- Not to be confused with the episode.
|“Invitations to Shintaro are exceedingly rare. In recorded history, there have only been a handful of outsiders allowed into the Ivory City.”|
|— Zane, "Shintaro"|
Shintaro Mountain is a mountain that is located in northern Ninjago. The Kingdom of Shintaro resides on the top of the mountain, while in its bowels are the Dungeons of Shintaro, a cavern that was created by Hazza D'ur.
The Ninja and Wu arrive at the Kingdom of Shintaro and greet King Vangelis. Vania then arrives and greets the Ninja as they leave the Throne Room.
When Cole is about to sleep, Lloyd comes in and warns that Vania may have evil intentions. Cole doesn't think so and begins to sleep. Suddenly, he sees Gleck about watching him. Cole tackles him and sees an unknown necklace. Gleck then takes the necklace back and runs away.
Cole then gets everyone to meet and he tells them about an unknown purple monster; however, the Ninja don't believe him and head back to their rooms. As Cole heads back to his room, he spots Vania and she tells him about a purple monster when she was little. She then leads him to a restricted tunnel where they both enter.
Along the way, Vania talks about Hazza D'ur, an evil wizard who created the Dungeons of Shintaro before the Sky Folk lived in Shintaro Mountain. They suddenly come across underground mine operations. They see the same purple monsters as well as a couple of green people and a Mino being forced to mine for Vengestone. They then see an evil wizard come out of the Skull Keep and use the Skull of Hazza D'ur to punish the workers for slacking off. Cole then decides to intervene while Vania would warn her father. However, Cole is defeated by the Awakened Warriors.
Vania warns the Ninja (minus Cole) about everything she saw in the Dungeons of Shintaro. They warn Vangelis and informs the Ninja to not enter and he'll send his guards to save Cole. The Ninja still disobey his orders as Vania shows the Ninja the way.
Meanwhile, Cole is forced into labor and tries to cope with the situation by talking to Murt and Gliff, but both sides dislike each other and begin to argue with each other.
The Ninja finally make it to the Dungeon of Shintaro and attempt to free Cole, but the two tribes fight each other which allows the Skull Sorcerer to imprison everyone.
Wu and Vania use cardboard cuts of the Ninja to make it as if the Ninja are still in the Kingdom of Shintaro although they are still underground.
Meanwhile, the Ninja discovers why the two tribes dislike each other which all comes down to both sides accusing each other of stealing each other's blades. The Ninja then hatch a plan to escape, but it requires both tribes to not fight each other.
The Ninja are able to escape their cage and begin freeing everyone else. Lloyd and Cole enter a tunnel trying to find one of the blades, but they discover the Skull of Hazza D'ur. The Skull Sorcerer then enters and chases Cole and Lloyd.
After the rest of the Ninja are able to free everyone else, the Awakened Warriors attack them, but the Ninja are able to deal with most of them. During the chaos, Lloyd, Nya, and Jay take one tunnel while Kai and Zane take another. Meanwhile, Cole is chased by the Skull Sorcerer and takes a completely different tunnel.
Murt leads Jay, Nya, and Lloyd to the Munce Home-Cave. The Munce realize it's Murt and he explains how he was able to escape using exaggerated body motions. Queen Murtessa thanks the Ninja, especially Jay who she takes affection for.
While Nya is complaining that she was called a "Yang Servant", Lloyd discovers a mural depicting a warrior fighting a dragon. The Ninja are then called to eat, but the Munce would only allow Jay. Nya demands everyone to eat, and they allow her in.
While dining, Murtessa continues to take affection for Jay, so she asks if he can be his partner. Nya interjects herself and claims she is Jay's partner. Murtessa then challenges Jay to a duel, and Nya accepts.
At first, Murtessa has the upper edge, but Nya is able to win by using Spinjitzu. The Munce realize Murtessa has been defeated and proclaim Nya is the new queen.
Kai and Zane are taken to the Geckle Strong-Cave and are placed in a Trial by Mino. Surprisingly, Zane is able to calm down the beast and Kai is elected chancellor. He suggests uniting with the Munce, but the Geckles laugh at his idea.
Cole fights to stay alive from the Dire Bats and a Giant Spider. Luckily, he is saved by Vania and Chompy and they head back to the surface. Vania, Cole, and Wu warn Vangelis, but he reveals himself to be the Skull Sorcerer. He then presses a button causing Wu and Cole to fall into a pit, so Vania goes after the two.
The Munce and Geckles meet at the truce point where tension rises between the two tribes. After the Ninja are able to settle things down, Grief-Bringer arrives and everyone flees.
Wu, Cole, Vania, and the Upply are running away from the Lava Monster. They stumble across some mine carts and decide to ride in it. They end up at the Heart of the Mountain and discover Lilly performed the Spinjitzu Burst. Cole tires but fails multiple times.
The Ninja, Geckles, and Munce take refuge at the Geckle Strong-Cave. While Grief-Bringer and the Awakened Warriors are trying to destroy the door, tension rises between Murtessa and Gluch. The two tribes end up declaring peace after they realize there is no way to escape. The Awakened Warriors destroy the door, and the Ninja decide to surrender themselves in exchange for the Geckles and Munce to remain free. However, the Skull Sorcerer doesn't keep his promise and captures everyone.
In order to get back to the surface, Cole uses the Fire Stone Mech to push everyone else who are in the mine carts. Along the way, they encounter the Dire Bats as well as the Lava Monster. Despite the challenges, they are able to make it back to the Ivory City.
Vania rescues Chompy from his cage, but Hailmar and the Winged Guards of Shintaro also show up and demand for Cole's arrest. They resist and Cole and the Upply are able to escape. Meanwhile, Vania tries to reason with Hailmar, but he charges at her.
The Geckles and Munce are back to working while the Ninja are trapped in a cage. Cole and the Upply arrive and then begin their battle plan. Plundar and Cole are able to steal the Blades of Deliverance while Korgran and Fungus give a key to Murtessa for them to use to liberate themselves.
During the execution ceremony, the Skull Sorcerer realizes something has gone wrong as Grief-Bringer was not released. Cole then shows himself and starts fighting. The rest of the Upply also fight and yell at the Geckles and Munce to free themselves. While everyone is fighting, Adam and Plundar free the Ninja so they could join the fight.
The Ninja, Upply, Munce, and Geckles are fighting the Awakened Warriors and Grief-Bringer. Despite being overwhelmed, Vania, the Winged Guards of Shintaro, and Chompy also enter the fight.
While Cole is fighting the Skull Sorcerer and the Skull of Hazza D'ur, the Skull Sorcerer uses the skull to blast Cole. He then remembers the promise he made to his mother and performs the Spinjitzu Burst. This destroys the Skull of Hazza D'ur which in return obliterates the Awakened Warriors and Grief-Bringer. Vangelis loses his identity as the Skull Sorcerer and begs for mercy, but he's taken away by his former guards.
Everyone gathers at the Kingdom of Shintaro to witness Vania become the queen of Shintaro Mountain. She promises equality and peace for all. The Ninja leave and say goodbye to everyone they've met.
- Hazza D'ur (deceased)
- Awakened Warriors (deceased)
- Sky Folk
- Dire Bats
- Lava Monster (deceased)
- Giant Spiders
- Giant Tortoise
- Kingdom of Shintaro
- Dungeons of Shintaro
- 145. "Shintaro"
- 146. "Into the Dark"
- 147. "The Worst Rescue Ever"
- 148. "The Two Blades"
- 149. "Queen of the Munce"
- 150. "Trial By Mino"
- 151. "The Skull Sorcerer"
- 155. "Grief-Bringer"
- 156. "Masters Never Quit"
- 157. "The Darkest Hour"
- 158. "The Ascent"
- 159. "The Upply Strike Back!"
- 160. "The Son of Lilly"
- According to Tommy Andreasen, Shintaro Mountain has a metaphorical connection to the mountain Cole climbed when he first met Master Wu.