| No.overall | No. inseason | Title | Directed by | Written by | Storyboarded by | Original release date | Prod.code | viewers(millions) |
| 37 | 1 | "Flushed, But Never Forgotten" | Alan Wan | Dale Malinowski | Kevin Molina-Ortiz | October 12, 2019 (2019-10-12) | 203 | 0.18 |
| "Lair Games" | JJ Conway | Jesse Gordon | Sheldon Vella |
| "Flushed, But Never Forgotten": The Turtles learn a hard lesson in telling the truth when a secret that comes back to haunt them in the form of Splinter's pet goldfish Piebald who was accidentally flushed down the toilet by Leo a year prior and mutated after eating an Oozesquito. "Lair Games": April presents her award-winning documentary about the Turtles' annual summer event: The Lair Games. This year's event, however, takes a surprise turn when Donnie unexpectedly gains ground against the past games' constant champion, Leo, sparking a fierce competition between the two brothers. |
| 38 | 2 | "Man vs. Sewer" | Abe Audish | Dale Malinowski | Alicia Chan | October 19, 2019 (2019-10-19) | 121 | 0.15 |
| "The Mutant Menace" | JJ Conway | Ross Carney & Ron Corcillo | Julia Braid, Jake Castorenaand Matt Humphreys |
| "Man vs. Sewer": The Turtles' lazy river ride through the sewers turns savage when Raph is accidentally separated and left alone. This leads to him trying to survive the sewers and having an encounter with the crab mutant Sando Brothers. "The Mutant Menace": Baxter Stockboy begins revealing the Turtles' existence and turning public opinion against them to make some big money and as revenge. The Turtles' failed attempts to clear their image turn all of New York against them. |
| 39 | 3 | "Turtle-dega Nights: The Ballad of Rat Man" | Abe Audish | Jesse Gordon | Alicia Chan | October 26, 2019 (2019-10-26) | 122 | 0.19 |
| "The Ancient Art of Ninja Hide and Seek" | Sebastian Montes | Ian Busch | Kevin Molina-Ortiz |
| "Turtle-dega Nights: The Ballad of Rat Man": Wanting to live with glory again, Splinter ropes Donnie and Mikey into modifying the Turtle Tank and entering it into a mutant demolition derby run by Big Mama. They face competition from Meat Sweats, Repo Mantis, Hypno-Potamus, and Warren Stone. It gets intense when Big Mama, the Fox Bellhop, the Otter Bellhop, and the Owl Bellhop get involved. "The Ancient Art of Ninja Hide and Seek": To prepare the Turtles for any future threats, Splinter teaches them some stealth training. After that is done, he sends them on a test to infiltrate the Grand Nexus Hotel to steal Gus's dog tags. When they appear to take too long, Splinter sneaks into the Grand Nexus Hotel, steals the Octopus Elevator Operator's outfit, and plans to find the Turtles before Gus, Big Mama, or the bellhops do. |
| 40 | 4 | "One Man's Junk" | Abe Audish | Russ Carney & Ron Corcillo | Chris Luc | November 2, 2019 (2019-11-02) | 123 | 0.10 |
| "Snow Day" | Sebastian Montes | Dale Malinowski | Max Collins & Kai Lynn Jiang |
| "One Man's Junk": Donnie and Mikey try to recover a piece of the Dark Armor from Repo Mantis' scrap yard that he claimed. Though they will have to contend with Repo Mantis first. Meanwhile, Raph and Leo get impatient and check out a bus where they accidentally release Repo Mantis' pet cat Mrs. Nubbins. "Snow Day": The Turtles, April, and Mayhem are spending a snow day together. Meanwhile, Ghostbear has mutated into a mutant polar bear after coming in contact with an Oozesquito that Mikey defrosted. In this form, he uses his intangibility in a plot to ruin April and the Turtles' fun day in the snow by targeting their snowman. |
| 41 | 5 | "Cloak, and Swaggart" | Alan Wan | Jason Meier | Christine Liu | November 9, 2019 (2019-11-09) | 124 | N/A |
| "Jupiter Jim Ahoy!" | Abe Audish | Ian Busch | Alicia Chan |
| "Cloak, and Swaggart": April helps Sunita in New York to search for her stolen cloaking brooch after attending a DIGG concert. They find that it was stolen by Meat Sweats so that he can regain his human form and his hosting job on "Kondescending Kitchen" from a bound and gagged Guy Flambe. Meanwhile, Splinter's plan to take the Turtles on a wilderness survival training backfires when Raph accidentally places the tank on lockdown for 24 hours. "Jupiter Jim Ahoy!": Having gotten bored of Splinter's Lou Jitsu stories, the Turtles head to a convention and meet Marcus Moncrief who portrays their favorite sci-fi movie character, Jupiter Jim. When they go to his apartment, they find that he has started to see the different trapped fans as the aliens that Jupiter Jim fought in the movies and comics where Marcus has become more immersed in his character to the point he thinks he is actually Jupiter Jim. |
| 42 | 6 | "Insane in the Mama Train" | Sebastian Montes | Jesse Gordon | Jake Castorena, JJ Conway,Kevin Molina-Ortiz and Sam Montes | November 16, 2019 (2019-11-16) | 125 | 0.06 |
| With the help of Baron Draxum and the Guardsmen, the Foot Clan begins to move the nearly completed Kuroi Yōroi armor to a ritual site. To transport it, Draxum persuades Big Mama to lend the Foot Clan her train. After training the Turtles following the advice of his ancestors, Splinter trains the Turtles for this fight. |
| 43 | 7 | "End Game" | Abe Audish | Russ Carney & Ron Corcillo | JJ Conway, Chris Luc, Sam Montes,Sam Syzmanski and Sheldon Vella | November 16, 2019 (2019-11-16) | 126 | 0.09 |
| The Turtles have been captured, and Baron Draxum sends April back to have Splinter bring the final piece of the Kuroi Yōroi armor to him or else. As the faceplate is on his teapot, Splinter comes up with a plan to rescue his sons with the help of April, Bullhop, Frankenfoot, S.H.E.L.L.D.O.N, and Todd Capybara. When Draxum reassembles the armor and dons it, the Turtles must find a way to get the armor off of him. |
| 44 | 8 | "Many Unhappy Returns" | Kevin Molina-Ortiz & Sebastian Montes | Ian Busch | Jake Castorena, Alicia Chan, Phil Jacobson,Kevin Molina-Ortiz and Sam Montes | November 23, 2019 (2019-11-23) | 201 | 0.18 |
| Now that the Shredder has been reconstructed, the Turtles must stop this persistent foe from shredding New York. Due to how the Shredder is acting, the Foot Clan retreats to figure out what went wrong. Problems arise when they split up to handle different things. Leo takes Splinter, who has a history with Big Mama, to the Grant Nexus Hotel to enlist her help while April and the Turtle trio work to fight Shredder. Though the condition is that Splinter and Leo must fight a Kraken in the Battle Nexus. |
| 45 | 9 | "Todd Scouts" | JJ Conway | Jesse Gordon | Jules Bridgers, Jake Castorena,Morgan Hillenbrand and Will Ruzika | November 30, 2019 (2019-11-30) | 202 | 0.15 |
| "Goyles, Goyles, Goyles" | Abe Audish | Russ Cadney & Ron Corcillo | Max Collins, Matt Humphreysand Andrew Kim |
| "Todd Scouts": Splinter has gotten fed up with his sons and their phones, so he leaves them in the forest with Todd supervising them. The Turtles need to learn how to listen and get in touch with nature to save Todd after he's captured by a group of dentists that mistook Todd for a Sasquatch. "Goyles, Goyles, Goyles": With Baron Draxum out of commission, Huginn and Muninn look for new work. After getting trapped by Meat Sweats, Huginn and Muninn recall their first day working for Draxum where their first mission is to obtain Lou Jitsu from the Battle Nexus. |
| 46 | 10 | "Breaking Purple" | JJ Conway | Josh Riley Brown | Christine Liu | April 24, 2020 (2020-04-24) | 204 | N/A |
| "Repairin' the Baron" | Alan Wan | Russ Carney & Ron Corcillo | Alicia Chan & Max Collins |
| "Breaking Purple": Donnie's parenting causes S.H.E.L.L.D.O.N. to run away. When he makes his way to the park, he runs into the Purple Dragons who remove the restraining bolt from him and use him in their plans to win the drone races at the Thunder Dome hosted by Billionaire Guy Eccentric and obtain the Shadow Transmitter that would enable them to hack any system on the planet. Now Donatello must work to find S.H.E.L.L.D.O.N. and makeup with him before the Purple Dragons succeed in their plot. "Repairin' the Baron": The Council of Heads will forgive Garm and Freki if they bring Baron Draxum to the Hidden City to answer for his crimes that they assisted in. Raph finds out that April's new neighbor is Draxum, who is still recuperating and has Mikey as his guest. Mikey states that he is helping to get Draxum to tolerate humans as he still was the one who created them. When Mikey drags Raph into helping him by taking him to Albeartoland, they must also contend with Garm and Freki. |
| 47 | 11 | "Air Turtle" | Sebastian Montes | Jesse Gordon | Sheldon Vella | April 24, 2020 (2020-04-24) | 205 | N/A |
| "Pizza Puffs" | JJ Conway | Russ Carney & Ron Corcillo | Mira Ongchua |
| "Air Turtle": Leo gets his dream job as the mascot of the local professional basketball team called the New York Daves owned by Tim Dunkman. Leo finds that the members of the New York Daves are terrible players and talks him into doing whatever it takes to change his mojo. He uses an ancient "good luck" arch called the Arch of Aquinonn that causes the players to become possessed by evil spirits that start to change them into demonic forms. "Pizza Puffs": Raph thwarts Meat Sweats' plans to sabotage his rivals with pizza puffs spiked with a mystic poison. When he finds that they ate the poisoned pizza puffs, Raph teaches his brothers a lesson in responsibility as the poisoned pizza puffs affect them in different ways. Raph must get them to solve things themselves as they track down Meat Sweats to find the antidote. |
| 48 | 12 | "Sidekick Ahoy!" | Jake Castorena | Ian Busch | Jake Castorena | May 15, 2020 (2020-05-15) | 206 | N/A |
| "The Hidden City Job" | Sebastian Montes | Russ Carney & Ron Corcillo | Max Collins |
| "Sidekick Ahoy!": With Marcus Moncrief requires a sidekick for his latest "Jupiter Jim" project, the TMNT do all they can to win their dream job. When Raph wins, he and Marcus work to pursue the villainous Scor-Pion. Meanwhile, the others persuade Red Fox to return to Marcus. "The Hidden City Job": Leo and Señor Hueso help the reformed Capitán Piel on one last dangerous mission. This mission involves obtaining an item from an auction house owned by Big Mama. |
| 49 | 13 | "Always Be Brownies" | JJ Conway | Jesse Gordon | Christine Liu | May 15, 2020 (2020-05-15) | 207 | N/A |
| "Mystery Meat" | Sebastian Montes | Russ Carney & Ron Corcillo | Sheldon Vella |
| "Always Be Brownies": April and Splinter encounter a gang of dangerous middle school brownie sellers at the time when April is selling cookies as part of a fundraiser to save the trees. What they soon discover is that these girl scouts are working for Grandma C.J. who is the alias of the Foot Recruit in her plans to get to world domination. "Mystery Meat": Baron Draxum is up for a lunch person award from the Superintendent of Cafeterias Vivian Slopworth. Thanks to an Oozesquito getting loose, Draxum's mystery meat concoction comes to life and terrorizes April's school by targeting every food there and eating it to grow big. When Michelangelo shows up, Draxum must defeat this creation called Sloppy Joseph without making use of his mystic abilities or endangering the school. |
| 50 | 14 | "Donnie vs. Witch Town" | Abe Audish | Ian Busch | Alicia Chan | June 19, 2020 (2020-06-19) | 208 | N/A |
| "Raph's Ride-Along" | JJ Conway | Russ Carney & Ron Corcillo | Mira Ongchua |
| "Donnie vs. Witch Town": The Turtles, Splinter, and April visit the Hidden City. Always a man of science, Donnie can't accept April going to the witches of Witch Town for mystic help on a science project. They meet Mayor Mira who is holding a Peace Offering Day festival that honors Abigail the Good. Donnie starts to lose his temper and April gets help from Gentry in exchange for helping to catch aged worms for a peace potion to appease The Great Morgan. "Raph's Ride-Along": When he wants to go for a ride-along with the Hidden City Police, Raph is mistaken for a heinous criminal called Heinous Green and is taken to the maximum-security facility. Raph fools the Mud Dogs (consisting of Dastardly Danny, Malicious Mickey, and Loathsome Leonard) he is riding with that he is Heinous Green. Following the breakout, Raph states to the Mud Dogs that has a plan to have them apprehended until they have a run-in with Big Mama and the real Heinous Green. |
| 51 | 15 | "Hidden City's Most Wanted" | Jake Castorena | Jesse Gordon | Christine Liu | June 19, 2020 (2020-06-19) | 209 | N/A |
| "Bad Hair Day" | Sebastian Montes | Russ Carney & Ron Corcillo | Gladyfaith Abcede & Max Collins |
| "Hidden City's Most Wanted": Splinter learns from Mikey that he gave Baron Draxum a cloaking broach to disguise him as Splinter takes them on a tour around the neighborhood. When Draxum's disguised form is taken by a Hidden City police officer as a gift for his daughter Heather, Mikey persuades Splinter into helping to rescue Draxum while having to contend with the Hidden City Police when the disguise is broken. "Bad Hair Day": Leo goes to the Hirsuté Resort and Spa to do a day of relaxation. Unfortunately, it is a private club for those who have hair and is thrown out by a double-sided centaur that works as a resort guard while being sent to the terrible club across the street. Their masseus states that the people in the club have hair and Leo gets a hair serum that gives him hair which gets him the Hirsuté Resort and Spa. Though he starts to sleepwalk when the hair has a mind of its own and starts stealing stuff and now must avoid being caught by the double-sided resort guard. |
| 52 | 16 | "Fists of Furry" | JJ Conway | Ian Busch | Morgan Hillenbrand | July 17, 2020 (2020-07-17) | 210 | N/A |
| "The Clothes Don't Make the Turtle" | Jake Castorena | Jesse Gordon | Alicia Chan |
| "Fists of Furry": Splinter informs his sons about his Lou Jitsu Dojos in New York City. In his alias of Randall, he takes April on one of his inspections and finds out that all of his dojos have been taken over by the Komodo Dojo run by Kristoff van Bradford except for one where its students are not doing a good job with the infamous Lou Jitsu moves. To fend off the Komodo Dojo, Splinter trains April in each of the Lou Jitsu moves including the Seven Vipers move. "The Clothes Don't Make the Turtle": Raphael tries on new suits for the Magic Town House's "Night of a Million Secrets" event as Leo, Donnie, and Mikey try on different outfits as well. When they find that they are already here due to the selfies that were previously taken, they find that Hypno-Potamus was responsible for what had previously happened and were hypnotized by his hypnotic music into trying different clothes from the '80s so that Hypno-Potamus can target the journals that were written by Harry Houdini and learn how to bend reality with them. |
| 53 | 17 | "Battle Nexus: New York" | Kevin Molina-Ortiz & Alan Wan | Dale Malinowski | Max Collins & Christine Liu | July 17, 2020 (2020-07-17) | 211 | N/A |
| Big Mama transforms New York into one big Battle Nexus. Raph, Leo, Mikey, and Donnie are paired up with Ghostbear, Carl Sando, Meat Sweats, and Hypno-Potamus against the Battle Nexus champions Troll, Sprite, Amphisbaena, and Cortex in different challenges. Meanwhile, Splinter, April, Baron Draxum, Todd, the Foot Recruit, and the people of New York are put on a cruise that is surrounded by a mystical barrier within the orb as they work to escape. Even when they beat their challengers, the Turtles will still have to contend with Big Mama's latest champion Shadow Fiend whose identity is someone they'd least suspect. |
| 54 | 18 | "Finale" | Sebastian Montes | Josh Riley BrownIan Busch, Russ Carney & Ron Corcillo, Tony Gama-Lobo and Dale Malinowski (parts 3 & 4 only) | Max Collins (parts 1-2 & 4)Sheldon Vella (parts 1-2)Morgan Hillebrand & Cassey Kuo (parts 2-4)Christine Liu (part 2)Jules Bridgers (part 3)Alicia Chan (parts 3-4)Jake Castorena, JJ Conway & Sebastian Montes (part 4) | August 7, 2020 (2020-08-07) | 212 | N/A |
| 55 | 19 | JJ Conway | 213 |