|“Sorry I had to confiscate your weapons. Here we try to foster what I call "an environment of encouragement."”|
|— Warden Noble|
- Stone Army
- Soto's Pirate Crew
- The Mechanic
- Sky Pirates
- Sons of Garmadon
- Hageman Brothers (formerly)
- Aspheera (formerly)
The following villains below were once inmates of Arkham Asylum, but were moved to Kryptarium after Arkham's destruction.
- Kirk Langstrom
- Poison Ivy
- Kryptarium Prison contains some of the world's most dangerous culprits.
- Original concept art depicted Kryptarium as being constructed around a large spire.
Kryptarium's design is based on a panopticon prison.
- It is unknown what happened to the prisoners when Harumi and Lord Garmadon took it. They may have simply been off-screen.
- As of Season 8: Sons of Garmadon, the inmates no longer wear prisoner outfits. The reason for this is unknown but was likely done for the fans to easily recognize the characters.
- Garmadon was imprisoned in a very special solitary confinement cell that is only accessible by Noble's eye iris and a retractable bridge.
- In the original end of Season 7: Hands of Time, Acronix and Krux would be locked in Kryptarium Prison, but ended up lost in time.
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