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The Samurai X Cave is an underground base built by Nya in the Sea of Sand. It serves as her personal headquarters and storage for her various machines, vehicles, and gear. During the Nindroid crisis, Garmadon and Lloyd entered the cave to get Nya's car, which they used in their effort to escape the Nindroids and prevent them from capturing Lloyd.
Following the defeat of the Golden Master, Wu and Nya began rebuilding Destiny's Bounty in the cave. When the Elemental Masters returned from Chen's Island, they met up at the cave to discuss their plan of action, as the second Serpentine War was about to commence. Sometime later, Morro and several of his allies entered the cave to steal some of the gear there. Ronin and Nya tried to stop them, but Ghoultar corrupted Nya's Samurai Mech, transforming it into the Mech-enstein. Sometime later, Wu assembled the ninja at the cave to tell them Ronin and Misako went missing on the Dark Island.
When Nya became Samurai X, she built her secret base and store for her Samurai Mech and other vehicles in the cave system in the Sea of Sand. She later programmed the Falcon to know the location of the cave.
After creating plans for the reconstruction of the Destiny's Bounty, Wu and Nya went to the Samurai Cave where they began rebuilding the ship. While they were working on it, Misako arrived reporting she had yet to receive word from Garmadon or the ninja. Wu decides they must expand their search and Nya departs in the D.B. Express.
Misako attempted to use the cave's computer to contact Nya and Dareth but did not receive a response from either of them.
Wu and Misako communicated with Nya at the Cave.
The Elemental Masters met up with Wu and Misako at the cave to discuss their plan of action, as the Anacondrai warriors had arrived in Ninjago. The alliance formulated a plan to spread out and attack Chen's noodle trucks, which were transporting Chen's Anacondrai-turned followers.
Following the separation of the Elemental Masters, Lloyd had Neuro send a message to the other Masters, telling them to regroup in the cave. After doing so, they came up with the plan of stopping the Anacondrai imposters in the Corridor of Elders.
At the Cave, the Ghost Warriors possessed Nya's Mech, which she and Ronin failed to get back. As her Samurai equipment does no harm to Ghosts, they had to flee.
Following Misako and Ronin disappearing on the Dark Island, Wu summoned the ninja to the Samurai X Cave where he explained to them the situation.
Nya, Jay and Cole take Zane to the cave to try reboot him since Cyrus Borg was kidnapped by Acronix and Krux and wasn't able to help him with his technology anymore. Later, Zane suddenly wakes up and spills out some random numbers before falling again.
- 37. "Versus"
- 40. "Spellbound"
- 41. "The Day of the Dragon"
- 42. "The Greatest Fear of All"
- 44. "The Corridor of Elders"
- 1. "Legacy"
- 2. "Vehicles and Mechs"
- 3. "Legendary Places"
- 4. "Ninjago's Most Wanted"
- 5. "The Digiverse and Beyond"
- 6. "The Elemental Masters"
- 7. "Beasts and Dragons"
- 8. "Rise of Garmadon"
- 9. "Prophecy of the Green Ninja"
- 10. "Greatest Battles"
- In "The Art of the Silent Fist," when Lloyd and Garmadon enter the cave, an unknown vehicle can be seen in the background. It looks similar to Samurai X bike from set 70596 Samurai X Cave Chaos.
- Presumably after the Final Battle, Nya retired her boomerang and hung it in the Samurai X Cave as a memento.
- It is unknown what happened to the cave after The Hands of Time, as since Secrets of the Forbidden Spinjitzu the ninja and P.I.X.A.L. have a new, very similar base inside the Mountains of Impossible Height.
- When asked about the circumstances surrounding the skeleton that guards the cave, Tommy Andreasen said, "Assume anything you will. The mystery has merit."
- Prior to "The Art of the Silent Fist," the Falcon and Nya were the only beings to know the secret location of the cave.