Teenage Mutant Ninja Turtles: The Fifth Mutation

 is an American animated action-science fiction television series based on  by and, being developed by Matt Youngberg. It is produced by and Nickelodeon Animation Studios and it airs on  Nickelodeon since June 15th, 2022.

Synopsis
After the defeat and arrest of the Shredder and the reformation of the Foot Clan, the Turtles believe that they know all of their threats when suddenly they discover a fifth turtle, a rebellious turtle known as Jennika as they have to band together to face against new and returning threats.

Main

 * Leonardo "Leo" (voiced by Yuri Lowenthal) - the determined and slightly stressed leader of the Turtles who has gotten used to protecting New York as he soon tries to get used to learning there is a fifth mutation.
 * Raphael "Raph" (voiced by Vincent Tong) - an anger-prone mutant turtle who can sometimes get too violent sometimes as he surprisingly starts to bond the most with Jennika.
 * Donatello "Donnie" (voiced by Max Mittelman) - a nerdy mutant turtle who enjoys building inventions to help the Turtles as he slightly sucks at interacting with the other turtles.
 * Michelangelo "Mikey" (voiced by Zeno Robinson) - a goofy and lighthearted mutant turtle who is happy that he has a sister, although he can sometimes annoy his siblings.
 * Jennika "Jen" (voiced by Haley Tju) - a rebellious mutant turtle who was being hunted down by the paramilitary organization known as Dark Water, slowly starting to bond with her brothers as well.

Supporting

 * Master Splinter (voiced by Keone Young) - an aging mutant rat who was the loyal pet rat of the deceased Hamato Yoshi as he trained the Turtles in multiple martial arts, being willing to train Jennika as well.
 * April O'Neil (voiced by Stephanie Lemelin) - a scientist who has recently taken over TCRI from Baxter Stockman, being a close friend and ally to the Turtles, often helping them out.
 * Casey O'Neil (voiced by Josh Keaton) - a cocky vigilante who has recently married April as he keeps his job as a vigilante, often working with Turtles as well as starting to grow interested in Jennika.
 * Oroku Karai (voiced by Karen Fukuhara) - The Shredder's daughter who helped the Turtles overthrow him as she has reformed the Foot Clan to become a secretive group of protectors, making the Turtles honorary members and occasionally asking the Turtles for help.
 * Chrome Dome (voiced by TBD) - an android designed by the deceased Krang to be the bodyguard of the leader of the Foot as after Shredder's arrest, he takes the role as Karai's own personal bodyguard.
 * Ray Prissono (voiced by Rob Paulsen) - the friendly and jovial owner of Ray's Jumbo Pizza who the Turtles like to shop at as surprisingly he is fine with them being turtles, claiming they are his best customers.
 * Angel Bridges/The Nightwatcher (voiced by TBD) - a former operative of the expanding Purple Dragons who trained under Casey Jones as she realizes that New York needs more justice, becoming a masked vigilante known as the Nightwatcher, being an ally to the Turtles.
 * TBD

Antagonists

 * Dark Water - a mysterious and sinister military organization who has been studying the mutations over New York, wanting to build their own mutant weapons, clashing against the Turtles, consisting of:
 * Director Wesley Knight (voiced by Nick Offerman) - the calm and sinister yet occasionally mad leader of the Dark Water who was responsible for creating Jennika as he wants to get her back no matter what, claiming her to be his "daughter."
 * Alexandra "Alex" Winters/Megavolt (voiced by Erica Lindbeck) - a cocky operative of the Dark Water who wears a high-tech suit that allows her to control electricity itself, being loyal to Director Knight.
 * Dirk Savage (voiced by John DiMaggio) - an anger-prone operative of Dark Water who was mechanically advanced to help fight for Dark Water, being sent to hunt after and capture mutants.
 * The Mutagen Man (voiced by TBD) - one of the Dark Water's initial mutant experiments who went horribly wrong, being a beast made out of pure mutagen but luckily to Director Knight, has no free will of his own.
 * The Rat King (voiced by ) - a flamboyant yet mysterious god-like entity who claims to have existed since the dawn of time itself, clashing with the Turtles, although it is mainly due to him being bored and interested in toying with the Turtles.
 * Oroku Saki/The Shredder (voiced by Stephen Oyoung) - the terrifying former head of the Foot Clan whose clan was ripped from his control thanks to the Turtles as he has been imprisoned for a year, now only wanting one thing after breaking out of prison, to make the Turtles suffer.
 * Khan (voiced by ) - an aging Shredder loyalist who has grown disgusted with Karai's rule over the Foot Clan, breaking Shredder out of prison to try and help him rebuild the Foot Clan.
 * Ch'rell/Irma Langenstein (voiced by Sarah-Nicole Robles) - the sister of the deceased Krang who has grown upset at the death of her brother, wanting to take over Earth in his honor, creating a human disguise known as Irma which she uses to pretend to be a righteous street punk and Jennika's friend, believing that manipulating her is the best path to beginning her eventual plans for Earth's invasion.
 * The Hun (voiced by Matthew Yang King) - the intimidating and brutal leader of the Purple Dragons who has taken over New York's criminal underworld after the Foot Clan's reformation, his schemes often causing him to clash with the Turtles.
 * Simon Bonesteel (voiced by TBD) - a flamboyant big game hunter who sees mutants as the next big prey to hunt after, becoming interested in hunting them down. Eventually, realizing he needs a tactical advantage, he mutates himself into a tiger.
 * Dirtbag and Groundchuck (voiced by Eric Bauza and Kevin Michael Richardson, respectively) - two rather incompetent mutants who want to prove themselves as the best criminals of all time with Dirtbag being a mole that can dig massive holes and likes carrying around a shovel as a weapon and Groundchuck being a mutant bull with cybernetic enhancements.
 * Dreadmon (voiced by Daveed Diggs) - a Jamaican mercenary who mutates into a dire wolf as he enjoys the thrill of fighting strong opponents as he learns of the Turtles and wants to face them in a fight to the end.
 * Armaggon (voiced by TBD) - a loan shark who worked for the mafia who ends up mutating into an actual shark as he grows fascinated with his newfound power, as despite that he keeps his job as a loan shark, knowing his skills will cause him to rise the ranks.
 * TBD (voiced by TBD) - TBD

Episodes
See List of episodes.

Trivia

 * The series' developers have stated their intention of making it a love letter for the franchise by adding several elements from different incarnations while also changing things up and adding new elements as well. Examples include:
 * Much like the 2012 series and Rise of the Teenage Mutant Ninja Turtles, the theme song is an updated version of the 1987 series theme song, played in the style of EDM.
 * Jennika was originally from the IDW Publishing continuity.
 * April is portrayed as biracial as a reference to her alternating between being characterized as white (like most incarnations) or black (like the earlier comics and Rise of the Teenage Mutant Ninja Turtles) in different adaptions.
 * The developers have confirmed that she's Irish American from her mother's side and African American from her father's side.
 * The one-off 1987 characters Dark Water are turned into the primary antagonists.
 * TBD