Vincent is the head Psychologist of the prison, with a passion for science. He first started using the inmates of Sunnyville State Penitentiary that were on Death Row as his own "guinea pigs" for Satanic Rituals for the last few years. After using up most of the death row inmates, he gradually moved onto the other inmates.
Not much is known about his mysterious past except for the fact that he has been an orphan since he was 8, constantly jumping from foster family to foster family.
Cassie is the assistant to Vincent. She fell deeply in love with him when she started to work at the prison during her internship and as such, gladly helped him out when she knew what he was doing to the death row inmates. Using her looks and knowledge to her advantage, she would convince the death row inmates into agreeing to the experiments that Vincent would have plan for them.
Alexander has been the head physician at Sunnyville for quite some time now, and as such, has seen a lot of things go down. Although he has been at the prison for a while, the process of everything happening so rapidly was too much for him, which in turn has caused him to become psychotic.
Surrounding by the demonic presence and madness being released around the prison, Alexander started to go delusional and having advance knowledge of the human anatomy, he is a foe to be reckoned with.
The TS One's (short for Test Subject One) are Vincent's "first batch" of experiments gone wrong, messing around with human mutilation, sewing some mouth shuts or removing eye sockets. Due to the large amounts of psychiatric drugs that Vincent filled them with daily, they suffer from delusion and paranoia and roam the prison with weapons at the ready to defend themselves.
The TS Fives are Vincents fifth batch of wrong doing. This time upgrading his own mutilation procedures. He would surgically attach appendages from one inmate to another, seeing how he could make the perfect creature. Then when the apocalypse happened, the demons of hell possessed the inmates that didn't survive the procedure and now they roam the halls. Each one is in the possession of additional limbs, with the bones sticking out as their form of weapon.
As if mutilating the regular inmates was not enough for Vincent's curious mind, the TS Sevens will be the primary reason he will be going to hell. With the prison being a "co-ed" prison, Vincent wanted to expand his knowledge and see what he could accomplish with the newborns that were given life at the prison. He would attach parts from death row inmates to the babies and try to get them to work that way. Then the apocalypse happened and the demons made their ways into the corpses of the TS Sevens.
The TS X (or formally known as Test Subject Ten) are a mix breed of the K9 units that the prison has for both guard purposes and healing. After he was done with the K9 units, the hell hounds would find the corpses and occupy them, causing their own sense of mutilation to them.