Teenage Mutant Ninja Turtles: The Fifth Mutation

 is an American animated action-science fiction television series based on  by and, being developed by TBD. 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 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.
 * Ray Prissono (voiced by TBD) - 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.
 * 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 TBD) - 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 Rat King (voiced by TBD) - 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.
 * 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 TBD and TBD, 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 TBD) - 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.

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:
 * Jennika was originally from the IDW comics.
 * April being portrayed as biracial as a reference to both her being either 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.
 * Turning the one-off 1987 characters Dark Water into the primary antagonists.