Kryptarium Prison

Kryptarium is a prison located in the Sea of Sand. It is a large facility operated by Warden Noble that is home to Ninjago's worst of the worst.

Inmates

 * Kruncha (Formerly)
 * Nuckal (Formerly)
 * Wyplash
 * Frakjaw
 * Giant Stone Warrior
 * Nindroid Warrior
 * No-Eyed Pete
 * Captain Soto
 * Doubloon (Formerly)
 * Pythor (Formerly)
 * The Mechanic
 * Kai (In an alternate timeline)
 * Cole (In an alternate timeline)
 * Jay (In an alternate timeline)
 * Nya (In an alternate timeline)
 * Zane (In an alternate timeline)
 * Lloyd (In an alternate timeline)
 * Dan Hageman
 * Kevin Hageman

History
At some point in time, prior to the defeat of the Overlord, Kryptarium Prison was built to house Ninjago's most dangerous criminals, and at the same time, rehabilitate them as well.

The Tall Tale of Doubloon
Arrested for stealing from a bank, Doubloon was placed into Kryptarium, only to escape by hiding underneath a blanket and digging his way through his bed and the floor, arriving in the underground tunnels.

Countless years later, Noble would eventually quit his principal job at Darkley's Boarding School for Bad Boys and become the prison's warden, becoming dedicated to the rehabilitation of the prisoners.

The Greatest Fear of All
In an attempt to figure out a weakness of the fake Anacondrai, the ninja visited Kryptarium in order to interrogate a shrunken Pythor. However, the prison was infiltrated thanks to the efforts of Kapau'rai and Chop'rai, and several of the inmates escaped thanks to No-Eyed Pete using a fallen staff to open all of the door cells. However, with the help of the Ninja, the inmates were all detained, save for Pythor, and the prison was eventually repaired.

The Corridor of Elders
Cole went to Kryptarium to ask the inmates to help them defeat Chen's Anacondrai army.

Shadow of Ronin (Non-Canon)
Shortly after Ronin stole the Ninja's memories, he sent his goons to Kryptarium to get the map to the Inky Lemonberry from Hibiki. However, the Ninja soon arrived seeking Hibiki's help as well and sent the goons in retreat.

Enkrypted
After being captured by Ronin, the ninja were sent to Kryptarium, and due to their powerful status, were detained in the section for the most dangerous criminals. There, they were confronted by several angry inmates, including the Mechanic. However, the prisoners were quickly placed into their cells, and at lunch, the ninja managed to learn from Soto the weakness of a Djinn; the Tiger Widow venom. Following a brief skirmish with the inmates, the ninja agreed to help Soto escape the prison in return for the location of Tiger Widow Island.

As a result of Jay's final wish erasing the events of the season, Kryptarium regained its escaped convict, Soto.

Appearances
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Season 4: The Tournament of Elements

 * 43. "The Greatest Fear of All"
 * 44. "The Corridor of Elders"

Season 6: Skybound

 * 57. "Enkrypted"

Tall Tale Mini-Movies

 * 3. "The Tall Tale of Doubloon"

Video Games

 * LEGO Ninjago: Shadow of Ronin (non-canon)

Graphic Novels
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 * LEGO Ninjago: Ghost Ninja (non-canon)