Located on a small island in the Gotham Bay, Blackgate Prison was the primary penitentiary in which the sane criminals of Gotham City were incarcerated, whereas criminally insane individuals were housed at Arkham Asylum.
Before Arkham Origins Incident
Blackgate was the primary prison for criminals of Gotham City. Insane people were imprisoned there along with the sane due to the lack of mental health facilities in the city. Many of its guards were corrupt taking bribes from Black Mask and Penguin. Some guards were cruel to the inmates, beating them without consequence. To combat this, a new warden was appointed. He was not corrupt, but he was easily manipulated.
In December of Batman's second year of crime fighting, Julian Gregory Day was arrested on multiple counts of murder. He was psychologically evaluated by Dr. Harleen Quinzel, who deemed him insane. After this, Warden Joseph was manipulated into making Quinzel reevaluate her patient. This led to his being deemed sane and eligible for execution.
Arkham Origins Incident
Black Mask invaded Blackgate Prison along with Killer Croc to release the prisoners, as well as kill Commissioner Loeb, until Batman arrived to stop them. After he encountered Warden Joseph, Batman followed a trail of death and destruction caused by Killer Croc, until he discovered that Black Mask had put Calendar Man in the gas chamber, but gave up on killing him, and put Loeb in instead. Black Mask then turned the chamber on, killed Loeb, and made Batman swear that he would stop him.
After they got to the roof of the prison, Black Mask and his gang escaped, minus Killer Croc, who stayed to kill Batman and get the bounty. They fought until Croc was defeated, then Batman interrogated him until he discovered that Black Mask had put a bounty on his head, but was interrupted by Captain Gordon. Batman then fled the facility in the Batwing, and left Killer Croc to be arrested.
Throughout the night, Batman arrested several criminals, who were sent to Blackgate to await trial. These included Black Mask, Mad Hatter, Copperhead, Deathstroke, Deadshot, Anarky, Firefly, Ricky "Loose Lips" Leblanc. Bird, Black Mask's Gang. Joker's Henchmen, The Penguin's Henchmen, Bane's Henchmen.
After Batman tracked the Joker to the Gotham Royal Hotel, he was captured and later imprisoned at Blackgate. Sometime later, Joker lead yet another riot at the prison. Batman arrived to stop Joker only to find Bane wearing a heart monitor that was charging an electric chair that he was sitting in. The only way to end this was for someone to die. Batman realized that no one had to die, someone's heart just had to stop beating. Batman used the Electrocutioner's Shock Gloves to temporarily stop Bane's heart. Joker later tried to escape with the intent of detonating the bombs that had his men place all around the city, but was pursued by Warden Joseph and Captain Gordon. Batman resuscitated Bane by using the Shock Gloves, but Bane injected himself with TN-1, which turned him into a gigantic, mindless beast. Batman defeated Bane in the sub basement level. He tied him up and left the police to find him. Joker had Joseph shot and he ran into the prison chapel. Batman disarmed him, beat him up, and left him to be arrested. Even though Captain Gordon was under orders to arrest the vigilante, he let Batman go believing that he could help Gotham City.
During the riot, 20 prisoners escaped. Gordon contacted Batman for help as he was short handed. Eventually, Batman found them all and left them to be arrested and taken back to Blackgate.
Cold Cold Heart Incident
Penguin, Mr. Freeze, and GothCorp CEO Ferris Boyle ended up sent to Blackgate due to their respective roles in attacking Wayne Manor, selling freeze guns on the streets, and human experimentation/illegal weapons manufacturing. In Freeze's case, his incarceration there ultimately led to a hastening of reopening Arkham Asylum due to Blackgate being ill-equipped to provide for his subzero condition.
Arkham Origins Blackgate Incident
Three and a half months after the Christmas Eve Incident, a mysterious explosion occurred at Blackgate Prison, one that allowed all of the inmates, including Black Mask, Joker, and Penguin, to take over the prison and hold the staff hostage.
Arkham Asylum Incident
The Blackgate Prisoners were relocated to Arkham Asylum because a "mysterious fire" had burnt the prison down. During the incident, Batman discovered that the fire was caused by Frank Boles, a corrupt guard who worked at Arkham Asylum. It was also mentioned by Gordon as he thought Bane broke out of Blackgate.
Arkham City Incident
The Arkham City prisoners could be heard talking about the building that was Blackgate Prison, with some of them that said that they heard that it was turned into a shopping mall.
Between Arkham City and Arkham Knight Incident
After it was shown that the late Joker had somehow exposed Commissioner Gordon to a strain of Joker Toxin, Batman was forced to break Harley Quinn out of Blackgate to quickly track down an antidote. It's revealed that after the fire had burnt down the prison, the city had sent construction builders in to rebuild it. Afterward, the prison was re-dubbed New Blackgate.
- The Joker (deceased)
- The Penguin (Oswald Cobblepot)
- Black Mask (Roman Sionis) (possibly deceased)
- The Riddler (Edward Nigma)
- The Mad Hatter (Jervis Tetch)
- Deathstroke (Slade Wilson)
- Deadshot (Floyd Lawton)
- Calendar Man (Julian Gregory Day)
- Anarky (Lonnie Machin)
- Firefly (Garfield Lynns)
- Ferris Boyle
- Ventriloquist (Arnold Wesker)
- Killer Croc (Waylon Jones)
- Bronze Tiger (Ben Turner)
- Ratcatcher (Otis Flannegan) (deceased)
- Ricky "Loose Lips" Leblanc
- Catwoman (Selina Kyle)
- Bird (Angel Vallelungua)
- Scarecrow (Dr. Jonathan Crane)
- The Blackgate Prisoners
- Black Mask's Gang
- Joker's Henchmen
- The Penguin's Henchmen
- Penguin, Catwoman, Black Mask, and the thugs of the super-villain gangs usually ended up here after the asylum was reopened, since they were deemed sane.
- Jonathan Crane used to be an employee but was fired once his fear gas was discovered.
- Warden Joseph only appeared in Batman: Arkham Origins and Batman: Arkham Origins Blackgate.
- Blackgate Prison appeared in the online multiplayer of Batman: Arkham Origins, where Batman and Robin tried to stop the Joker and Bane from making a breakout and freeing their followers.
- The player could find Calendar Man's cell in Arkham Origins.
- The cutscene used at the end of Batman: Arkham Origins was the same as the one that was used at the beginning of the game, just with some fire in the background.