Slabside Maximum Security Prison, also known as Slabside Penitentiary, is a maximum-security penitentiary located in the United States.
This Level is the Main Level for every inmate of the prison. This is the level where most prisoners are.
Only the most violent are sent to Level Two. This level was never made public due to the fact that it was used to store the more violent inmates who've descended into their more violent nature. They received treatment from Jarrett Parker. When Oliver Queen and Talia al Ghul managed to expose the truth about Level Two, it was closed down and all inmates being held there were sent back to Level One.
- B. Dunbar (guard; deceased)
- Jarrett Parker (chief psychiatrist; deceased)
- Peter Yorke (guard; fired)
- Talia al Ghul (escaped)
- Daniel Brickwell/Brick (deceased)
- Ricardo Diaz/Dragon (deceased)
- "Grim Reaper" (deceased)
- Oliver Queen/Green Arrow (released)
- Derek Sampson (deceased)
- Ben Turner/Bronze Tiger (released on parole)
Behind the scenes
- In the DC comics, Slabside Penitentiary or the Slab, is a meta-human prison run by Shilo Norman/Mister Miracle.