The fourth season of Teenage Mutant Ninja Turtles began airing on Nickelodeon on October 25, 2015. The season was ordered on June 17, 2014.[2]
The four final episodes originally aired in South Korea during mid- and late-December 2016.[3] This is the only season of the series that has aired over traditional two standard TV seasons, as well as the only season of the series where the 2-part finale aired in separate weeks.
After the Turtles, April, and Casey are saved from the destruction of Earth, the Fugitoid uses his spacecraft the Ulixes to turn back time to six months earlier in order for him and the Turtles to prevent the Triceraton Empire led by Emperor Zanmoran from assembling the three components of the Heart of Darkness that are scattered throughout the universe before everything on Earth is lost. Besides fighting the Triceratons, the Turtles also face new enemies in outer space like Lord Vringath Dregg of the planet Sectoid 1 and the bounty hunter Armaggon. The turtles also meet new allies, Commander G'Throkka (Sal Commander) and Lieutenant Y'Gythba (Mona Lisa), and even have an adventure with their interdimensional 1987 series counterparts and their enemy Krang who is an exiled relative of Kraang Subprime. Despite the efforts of the Turtles, the Triceratons are still able to collect all three pieces of the Black Hole Generator, only for the Turtles to return to Earth and join forces with their past selves to warn Splinter before he is killed by Shredder, stop the detonator of the Heart of Darkness, and defeat the Triceratons. The Fugitoid destroys the Black Hole Generator near the Triceraton space fleet, causing it to explode, presumably killing the Triceratons. In the aftermath of the fight against the Triceratons, the past versions of the Turtles, April, and Casey leave Earth with the past Fugitoid in the Ulixes while the present Fugitoid's head reactivates in Earth orbit.
At one point during their adventures throughout the cosmos, April is given a fragment of the ancient Aeon's mystical Sol Star (containing the very essence of power and life itself), and which helps her in further developing her psychic abilities as well as drastically increasing them to incalculable levels; also due to the several training sessions she had with the Fugitoid.
Weeks later following the Triceraton Invasion being thwarted and the Foot Clan's disappearance, April is promoted to kunoichi at the time when the witch Shinigami arrives and it is revealed Karai is back, She was her friend before brain worm was vanished and intends to rebuild the Foot Clan and dispose of Shredder who is still recuperating from his last fight with Splinter. While Karai and Shinigami have some ninjas on their side, the Foot Clan strengthens the Footbot army by creating the Elite Footbots. Furthermore, some other crime organizations have been plotting to take over the Foot Clan's territory, and a crystal fragment of immeasurable mystical power (which April had received from an ancient benevolent race of aliens known as the Aeons) is beginning to exert quite a baneful influence on her. However, she eventually succeeds in overcoming its vast mystical power and shatters it. She then apologizes to her friends for not disregarding the universal influence the Sol Star fragment had on her, but assures everyone that she now has a better understand of how to control her increasingly powerful psionic abilities on her own.
Using a special mutagen formula, Oroku Saki recuperates and becomes the Super Shredder in order to take back control of the Foot Clan from Karai, finish off Splinter and the Turtles, and even goes far enough to inject more unstable mutagen into himself. He ends up killing Splinter by stabbing him and throwing him off the building. Super Shredder is thrown into a garbage truck to be left for dead by Casey and April. However, he survives and begins to hunt the Turtles once again. Having had enough, the Turtles decide to end the long feud once and for all. After many obstacles, the Turtles face against Shredder, and Leonardo ends it by killing him.
With Splinter avenged and Shredder dead, the Turtles and their friends wonder about what lies ahead. Knowing the Foot isn't over yet and there are still enemies out there, the heroes prepare for the road ahead, knowing that Splinter is still with them, in spirit.
After appearing in the two-part season 2 episode, The Manhattan Project, the 1987 series counterparts of the turtles also had a crossover episode with the turtles from the 2012 series in the "Trans-Dimensional Turtles" episode.[4] In addition with Cam Clarke, Rob Paulsen, Townsend Coleman and Barry Gordon reprising their roles as the 1987 series Leonardo, Raphael, Michelangelo and Donatello, respectively, from the episodes, Pat Fraley also reprises his role as Krang from the 1987 series.[4]
The Turtles are captured and thrown into the Triceratons' battle arena. Their only chance of escaping is teaming up with a convicted traitor while April and Casey work with the Fugitoid to free them.
The Turtles are transported to a parallel universe, where they meet their counterparts, and together they battle Krang and Kraang Subprime.
Weeks after the Triceratons were stopped, the Turtles now celebrates April's full transition as a kunoichi. They find out Karai has returned and brain worm is gone because she vowed to restore the Foot Clan and undo the damage the Shredder has done to the Clan with the help of her old friend from Japan, Shinigami. It is revealed that Shredder is alive but gravely injured from the previous episode who now uses mutagen provided by Stockman to speed up his recovery and to further increase his strength.
When Leonardo secretly allies himself with Karai who now has Foot Soldiers of her own he gets himself into deeper danger than he could have realized, such as Donatello getting injured from explosives and the Turtles and Karai close to death in the Foot Soldier Factory. In the end Karai no longer wants to go after Shredder's belongings but she wants to go after Shredder himself.
Donnie experiments with April's crystalline fragment of the mystical Sol Star (which she is becoming quite obsessed with, due to its mighty power further developing and rapidly advancing her innate psychic/extrasensory abilities to tremendously dangerous power-levels), but accidentally supercharges it with electricity that stirs sudden sentience and autonomy in the crystal fragment. It then uses this to bring four of the main characters from Mikey's favorite comic book to life.
For the first time, the Turtles encounter something they cannot defeat - the Super Shredder! Now far stronger and more vicious than ever, Shredder has returned to put an end to Splinter and the Turtles once and for all. He captures Karai and challenges Splinter to another duel to the death. Meanwhile, the Turtles and April have to deal with Tiger Claw, Rahzar, and Fishface.
In the Undercity, the duel between Splinter and Super Shredder begins to heat up; particularly when Shredder's right arm begins to go out of control as a dangerous side effect of the highly unstable mutagen dosages Stockman-Fly had warned him of. The Turtles, April and Karai show up to assist Splinter, but are held up Chrome Domes. As Super Shredder prepares for the final blow, Splinter throws a knife at some smoke bombs, which causes the ledge to crumble and collapse, resulting in the longtime rivals to fall 1,000 feet into the abyss below; presumably to their deaths.
The Turtles (along with April, Casey, and Karai) desperately hunt for Splinter, as Super Shredder is seen to have survived and has Bebop and Rocksteady make sure that Splinter is truly destroyed. Donnie, Mikey, Raph and Casey go to search the Undercity for Splinter with their grappling hooks; unaware that Bebop and Rocksteady are not far. Meanwhile Leo, Karai and April lure Tiger Claw and Super Shredder to the surface. Leo is separated from the two girls and left to battle Super Shredder all on his own. Fortunately, April uses her extraordinarily powerful telekinetic abilities against Super Shredder and succeeds in saving Karai from being crushed by a truck that contains sulfuric acid (thanks to the mystical Sol Star fragment further amplifying her psionic abilities), her eyes glow a bright blue and she smiles malevolently as she hurls it right back at Super Shredder.
Tokka, who is shown to have survived the colossal implosion of the dwarf star in "The Ever-Burning Fire", returns and discovers that her baby boy (whom Raphael adopted as Chompy Picasso) is missing. Determined to get him back, she crash lands on Earth; leading up to an intense battle between her, the Earth Protection Force, and the Turtles who meet up with Bishop, who aids E.P.F. in advancing Earth's defenses against more extraterrestrial invasions. Raph manages to approach Tokka and explains that he only took her baby because he believed that she had perished, leaving Chompy motherless. Touched by this, Tokka leaves Chompy in Raph's care and returns to Magdomar. Splinter wonders what Raph will do once Chompy becomes full grown, to which Raph replies that he knows that Chompy is fated to return to the stars one day but will always look out for him until that day comes.
A dangerous female assassin and fox-mutant, by the name of Alopex, with super speed, appears who is bent on taking down her own brother, Tiger Claw, with the cursed Blades of Vengeance. The Turtles, April and Casey try to befriend her, but she turns on them and furiously goes after Tiger Claw alone, but not before she curses Casey with the blades. Unfortunately, for her, Tiger Claw has well prepared for her arrival. The Turtles make the scene and distract Tiger Claw while April uses her tanto to break the M.O.U.S.E.R. cage that traps her. In gratitude, Alopex returns one of the blades to Casey, and April uses her telekinetic abilities to borrow Tiger Claw's ice gun so Casey can destroy them, thus breaking their curse. Alopex pins Tiger Claw and seems prepared to kill him again but decides against it as it is not honorable. Tiger Claw shoots her from behind, but Alopex anticipates this and dodges the blast and slices off his right arm; an act that shocks even the Turtles. As Bebop and Rocksteady take the mutilated Tiger Claw away, Alopex takes off to the city rooftops again.
Guest Star: Minae Noji as Alopex.
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