he survived having a hockey puck explode in his mouth and getting run over by a train, many fans won't be surprised if he also returns as well. This was subverted in both cases; "Owari" revealed that yes, Master Splinter is dead, was buried, had a funeral, and only his spirit returns. Also, "The Forgotten Swordsman" revealed that yes, Leatherhead really did drown Rahzar. Tigerclaw has to have Kavaxas bring his corpse back to life.
  • Hilarious in Hindsight:
    • Donatello/April and Leonardo/Karai were both ships that only received mere teasing in the 2003 series rather than anything serious. This series takes those teases and makes them officially acknowledged in-universe.
    • Donatello and Casey's friendly rivalry and name calling in the 1990 film all of a sudden becomes a lot funnier now that the two have received Die for Our Ship between those who pair them with April in this series.
    • A scene with The Elevator from Ipanema involves a Suspiciously Similar Song to "Hooked on a Feeling" (Bossa Nova remix), which is especially funny after another unorthodox superhero team made it famous.
    • In the 2003 series' Fast Forward era, the Turtles must fight evil clones of themselves. Donatello's evil clone is the tallest and skinniest of the 4 evil Turtles, much like the 2012 Donatello, while Raphael's evil clone is the shortest reflecting the 2012 Raphael's design being shorter than Leonardo and Donatello, and Michelangelo's evil clone is basically a nincompoop who barely makes sense to reflect the 2012 Mikey's Flanderized stupidity.
    • In "Rise of the Turtles, Part 2", the Turtles find a canister of mutagen. Mikey suggests that they drink it and reasons that if you mutate a mutant, you get a super mutant. That's exactly what happens when Dogpound takes a mutagen bath and turns into Rahzar.
    • Minae Noji voicing Tang Shen in "Tales of the Yokai". In the 2014 movie, she played Karai.
    • Misanthropic comedian Lewis Black voiced a balding man that got mutated into a red bipedal spider with a temper problem. He advanced further with this concept in Disney/Pixar's Inside Out.
    • In "The Gauntlet", Leo refers to the Turtles as Mighty Mutants. Guess who shows up in the third season? The Mighty Mutanimals. Also, they were investigating one of the group's future members, who in this case is Pigeon Pete.
    • Michael Dorn of Star Trek: The Next Generation appears in "Annihilation Earth" as Mozar and this character is the Big Bad for the first half of season four. The last season's Show Within a Show is a parody of Dorn's The Next Generation, which bookends the seasons after the first season parodied the original Star Trek.
    • In "The Manhattan Project", April calls Karai a witch. Following the latter's Heel–Face Turn, Karai partners with witch girl Shinigami.
    • In order to fight Kavaxas, Donatello invents what are basically proton packs. The IDW series actually had an official Crossover with Ghostbusters a couple years before this story.
    • A training simulation has the Turtles riffing on Street Fighter and Mortal Kombat. The following year the Turtles were announced as Guest Fighters for Injustice 2 which isn't just made by the same company that makes Mortal Kombat but also features guest characters from the series.
  • "Holy Shit!" Quotient: "The Invasion" is this. The Kraang successfully invade New York, Irma turns out to be a Kraang Mole, most of the population gets mutated (including April's dad again), Splinter is defeated and left for dead by Shredder, and the Turtles losing their lair (which forced them to hide in the country with Leo getting injured gets adapted from the comics). But this pales in comparison to "Annihilation Earth, Part 2", where the entire world is destroyed thanks to the Triceratons and a backstabbing Shredder.
  • Ho Yay:
    • Mikey and Leatherhead in "It Came From The Depths".
    • Donnie and Casey get quite a few moments in "Race With the Demon" including one where Casey admits to going after the Speed Demon without Donnie in a way that sounds like apologizing for cheating.
    • Bebop and Rocksteady have their share of this. Particularly of note is "Annihilation Earth", where the two of them are shown hugging one another as they're sucked into the black hole. Rocksteady even asks Bebop to "hold him close" right beforehand. There's even more of it in "Half-Shell Heroes" where Rocksteady outright says "I love you, Bebop. Hold me tight!" when they're surrounded by armed Triceratons. Both cases sound almost like an Anguished Declaration of Love.
    • Karai gets this with April a few times as she is dismissive of her but then often switches to being nicer to her and empathizing with Aprils problems.
      • In the fourth season, Karai gains a friend and partner in the form of Shinigami and cares enough about her that even her anger and hate for Shredder isn't enough for her to risk Shinigami's life.
  • Idiot Plot:
    • "Mikey Gets Shellacne" is started by Michelangelo using prototype Retro-Mutagen on himself, which will have the side effect of making him explode due to the incompleteness of it, because he completely ignored the labels telling him not to use it. To a more minor extent, the other characters ignore Mikey thanks to him messing up when he says that Baxter is probably at his lab, which, considering Baxter's personality, actually wouldn't be very far-off. The entire episode ends up resulting in a far more powerful Chris Bradford, who mutated into Rahzar thanks to it.
    • There's also "Mutagen Man Unleashed". Donnie's lust for April combined with her falling out results in Donnie endlessly ranting which at least partially contributes to Pulverizer's insanity. Splinter had the time to teach Donnie that he can't just make April like him, but for some reason neglects to teach him that a romantic relationship between them wouldn't work due to them being different species. Then Pulverizer is somehow able to make his mouth appendage leave the container he's in and drink more mutagen allowing him the strength to escape, no explanation given as to how he managed to get his mouth out of the container he's stuck in or why Donnie didn't notice that his mutagen supply was depleting. The kicker comes in when Donnie tries to defend Pulverizer's actions stating he was only trying to let them reconcile with April. Pulverizer then tells them he wanted April for himself and blames the Turtles for turning him into Mutagen Man when it was clearly his own fault (great, another instance where the Turtles are blamed for something that wasn't their fault, by the perpetrator no less). Even after all this, Donnie still defends Pulverizer's actions and gives his brothers a reason to keep him since he believes Pulverizer's DNA as Mutagen Man might help him discover a cure for him and April's dad. However, by the time a cure is discovered, it was April's DNA that unlocked the answer, not Pulverizer. About the only thing that stopped this from being an avoidable filler episode was Casey's debut.
  • Inferred Holocaust: The Kraang's invasion in "The Invasion" is full of this.
  • Iron Woobie:
    • Poor Splinter. But even though he keeps getting kicked down by life, he refuses to stay down, picking himself up and continuing on.
    • Leonardo is very much this trope. It's clear that being leader is a very thankless job since no matter how many times he proves himself, his brothers only tend to listen to him when they feel like it. Despite that, he does a really good job keeping them united and he's always there to save their shells. His number one priority is to keep his family safe, even if he has to sacrifice himself to do it.
    • On the more comedic side of this trope, we have Mikey, who's basically a punching bag, both physically and verbally for his brothers. It doesn't stop him from being who he is though.
  • Jerkass Woobie:
    • Raphael is this in "Cockroach Terminator". Raph shows that he's clearly afraid of regular cockroaches, but he then has to put up with a mutant cockroach and the other Turtles are absolutely no help since they either make fun of him or don't give him any sympathy.
      • It happens to him again in season two when Spike becomes Slash, hurts his brothers, and has to fight him. The ending where Raph is looking at a chewed up leaf really sends the message that his best friend is gone and has turned into a monster.
    • As of "Showdown", Karai now qualifies, as she is actually Splinter's daughter and has been lied to her whole life by Shredder, and she still thinks that Splinter's the one who killed her mother and wants vengeance.
      • The ending of "The Manhattan Project" shows her eavesdropping on the heroes, where April is in disbelief that Karai's actually Splinter's daughter. Splinter states that Karai might believe the truth one day, but its ultimately her decision.
      • It gets worse for the poor girl once she DOES believe the truth in "The Wrath of Tiger Claw", "Vengeance is Mine", and "The Deadly Venom".
    • Arguably Spike. While he did try and murder the Turtles, he genuinely believed he was helping Raph... it's kind of hard NOT to feel bad for him when Raph calls him a monster.
      • Briefly comes back in the "Battle For New York" due to Leo's distrust and when he doubts himself as leader due to the Kraang forcing the Mighty Mutanimals into surrendering.
    • Baxter Stockman in his more pathetic moments can be this. And it gets worse after his mutation as it drove him over the edge and all he wants is to be normal again.
    • Casey in "Casey Jones vs. the Underworld" when the Turtles laugh at him for losing to the Purple Dragons. Then again, he did underestimate Hun and didn't bother telling the Turtles about him.
    • With all the "shut ups" he endures from his brethren, one can't help but feel a little bit sorry for Dave Beaver.
  • Launcher of a Thousand Ships: Raphael. Dear God, Raphael. He's been shipped with his weapon, a wooden spoon, April, his brothers, Casey, Bradford, Xever, Slash, Karai, Irma, and even characters who haven't even appeared yet like Mona Lisa, Venus, and Ninjara. To make things better he has shown absolutely no romantic interest in any of these characters that he's actually met, effectively making each and every one of these crack pairings. It got to a point where even cleaning supplies were added to this list. By season four, however, Mona Lisa turns out to be the canonical winner.
  • Like You Would Really Do It:
    • Earth is destroyed in "Annihilation Earth". It's brought back five minutes into the fourth season.
    • Nobody believed for a second that Master Splinter and Super Shredder fell to their deaths in "The Super Shredder". The very next episode reveals that they survived, with the former only suffering from a broken leg.
  • Memetic Molester:
    • Both Donnie and Casey towards April.
    • Bigfoot as well.
  • Memetic Mutation:
    • Booyakasha!
    • That which is the way the Kraang speak has become mutated by that which is known as the Internet into what is known as a meme.
    • The term "sadorable" has become extremely popular on Deviantart.
    • A certain preview for "Showdown" shows the Turtles and April having a little dance party. All three dances shown has become a bit memetic. So you know it shows Leo shuffling. Donnie and April, of all dances they could of done, doing the funky chicken. Then Raph's dance, which might be the most memetic of all.
    • "[Insert character name here] confirmed for season two!" To the point where fans will search for the most obscure characters possible to keep the joke going. It'll probably die down once season two actually comes along though.explanation 
    • "I NEVER WANT TO SEE YOU AGAIN!!!"explanation 
    • Buzz buzz. explanation 
    • The costumes the Turtles (and April) wore in the Halloween game featured on the Nick website. Especially Raph's fairy princess outfit.
    • Raphael: KING OF ALL PIGEONS!!!explanation 
    • "[X] on your [Y] if you [Z]."
    • "Bigfoot's got some moves." explanation 
    • Daddy Raphie! explanation 
    • This fanmade ask blog has spanned several. One post created about five at once.
      Raph (pretending to be Donnie): April's like an F5 key— She's so refreshing.
      Leo (pretending to be Mikey): OMG, you guys! Check out this giant gummy bear I found at the landfill! (Starts chewing at it wildly.)
      • Earlier in the same post is Mikey and Donnie acting out a mock fight between Leo and Raph respectively. The funny thing is it's pretty accurate to their relationship/arguments in other continuities.
      Donnie (pretending to be Raph): You're always holding me back, Leo!! You don't understand me!
      Mikey, in reply to the above. (While pretending to be Leo): Uhhh, wait, Raph, I've stopped caring.
      • Earlier still.
      Mikey (pretending to be Leo): I'm Leo. I enjoy fangirling and being serious.
    • Raphael and cleaning products. explanation 
    • The Cheese Phone, truly an emergency!
    • "Don't Casetello me, bro!", "My Casetello vibes are tingling", and its variants to a lesser agree. explanation 
    • Captain Ryan/Captain Dash Coolstar/Leonardo slapping people.
    • How did he build that? explanation 
    • "Raphael is BEST Disney princess" explanation 
    • SAINW, nooooooooo! explanation 
    • Nightwatcher or Riot! explanation 
    • Casey Jones: First psychotic human friend! explanation 
  • Misaimed Marketing:
    • One toy commercial advertising the Mutagen described said ooze as being the "strongest slime in the universe". And then it showed how the Turtles launch the ooze at their enemies. Yeah... it should go without saying why you shouldn't do that...
    • Wingnut has an official action-figure. Hey kids! Wanna play with the grossly mutated father of one of the human characters?
  • Moe: The Turtles are very adorable due to their cute designs, personalities, and voices.
  • Moral Event Horizon:
    • Shredder crossed this when he killed Hamato Yoshi's (this was before he was mutated and started calling himself Splinter) wife, burned his house down, and took Yoshi's daughter Miwa to raise as his own, naming her Karai (meaning "weapon"), blaming Yoshi for murdering her mother, and making Karai hate her biological father. Why did he do all this? It’s essentially because he was jealous of Yoshi and he just kept going.
      • What makes this even worse is that he's outright shown he has not compassion at all for Karai. She's simply a means to an end. Even the fact she genuinely loves him means nothing so long as he can use her to hurt Splinter. The big crossing in this regard comes when he responds to her asking if Splinter is her real father by saying yes and having her locked up. No show of sorrow or upset. No feelings of remorse. He just basically tells her 'yes, I used you as a living tool of revenge' and discards her.
      • Him blaming Splinter for Karai's mutation probably counts as a better example, but for different reasons. Her mutation was more or less entirely his own fault, with Splinter having nothing to do with it. In a way, Shredder actually caring about Karai makes it worse because instead of going My God, What Have I Done?, he uses it as more fuel for his hunger for revenge instead of accepting responsibility for his actions.
      • He most certainly crossed the horizon for good in "Annihilation Earth" when he throws away a chance to save the world AND Karai in favor of killing Splinter through a literal, figurative, and possibly symbolic backstab, which leads directly to the Triceratons sucking Earth into a black hole.
    • Spike at first came off as a Well-Intentioned Extremist because Raph was mad at his brothers. However, he crossed it when he not only ignored Raph's pleas to not hurt the other Turtles, but went after him too.
    • While his first appearance wasn't exactly not crossing it, The Rat King crossed it in "I Monster" where he sicked a mind controlled Splinter to kill the Turtles.
    • Krang of the 1987 series crosses this territory in "Trans-Dimensional Turtles", where he sets bombs in the Earths of the 2012, 1987, and original Mirage Turtles in a plan get rid of the Turtles forever while lying to his cousin, Kraang Sub-Prime, that he was helping them conquer their worlds.
    • Lord Dregg shows how utterly irredeemable he is in "The Evil of Dregg". Having his armada ready to attack the Salamndrain homeworld, he forced Mona Lisa and Sal Commander to betray the Turtles by luring them into a trap. He then reveals to the two he had no intention of sparing their planet, having plotted on eating them the entire time.
  • Narm:
    • Mikey calling Kirby "Wingnut" after he has been mutated into a bat and the Turtles are trying to trap him. This is even lampshaded by Donnie.
    Donnie: You are not giving Mr. O'Neil a monster name!
    • Slash's fingernails can extend to puncture or slash at his enemies. The result isn't as threatening as it is strange.
    • In "Eyes of the Chimera", April experiences Horror Hunger due to having a psychic link to the aforementioned Chimera. Since Leo is the only one around she tries to eat him... but the dialog she's given and Mae Whitman’s delivery makes the whole event sound incredibly like she's trying to make sexual advancements towards Leo. The fact that Seth Green doesn't even try to make Leo sound all that frightened makes it look like he's only halfheartedly shooting her advancements down. Hell, if you take the scene out of context it wouldn't be surprising if you legitimately thought they were a couple and Leo didn't want to let her "eat him" because he has a headache or something.
    • After the Kraang invasion subplot was wrapped up in a scant few episodes of the third season, the impact of seeing the Downer Ending and Splinter's death feels more than a bit cheesy since there is a massive Like You Would Really Do It feel, like it only happened for shock value, considering how the last Downer Ending was so quickly resolved.
    • The same goes for the Karai arc since every time the show comes to a resolution one episode she's back with Shredder, one she's not and tries to make it as dramatic as possible.
    • Some of the names bestowed upon the Turtles' allies and foes by Mikey come off as grating and forced. Mikey coming up with the name "Rahzar" in particular is rather cringeworthy ("rah yourself, you razor-faced dog") and later boasts that "they" call him Rahzar now. Some fans prefer to call the mutants by their human names (particularly Fishface, since Xever Montes is a "Awesome McCool" Name in the first place). Word of God clarified that behind the scenes, the crew calls the mutants by whatever name comes to mind, but as far as official production and credits, the characters are credited by their mutant name (or most current form in the case of Rahzar).
  • Narm Charm: The frog crying in "The Croaking". It's so cheesy, but you can't help but feel upset after it happens.
  • Nausea Fuel:
    • Mikey's shellacne throughout the whole episode of "Mikey Gets Shellacne".
    • Stockman-Fly via the fact that he is part fly and needs to vomit on food before eating it. He also eats garbage.
    • Some of the toppings Mikey used for his home made pizza in "Pizza Face" has a clump of dirt with worms (and it looks like he got it from a trash bin), a rat carcass, and an eyeball.
    • Steranko eating a cockroach. Granted, it makes sense considering he's out of food thanks to the alien invasion, but there was still no need to actually show it. Likewise, Mikey mistakes some of Karai's scales for potato chips and eats them.
  • Never Live It Down: Donnie is never going to live down the Stalker with a Crush tendencies he had towards April before his rerailment in many parts of the fandom.
  • Nightmare Retardant:
    • While there is a certain paranoia factor to the Kraang, the "place" where they speak creates a difficult "place" with the "place" where they are taken in the serious "place". They can however be surprisingly frightening when they drop that. Although this can be made sinister when they want it to: "The Turtles must be eliminated from this place and all other places."
    • As horrifying as the Pulverizer's mutation into Mutagen Man is, there's just something hard to take seriously about his high-pitched voice when he screams "It burns!".
    • Kraang Prime's voice was this for many fans. Perhaps inevitable, considering that they were voiced by Roseanne Barr, who is known as a comedian first and the casting choice was considered pretty strange to begin with.
    • Much of the scare factor from "Fungus Humongous" can be ruined due to the fact that, aside from Leonardo, April, and maybe Casey (if you're a musophobic), the other Turtles' fears and hallucinations are done in a manner too over-the-top or silly to be taken seriously, with Donatello possibly being the worst offender as his hallucinations of April rejecting him is done in the same Animesque, exaggerated style as the rest of the series.
    • In "The Deadly Venom", the situation temporarily becomes hard to take seriously when Leo hallucinates and sees Donnie's head as a pineapple and his bo staff as a fork.
    • Splinter's death via getting stabbed and thrown off a building by Shredder is supposed to be horrific, but Raph and especially April's facial expressions make it a little difficult to take seriously.
    • On some level, the Newtralizer is supposed to be one of the more serious villains in the show. As a Salamandrian assassin, he's a brutal and powerful Walking Armory who's a tough match for the Turtles and has little regard for whether or not he harms innocent people. He's also the one who took Sal Commander's eye. However, every time he opens his mouth and says "Rokka Rokka", the Newtralizer comes off as less of a Knight of Cerebus and more of a goofy reptilian version of Fozzie Bear.
  • No Yay: Rat King towards Splinter, especially in "Of Rats and Men" where he comes off as an outright stalker.
  • Older Than They Think: A few watchers have commented on the apparent "change" for Splinter to train April in martial arts. It's likely most of the commentators are only familiar with her 1987 counterpart, who was essentially always a Distressed Damsel. Otherwise, a few comic series, the 2003 series, and the 2007 film feature April getting trained by Splinter.
  • One-Scene Wonder: The Dracodroid; it's a two-headed robot dragon that's also a lightning-shooting jet!
  • Periphery Demographic: This TMNT adaptation has just as many teenaged and adult fans as it does children.
  • Relationship Writing Fumble:
    • Minor case. While it's undeniable that Raph's dere moments towards his brothers are heartwarming, a few of the ones with Mikey unintentionally came off as something else to some of the viewers. As stated above, it's not nearly as bad as most other examples of the trope despite it having been noticed. This pairing is shipped by some of the fans.
    • Casey and Donnie's rivalry over April sometimes looks more like UST rather than actual rivalry. This has also caused shipping.
      • "Race With the Demon" did. Not. Help. Instead of coming off as two friends getting in an argument over their mutual crush and slowly making up over the course of the episode, it comes off like they're a couple who are getting over the fact that one of them (Casey) cheated on the other (Donnie). The fact that April is entirely unconcerned if annoyed and has a bit of a moment with Raphael makes this even more jarring. Casey and Donnie even argue Like an Old Married Couple and have a good-natured insult game.
    • April with BOTH Raph and Leo on several occasions.
      • For some fans, Raph's distaste of Donnie liking April comes off as jealousy and angst rather than him trying to be a good (if overly blunt) big brother by helping him let go of a crush. They also had a few small moments during the first two seasons. In the third season, April shows no interest in either Casey or Donnie (the fans who are suppose to be her love interests) and even gets annoyed and angry over some of their advances, whereas she'll later be shown acting rather casual with Raph. The aforementioned "Race With the Demon" had April affectionately lean on Raph at the end after both make a crack at the Ho Yay antics of Casey and Donnie. Lastly, there's her blowing up at Raph in "The Croaking" over Mikey, which some fans have said looked like two stressed parents arguing over their... Well, their parenting methods.
      • As for Leo, many fans have said that he has much more natural chemistry with her than Donnie does. They're shown to get along well and seem fairly close. Then "Eyes of the Chimera" came out and fans almost immediately dubbed it "April/Leo: The Episode" as not only do they work together well, but April tries several times to cheer Leo up over their situation, AND this is an episode or so after the Ho Yay-tastic "Race With the Demon". Oh, and the above mentioned "eating" moment in the narm section only added fuel to the fire for some fans.
    • In "Parasitica", while Leo (controlled by the wasp) bit Raph by the arm, Leo bit Donnie close to his neck leaving a bite mark. It doesn't help that according to the Fridge page, Leo might have been aware of what was happening. This was one of the moments, that cause shipping fuel between the two.
  • Rescued from the Scrappy Heap:
    • Leonardo had a tendency to get a lot of reactions ranging from apathy to dislike from fans in previous incarnations due to being what they felt to be a rather boring character. The 2012 version of Leonardo is very popular with the fans due to the show making an effort to showcase him as still learning to be a leader, as he has just started, and the addition of other characteristics (his love of Space Heroes and disobeying Splinter a bit more frequently).
      • In fact, one of this adaptation’s biggest selling points amongst the fandom is "when was the last time you could say Leonardo was your favorite turtle?".
    • In their first appearance in the franchise, Tokka and Rahzar were considered to be Replacement Scrappies for Bebop and Rocksteady. In this adaptation, Tokka gets a large case of Adaptational Badass and Rahzar becomes a fleshed out character with a different backstory and more personality.
    • In Teenage Mutant Ninja Turtles II: The Secret of the Ooze, the Super Shredder form was derided due to dying quickly and anticlimactically, with very few incarnations using the concept afterward. The 2012 version of the form, however, was received more warmly for its very strong showing (helped by the series being able to properly flesh it out) and scary look.
  • Romantic Plot Tumor:
    • Almost every episode featuring April in a big role is going to heavily feature Donatello's obsessive crush on her, and it's gotten to the point where many are tired of it, especially now that Casey Jones is in the picture and making it a love triangle. Season Three seems to be making a conscious effort to alleviate this via downplaying Donatello's crush on the character and giving her an episode with her and Leonardo as the focus characters, which ironically had a Narm scene that may or may not have inspired ships with THEM.
      • The fourth season made a lot of steps towards fixing the tumor. While there are still a lot of Donnie/April vibes in episodes focusing on Donnie and April together, it comes across as a much more natural and cute mutual crush. Donnie completely ditching the Stalker with a Crush tendencies combined with Casey becoming more Heterosexual Life-Partners with Raph than a Love Interest to April certainly help (and the few times Casey still does hit on April, April appears somewhat annoyed at his Casanova Wannabe antics instead of flirting back as in the previous seasons).
    • Leo and Karai's romance can come off as this since the show doesn't even feel like resolving the Karai reunion plot and yet we still get scenes where Leo rambles about how he's obsessed with her and later, he snaps at Donnie for giving up after an extended period of failures to save her.
    • Raphael and Mona Lisa's romance in large part because of how poorly-developed and rushed many fans see it as and since their romance subplot never has a lasting effect on Raphael unless he's in the same room as Mona Lisa.
  • The Scrappy:
    • The Kraang are generally considered the worst antagonists in the Big Bad Duumvirate due to having what's generally considered an annoying dialogue gimmick, writer changes making their ultimate goal unclear and confusing, their tendency to indirectly create most of their enemies undermining most attempts to portray them as a serious threat, and taking up three and a half seasons as the main threat, which most people thought was too long.
    • The Pulverizer is quite disliked for being an obnoxious fanboy whose levels of stupidity range from uncanny to mind blowing.
    • Bigfoot and the Finger star in one of the most unpopular episodes of the entire series and are full of Nausea Fuel and are just plain bizarre additions to the show. It's to the point that nobody on this very website even cared enough about them to add character entries for them until almost a year after they appeared!
    • Hun is hated for being a Bruce Lee Clone with no other characteristics, having almost nothing to do with the previously established character that he's named after, and being superfluous to the narrative, especially since he quickly becomes a minor character in the grand scheme of the series.
  • Seasonal Rot:
    • Many fans of the first season have expressed dislike or disappointment toward the second season. The cause of this occurred behind the scenes, as the writers from season one were all replaced with brand new writers unfamiliar with the show for season two. As a result, it took the new writers a good while to really find their groove, and the results are noticeable. Some plot elements were resolved too quickly while others wound up taking forever, the Turtles, particularly Mikey and Donnie, all went through some Flanderization, several new characters were introduced but many of them were underutilized, and many controversial changes began happening which left fans divided all over the place. That said, the final few episodes do show noticeable improvement and "The Invasion" was particularly well-received, with the exception of the Irma twist.
    • Many fans disliked the third season due to its Arc Fatigue (with the Turtles being stuck at April's farm), the sudden change of Leonardo's VA, and the Romantic Plot Tumor between Donatello, April, and Casey coming back after it was seemingly resolved at the end of the second season. Not to mention the show completely ignoring the Kraang invasion plot. And when it finally did conclude the Kraang invasion arc after this, many felt it came off as a huge Anti-Climax by rushing the whole thing through five episodes, with the invasion aspect itself only being dealt with for two of them.
    • The general consensus is that while the episodes in the fifth season are more streamlined and fairly well-written, the fifth season overall felt directionless as two of the adaptation's principle characters, Splinter and Shredder, had died in the previous season. The episodes themselves were also considered a bit of a mixed bag; while the crossovers with Usagi Yojimbo and the 1987 series were praised (with the former likely finally getting enough interest for the character to headline his own proper Animated Adaptation), most of them were based upon wrapping up plots that nobody was that interested in seeing finished anymore due to their lack of relevance, and more lingering plot points (such as most of the romance subplots) were quietly ignored, with the intended series finale, "Mutant Apocalypse", being contentious for resolving almost nothing in favor of stopping other writers from using this adaptation.
  • Shipping:
    • Donnie and April have been getting this since the first episode. Also, fans started shipping Leo with Karai as soon as the description for "New Girl in Town" was released (just like with the 2003 series).
    • Casey didn't appear until season two, but he got Die for Our Ship from Donnie X April shippers long before his debut.
      • Some fans got so tired of the drama surrounding April, Donnie, and Casey that they disregarded the love triangle completely and began "bro-shipping" Casey and Raph instead.
  • Some Anvils Need to Be Dropped:
    • The second season has a minor theme about not allowing friendships to be ruined. Splinter and Shredder were once the best of friends until they competed for Tang Shen's affections. Saki went as far as to provoke Splinter and instead of trying to mend their friendship, the two allowed their rivalry to become hatred, resulting in Splinter losing everything he loved. Then there's the incident with April becoming upset with the Turtles after they accidentally mutate her father into a giant bat. Casey tells her about how he unintentionally allowed his best friend Nick to hate him after accidentally hurting him, which convinces her not to allow an accident to turn her back on her friends. Had Splinter and Shredder did what April had done and try remain friends after everything, Splinter could have lived a happier life while Shredder could have moved on.
    • "Fungus Humongous" defies the usual "mastering your fear" anvil kids' shows depict. Instead showing that you aren't able to get over your fears overnight, but you can still face your fears. Leonardo doesn't get over his fear of failing his brothers, but he's learned to not let them go over his head.
  • Special Effect Failure:
    • While the adaptation's CGI animation and artstyle are very good, sometimes an acute eye will spot that there's something off about the skyline or the distant buildings.
    • "The Invasion" had it snowing along with generally well-detailed buildings and environments to reflect this with snow covering the buildings in Part 1 and for most of Part 2, but by night-time, the snow disappears from the environment completely, even when it was previously on the buildings and sidewalks.
    • In "Newtralized", at least one scene shows Slash wearing Donnie and Mikey's masks wrapped around his arm. Despite the fact that this occurred in a different episode.
  • Spoiled by the Format:
    • Tiger Claw being added to the opening titles made his supposed death by Kraathatrogon very suspicious to say the least.
    • If you're paying attention to the running time in "Dream Beavers", the fact that the beavers are released with only two minutes to go will probably let you guess that they aren't as dangerous in the real world as they are in dreams.
  • Squick:
    • A birthday cake made out of algae and earthworms.
    • Almost everything about the Spy-Roach in "Cockroach Terminator".
    • In-Universe, the Turtles reaction to the sea monster guarding the Kraang fortress falling in love with their submarine.
    • Depending on whether or not you believe the mutagen made the Turtles related to Splinter by blood the fact that Karai is infact Splinter's daughter may have very well caused this reaction in some fans. Especially since Leo had/has a crush on her and Raph admitted she's hot "in the evil way".
      • The fans who were guessing that this version of Karai and Splinter are related since before the show even aired (due to promotional material) found the Leo+Karai ship gross, especially if they're in the party that believe the Turtles and Splinter are related thanks to the mutagen. The confirmation that yes, Karai is Splinter's daughter has caused several fans to abandon the Leo+Karai ship.
    • Some fans find any mutant+human shipping to be a bit...odd.
    • Concept art notes on the Mousers reveal that their "gut" carries 5 Rat Carcasses. Ew.
    • "The Manhattan Project" reveals that mutagen comes from alien worms and the mutagen has to be milked from them.
    • At the end of "Target: April O' Neil" Mikey takes out a slice of pizza with bugs on it and eats it.
    • A Freeze-Frame Bonus in "Metalhead Rewired" reveals potato chips with flavors such as "Scab N' Sausage", "Menthol", "Salt N' Sweat", and "Mucous & Chives".
    • The pizza that Mikey bakes in "Pizza Face". Just look at it. Understandably everyone was grossed out when Mikey actually ates it.
    • Don Vizioso's atrocious table manners, involving him spitting up an entire meatball that he was eating when speaking to Shredder.
  • Strangled by the Red String: Besides the ongoing Casey/Donnie/April Love Triangle and Leo and Karai's thing, Raphael and Mona Lisa's development was rushed considering they've known each other for about an hour and have spent half that time fighting.
  • Strawman Has a Point: Sure Karai was a little too emotional in her quest to get revenge towards Shredder, but she did have the right idea in attacking his factories and weapon caches in order to cripple his empire and make his schemes weaker in the long run.
  • They Changed It, Now It Sucks!:
    • Believe it or not, the most controversial change is the addition of a third toe on the Turtles. Fans exploded.
    • April being de-aged to a teenager hasn't been taken very well. And as of "Monkey Brains", fans are complaining about her "empathic" ability and Splinter's decision to train her in ninjutsu because of it.
      • The revelation that April is a half-Kraang mutant is already starting to turn some fans off.
    • The replacement of "Cowabunga!" with "Booyakasha!" is not very popular with the fans. This is later lampshaded in the show when Mondo Gecko uses "Cowabunga" as his catchphrase and has a discussion with Mikey and Casey over which catchphrase is better.
    • The decision to make Karai Hamato Yoshi's biological daughter is something that threw the fans off, especially since they saw that plot-twist coming a mile away.
      • Even more controversial for a lot of the fans has been Karai becoming a mutant.
    • Dominic Catrambone replacing Jason Biggs as Leonardo has received some complaints from the fans. Although, it is midgeted by the fact that Catrambone's voice for Leo was almost identical to Biggs' own.
      • Seth Green taking over Dominic Catrambone as Leonardo beginning in season three has sparked a very negative reception from the fans, especially since Catrambone was at least able to mimic Biggs' voice almost perfectly. Green just sounds too different for it to work.
  • Tastes Like Diabetes: Mikey's nightmare in "Dream Beavers" is like this.
  • They Wasted a Perfectly Good Character:
    • Slash, as a villain. In "Slash and Destroy", Slash is without a doubt a villain. In "Metalhead Rewired", he had a very brief (albeit awesome) team up with the Turtles and other mutants against the Kraang. In "Newtralized", Slash is still an enemy of the Turtles, but he shows there are some lines he will not cross like blowing a building when there could be people in the vicinity of the explosion. At the end of the episode, he fights against both the Kraang and the Newtralizer and his grudge against the Turtles disappears when Raph saves him from being crushed by the Kraang walker. What's really jarring is the fact that Slash appears alongside the other villains in the third version of the theme song. He ends up becoming the leader of the Mighty Mutanimals and his character does a complete 180 on his evil traits.
    • April qualifies for this trope. She gets trained as a kunoichi, is now confirmed to be half-Kraang and half-human, is immune to Mutagen, and has empathy/telepathy powers. Although this makes her cliché to some, the writers could have actually done something with it. Instead, everything is completely tossed over. Despite her training, she's kidnapped or placed in danger in almost every episode. The half-Kraang, half-human idea is hardly ever mentioned again. Her immunity is understandable, but her powers make her the source of last-minute solutions to problem. As of the love triangle between her, Casey, and Donnie, she's little more than a plot device that is only there to be kidnapped and ignore Donnie's affections. This is somewhat fixed by the "City at War" arc, where she graduates to full kunoichi and eventually fights Shredder to save Karai. Plus, she gets an episode as the central character.
    • Irma makes her first appearance since the 1987 series to the delight of the fans. There is teasing over when she will finally meet the Turtles and how her interactions with them and Splinter will be like and "A Chinatown Ghost Story" establishes that she may have an unknown, hidden power, which would have made this Irma more fleshed out than the boy-crazy best friend from the 1987 series. Instead, Irma was never real to begin with and was actually a Kraang all along, used solely to find the Turtles' lair and quickly disposed of by Splinter, which rather feels like the writers just gave the middle finger to long-time fans who wanted Irma to be among the supporting cast.
      • It gets even worse in season three, where Kraang Sub-Prime returns, still wearing the Irma mech suit for no apparent reason, not to mention the Kraang having created an army of robot Irmas to fight the Turtles and their allies. Meaning that we see the good guys wailing on and destroying lots of Irma bots and the last shot we see of one is Kraang Sub-Prime's decapitated Irma mech suit's head floating around with a goofy look on its face, basically making it a "Let's Destroy Irma" festival. By now, it doesn't feel like a middle finger so much as the creators of this show seeming having a hatred for the character of Irma and rubbing it in the faces of the long-time fans that this is all they get.
    • Xever has interesting chemistry with Raphael, a unique fighting style among all the ninjitsu-using characters in the series, and is a surprisingly threatening and dangerous planner, which makes season two’s treatment (appearing less often and being played more for humor) of the character disappointing.
    • Mikey, in the eyes of some, due to the show implying that some of his less than intelligent actions being due to feeling inadequate compared to his brothers. He NEVER gets character development from this, nor is it explored at all.
    • Mondo Gecko, to some extent. After his debut episode, there could've been another episode that focused solely on his relationship with Mikey and/or Casey, and the two characters could've easily bonded and went through further development (something which, as stated above, Mikey has been severely lacking). If anything, Mikey and/or Casey could've taught Mondo to defend himself instead of being the Non-Action Guy. Instead, he's cast aside and serves little purpose besides being the Butt-Monkey within the Mighty Mutanimals group.
    • The Newtralizer, despite being in the opening titles for season two onward, only appears in two episodes. Not only is he an assassin and an Evil Counterpart to Leatherhead, but he also has a personal vendetta against the Kraang—again, like Leatherhead—and was out to destroy as many of them as possible. He could've become a backstabbing Enemy Mine for the Turtles and used them to destroy the Kraang, or at the very least could've been a recurring antagonist in season fourth (especially since it's revealed there are other Salamandarians). Instead, he appears in one episode in seasons one and two. When he finally does show up again in season five? He only appears in a two-episode arc, and quickly killed off by the end of it.
    • The Rat King/Dr. Victor Falco qualifies as this due to the fact that he's the most personal enemy of the Turtles and a major threat outside of the Shredder and the Kraang, putting out a lot of interesting story ideas (including possible encounters with his former partner Dr. Rockwell and setting up a battle between the monkey and the Rat King). He only ever appears three times, fell to his death in the third, and then his corpse shows up in a fourth appearance in season fourth, leaving it unlikely he's ever going to return. He also never runs into Rockwell as the Rat King and his relationship with him is thrown out the window from his mutation into the Rat King on, with Splinter taking Rockwell's place as his torture target.
    • The Neutrinos in the 1987 series were fun-loving alien teenagers and one of them, Kala, had an interesting romantic friendship with Michelangelo. In this adaptation, however, the Neutrinos are simply generic Monster of the Week villains with almost no real characterization and zero similarities towards their counterparts from the 1987 series.
    • Hattori Tatsu quickly established himself as a new, competent, very strong villain for both Karai and the Turtles, despite being blind. The show seemed like it was setting up Tatsu to replace Shredder and be an Arc Villain for Karai or a Disc-One Final Boss in general. Instead, he gets killed by Kavaxas in the same episode as his debut, thus eliminating any chance of him returning in season five.
  • They Wasted a Perfectly Good Plot:
    • April being unable to leave the lair when both Shredder and the Kraang are after her is never even implied after it comes up, and only lasts for a few episodes, though she does later mention she spent weeks living with them.
    • As mentioned above, the implication that Mikey feels inadequate when compared to Raph, Leo, and Donnie. This could have been a really good plot with great character development but so far the writer's haven't even touched upon it unless they're trying to make the audience feel bad for Mikey.
    • Rahzar and Tigerclaw strike up a friendship in "Legend of the Kuro Kabuto" via bonding over the fact they both hate Fishface and agreeing to not let their difference in species get in the way. This is never touched on again despite the potential for an interesting Villainous Friendship.
    • "Annihilation Earth" is immediately invalidated by "Beyond the Known Universe", wherein Honeycutt transports the Turtles back in time to a few months before the Earth is destroyed so they can all go on a space-faring adventure hunting for parts of the super weapon before the Triceratons get the parts and use it on Earth again. Not only is the gravity of the Earth's destruction barely explored outside of the first part of the season's opening episode, this could've been the perfect opportunity to use the season to bring back Renet and Lord Simultaneous and have them, along with Honeycutt, be the ones who help send the Turtles back in time.
    • Some fans were disappointed that the 2003 Turtles were left out of "Trans-Dimensional Turtles", a crossover between the 1987 and 2012 Turtles or feel that it shouldn't have just been a standard 30-minute length episode.
    • Mikey is revealed to have never mentally matured past the age of six in season four, but the show never does anything with this nor explain what happened that stunted his mental growth at that age.
    • With its stakes, unrelenting nightmare fuel, and final appearances of several major recurring villains, some fans felt that the Kavaxas arc should've been saved to be the final arc of the fifth season of the show.
    • In "Mutagen Man Unleashed", after freezing Timothy, Donnie promises to him that he'll try to make him human again. However, this plotline was never followed up on, even after episodes that introduced retro-mutagen.
  • Tough Act to Follow: Just like with the 1987 and 2003 series, any TMNT adaptation made after the 2012 TMNT series is going to be disliked by the fans and considered inferior to the 2012 series along with its predecessors.
  • Ugly Cute:
    • The Mousers. They even make cat-like noises!
    • Justin.
    • Pete.
    • The 2012 version of Casey, as opposed to being quite attractive like in the 2003 series.
    • Slash just may count, having those small, creepy eyes and big jaws and spikes protruding out of his body, but yet you still want to pinch his cheeks, if he has any.
    • The mutant mushroom's minions. At least from Mikey's point of view.
    • The Kraathatrogons, who have very catlike faces that, when they're annoyed, turn into maws, which somehow doesn't mitigate how strangely adorable these giant worms are.
  • Uncanny Valley:
    • While stylized like everything else in the show, the Kraang's disguises are droll businessmen whose eyes and mouths scarcely move as if the Kraang are barely trying with their disguises, creating a rather odd and creepy effect.
    • Then there's Mrs. Campbell, who is also a Kraang creation, and only gets creepier during her fight with the Turtles.
    • There's something creepy about the realistic lips that the mutated Pulverizer aka Mutagen Man has.
    • In season one, some of April's facial expressions caused for a wider mouth, such as smiling or screaming. Her lips looked kind of...off.
    • Don Vizioso is a monstrously obese gang lord the Shredder is allies with and he's simply creepy to look at sometimes, especially when his mouth and eyes are wide open as he prepares to inhale a big meatball (that Shredder quickly bisects).
  • Unintentionally Unsympathetic:
    • Michelangelo often hits this due to at least a few occasions of being Innocently Insensitive, refusing to see any of his actions as in any way his fault for the most part, and his comic relief role being played up during fights for their lives. Not helping is the implication that many of the stupid actions he does are the result of him acting out because the rest of the team doesn't treat him seriously. It's meant to make his brothers look like jerks for being mean to him, but as he's often pulled many of these actions at the worst possible times during life-or-death situations which have endangered himself, his family, and his friends, the implication from that would mean he's willing to risk his loved ones' lives just to act out and try and prove a point, which not only winds up making him look like much worse of a jerk, but somewhat of a sociopath as well.
    • Donnie qualifies as this due to his sole motivation for doing many things (in which he should ALREADY be doing out of either the goodness of his heart or because he's legitimately responsible for it) so that April will like him.
    • Raphael qualifies as this earlier in the show's run. This may or may not have been intended given that the fans warmed up to him after his character development.
    • April has been heavily hit with this. In spite of all the crap she goes through, she qualifies as this trope due to her self-righteous attitude and tendency to blame others for things that either aren't their fault or had little control of have made a lot of fans quit feeling sorry for her. When her father is turned into a giant bat, she swears to never see the Turtles again. And while they are looking for Kirby and Donnie working tirelessly to cure him, what is April doing? Going to school vowing to not even think about her father or the Turtles, not even trying to find him or finding a cure. Not helping has been her kissing Donnie and getting him confused about his feelings for her again after he'd managed to put them aside, which has come off as her unintentionally toying with him to some.
    • Karai after "Enemy of My Enemy". While she has a reason to be angry at the Turtles, it doesn't change the fact that she's knowingly and willingly helping the Kraang take over the world just to get revenge on the Turtles. Then, she tries to kill April several times just to take away someone the Turtles and Splinter care about (also because the series implies she's been very envious of April since at least "Karai's Vendetta"). Regardless of the fact that she believes Splinter killed her mother, only a truly evil person would do this.
    • Splinter in regards to his inability to reunite with Karai/Miwa. When Shredder burns down his home, he just assumes Miwa died, never (to our knowledge) thinking of spying on Shredder, does nothing when Shredder says he took her away, and chooses to stay in the Lair instead of fighting Tiger Claw when Karai says they're using tracking devices to find the lair and need to lure him away. A pattern is then soon established in which Splinter will always mope at every downturn in the Karai arc rather than do anything proactive to help, making it difficult to sympathize with him.
  • The Un-Twist:
    • Many fans saw "Showdown"'s twist about Splinter's daughter coming a mile away. The fact that Hamato Yoshi never had a daughter in the other versions and that in the adaptations where she was Shredder's daughter, Karai was always explicitly referred to as his adopted daughter is what made it easy to predict.
    • Absolutely no ONE was surprised that Steranko and Zeck become Bebop and Rocksteady.
  • What an Idiot!:
    • In "Metalhead", Kraang takes control of Donnie's robot and the guys futilely attack it, claiming it has to have some sort of weak spot...completely ignoring the Kraang that's just sitting on its head right out there in the open.
    • The season two premiere has the Turtles (except for Donnie) playing dodgeball with the Kraang communication orb, which Donnie calls them out on. Nothing new for Mikey and Raph, but Leo should've known better. Sure nothing bad came of it but still.
    • A better example would beMikey telling April that it was their fault that her father became mutated, causing her to hate them.
    • Mikey holds the ball even harder in "Mikey Gets Shellacne", since in order to make himself cooler he exposed himself to dangerous experimental retro-mutagen, missing the fact that Donatello put several warnings of how deadly it was on the can since he only looked at the front.
    • A non-lethal example but still worth a facepalm. In "Pizza Face", Mikey tries to take pictures of all the people that are being mind controlled by Antonio. When he's done and checks the camera, all of the pictures consist of his eye, and he thinks the camera's broken, not realizing he was pointing the camera in the wrong direction.
    • Anton Zeck is out running in the middle of the street while invisible where no drivers can see him. No wonder the Shellraiser hit him.
    • In "Vengeance is Mine", Karai finally learns the whole truth between Shredder, Splinter and Tang Shen, which results in her wanting revenge and returning to Shredder's lair by herself in order to pick a fight with Shredder. This is lampshaded by Shredder since he taught Karai everything she knows and can't take him by surprise.
      • In the same episode, Shredder locks Karai in a cage and suspends it above a mutagen vat as bait to turn the Turtles into snakes. Shredder then attacks the chain suspending Karai's cage and is horrified at Karai's mutation.
    • In "Beyond the Known Universe", Raph and Casey are messing around with space weapons and accidentally behead the armory's robot clerk causing security robots to chase them even though they were told touching the weapons is not allowed. Later, April tells Dregg that humans kill insects, making him angrier than he was before and he was already angry enough to begin with and make him swear a vendetta.
  • What Do You Mean, It Wasn't Made on Drugs?: "Pizza Face" is this trope in a nutshell.
  • What Do You Mean, It's for Kids?: For a TV-Y7 cartoon on Nickelodeon, there sure is a huge amount of Family-Unfriendly Violence.
  • Woobie Species: The Kraang when its revealed that Kraang Prime has brainwashed them all.
  • WTH, Casting Agency?:
    • Roseanne Barr being cast as Kraang Prime. It may well have been intentional casting a comedian considering how ridiculous the Kraang are. Oddly enough, she and Gilbert Gottfried play their roles completely straight.
    • Some fans are wondering this about the showing having Kevin Michael Richardson provide the voice the 1987 Shredder for the crossover in the final season. While it's understandable that James Avery, Shredder's primary voice for most of the 1987 series’ run, could not return due to passing away a few years prior, some 1987 fans are wondering why one of his surviving voice actors, such as Dorian Harewood, Townsend Coleman, or Jim Cummings, was not used instead.
  • The Woobie:
    • Poor, poor Kirby. The guy just can't catch a break.
    • April. In season one, the worst thing that happens to her is her dad getting kidnapped. Things get even worse for her starting in season two.

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