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Smelly Lid Prison (臭蓋獄, Shūgai-goku; Viz: The Stink Slammer) is a prison located in an unknown city. This prison holds some of the worst criminals on Earth.


Chalk outline

The chalk outline of the deceased

The prison has a tall gate and tall walls with barbed wires. The building is heavily monitored with cameras on different locations with large monitors for the guards to see. For more difficult prisoners like Speed-o'-Sound Sonic, they use a special restraining device designed by the Hero Association. The cells that hold the most difficult prisoners is behind a thick, barricaded door. Inside are the most difficult offenders, who can use their strength to pry open iron bars or can use everyday objects as weapons and poison. The inside of the walls are made of steel and there are no windows, and only Puri-Puri Prisoner can break through the walls.[1]

Prison Warden

Prison Warden

As part of the Monster Association raid, some prisoners have been transformed into monsters by Nyan. Some prison wardens were also killed in the monster raid.


Name Status
Demolition John Deceased †
Smelly Lid Old Man Deceased †
Special Moves Mile Deceased †
Base B Deceased †
Puri-Puri Prisoner Escaped
Speed-o'-Sound Sonic Escaped


  1. One-Punch Man Manga; Prison


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