Tales of the Teenage Mutant Ninja Turtles (2012 TV series)

The fifth and final season of the 2012 Nickelodeon television series, titled "Tales of the Teenage Mutant Ninja Turtles" aired on Nickelodeon from March 19, 2017 to November 12, 2017, consisting of 20 episodes. It mainly revolves around the turtles facing various supernatural threats, such as ghosts, werewolves, mummies, monsters, vampires, demons and aliens. It is the only season where they turtles are left to fend for themselves and are guided by Leonardo (following Splinter's death), although his spirit continues to watch over his family from the afterlife and occasionally visits them (mostly Leo) to offer some advice and suggestions.

The Kavaxas Saga
After avenging the death of their beloved sensei and father Splinter (thanks to the demise of the Super-Shredder at the hands of Leonardo), the four Turtles, April O'Neil, Casey Jones, Leatherhead and Karai have coped with his loss and are re-adjusting to their new daily lives as they wonder about what lies ahead, knowing the Foot isn't over yet and there are still enemies out there. Nonetheless, Splinter's spirit continues to watch over his family from the afterlife and occasionally visits Leo to offer him advice. As the heroes prepare for the next imminent threat, Leonardo succeeds Splinter as the team's new sensei, which makes his life more stressful and hectic due to the responsibilities he now has.

However, though the Turtles had believed that they have defeated their old enemies, they soon discover that a new evil is on the rise. The Foot Clan has been reborn as an underground cult led by Tiger Claw, who plans to resurrect the Super Shredder with the aid of the mighty demodragon named Kavaxas, who is summoned by the Scroll of the Demodragon and a controlling amulet called the Seal of the Ancients. Upon demonstrating his ability to revive the dead with Rahzar, who fell in an underwater battle against Leatherhead, Kavaxas states that he will need the Kuro Kabuto that contains Shredder's mental energies.

When Karai searches for the Kuro Kabuto, having become the rightful heiress of the Foot Clan, her former sensei, Hattori Tatsu, also seeks rightful ownership by hunting the Shredder's legendary helmet himself. Unfortunately, Tiger Claw and his lackeys are also in search of the helmet, as it is one of the essential items required for Kavaxas to return the Super Shredder to life. Upon Rahzar and Tiger Claw reclaiming the Kuro Kabuto after Kavaxas drained the soul out of Shredder's former right-hand man Hattori Tatsu, Kavaxas states that they will need the Shredder's heart for the revival to occur.

Donatello's grudge against Don Vizioso threatens the Turtles' newest mission: To retrieve the heart of the Super Shredder, which is in the possession of Don Vizioso himself. However, their mission fails, and the Foot Clan obtains the Shredder's heart.

With the aid of Karai and Leatherhead, the Turtles, April and Casey must defeat Kavaxas and prevent him from destroying the world with his army of the undead. Kavaxas successfully revives Shredder as an undead horror, who breaks the Seal of the Ancients, freeing Kavaxas and allowing him to raise the spirits of the Netherworld. While the ghost of Splinter helps those fighting on the surface, Michelangelo managed to use gum to stick the Seal of the Ancients back together, enabling him to control Kavaxas. He orders the demodragon to open the portal to the Netherworld, and the Zombie Shredder drags Kavaxas back to the Netherworld.

When Worlds Collide
Mona Lisa and Sal Commander arrive on Earth, asking the Turtles for their aid in finding the Newtralizer, who is now working with Lord Dregg.

Samurai Turtles Saga (Yojimbo, Osoroshi No Tabi and Kagayake! Kintaro)
In an alternate dimension inhabited by anthropomorphic animals in Feudal Japan, a lone rabbit Ronin named Miyamoto Usagi has been given a task to protect an unpleasant pug child named Kintaro, who is deemed as the "Golden Child" of the Sky Buddha. The gray wolf wizard Jei transported the Turtles into his reality, planning to use them to stop Usagi and Kintaro. With nowhere else to go, the Turtles ally themselves with Usagi to take Kintaro to the Temple.

Lone Rat and Cubs
A flashback shows how Splinter and the four Turtles as babies found their underground lair, while being pursued by the Kraang. After his victory, Splinter was given a second chance at fatherhood, naming the infant Turtles after his favorite Italian artists of the Renaissance.

Mutant Apocalypse Saga (The Wasteland Warrior, The Impossible Desert and Carmageddon!)
Fifty years later in an alternate post-apocalyptic future that has been caused by a Mutagen Bomb, Raphael and Donatello, who is now an android, scour a desert wasteland. They encounter a meerkat named Mira, who is being hunted by Verminator Rex and his Honey Badger Ravagers, and who has a map tattooed on her arm that leads to the Oasis. The trio set out to find a hermit called "the Holy Chalupa", who turned out to be Michelangelo, but they were later attacked by Verminator Rex and Imperius Reptilicus. The warlord Maximus Kong pursues them in his mobile fortress, and in a shocking revelation is shown to be Leonardo himself, driven mad with rage from a secondary mutation. Raphael manages to break through his brother's insanity and restore him to his old self, and the four brothers travel to the Oasis.

A shot shows the four Turtles and Splinter taking a picture together, followed by Leonardo holding a picket sign dedicated to the creators of the Teenage Mutant Ninja Turtles franchise, Peter Laird and Kevin Eastman.

Monsters Saga (The Curse of Savanti Romero, The Crypt of Dracula, The Frankenstein Experiment, Monsters Among Us!)
During Halloween, the Turtles and their time-traveling ally Renet are reunited with their enemy, Savanti Romero. He plans to turn all of New York City into a monster-filled dystopia, and their quest to stop him soon sends them back in time to Transylvania during the age of Dracula, and 1810's Central Europe to with Frankenstein.

The Bebop & Rocksteady Saga (Wanted: Bebop and Rocksteady, The Foot Walks Again and The Big Blow-Out!)
The Turtles once again meet their counterparts from the 1987-1996 series, due to their versions of the Shredder and Krang seeking help from the 2012 versions of Bebop and Rocksteady, as they had accidentally left their versions behind. Now the villains are planning to conquer the Earths of both the 1987 and 2012 realities with a fully powered Technodrome. While the Turtles and their allies fight off a horde of Foot Soldiers from the 1987–1996 series reality and the 2012 Rock Soldiers, Bebop and Rocksteady discover Shredder and Krang's plans to destroy the Earth and choose to become heroes in order to save the planet.

Main Characters/Protagonists

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Allies

 * Commander G’Throkka / Sal Commander
 * Lieutenant Y’Gythgba / Mona Lisa
 * Queen
 * Rook
 * Pawn
 * The
 * Hamato Miwa / Karai
 * Shinigami
 * The
 * Esmerelda
 * Kintaro
 * Akemi
 * Tanuki
 * Esmerelda
 * Esmerelda
 * Kintaro
 * Akemi
 * Tanuki
 * Esmerelda
 * Kintaro
 * Akemi
 * Tanuki
 * Esmerelda
 * Tanuki
 * Esmerelda
 * Tanuki
 * Esmerelda

Villains

 * Kavaxas
 * Takeshi / Tiger Claw
 * The Newtralizer
 * Sumo Kuma
 * Count Vlad Dracula
 * Vampires
 * Vulko
 * Verminator Rex
 * Vizioso Mob
 * Don Vizioso
 * The Hammer
 * Fulci Twins
 * Hattori Tatsu
 * Ho Chan
 * Krang
 * Shredder
 * Jei
 * Joroguma
 * Bebop
 * Rocksteady
 * Foot Soldiers
 * Traag
 * Granitor
 * Jei
 * Joroguma
 * Bebop
 * Rocksteady
 * Foot Soldiers
 * Traag
 * Granitor

Episodes

 * 1) Scroll of the Demodragon
 * 2) The Forgotten Swordsman
 * 3) Heart of Evil
 * 4) End Times
 * 5) When Worlds Collide part 1
 * 6) When Worlds Collide part 2
 * 7) Yojimbo
 * 8) Osoroshi no Tabi
 * 9) Kagayakei Kintaro
 * 10) Lone Rat and Cubs
 * 11) The Wasteland Warrior
 * 12) The Impossible Desert
 * 13) Carmageddon!
 * 14) The Curse of Savanti Romero
 * 15) The Crypt of Dracula
 * 16) The Frankenstein Experiment
 * 17) Monsters Among Us!
 * 18) Wanted: Bebop & Rocksteady
 * 19) The Foot Walks Again
 * 20) The Big Blowout