Galactica has several brigs. One has at least two small cells with bunks and a desk to the outside the observe the prisoners and handle visitors. The other brig has one larger cell with no commodities for high-security prisoners. There is usually a Marine guard standing watch inside the room. In the high-security brig, there are usually around four.
After Sharon Valerii is revealed as a Cylon, Colonel Tigh orders the construction of a third reinforced brig, built for the specific purpose of containing captured humanoid Cylons, who possess strength far greater than a human, for an extended period (TRS: "Resistance"). The new Cylon brig is constructed with maximum security in mind; instead of having simple bars, its walls consist of metal grid screens welded tightly together, reinforced by composite plastics and a telephone is used to communicate between the inside and outside of the cell.
After being brought to Galactica, Caprica-Valerii is detained within the new Cylon brig. She spends over a year in this cell, but after Admiral Adama strikes a friendship with her, he allows her to decorate it almost like real quarters, with tables, chairs, a couch and other amenities (TRS: "Occupation").
Notable characters who have spent time in the brig are:
- Kara Thrace, for striking a superior officer (TRS: "Miniseries")
- Aaron Doral, under suspicion for being a humanoid Cylon (Miniseries)
- Socinus, for lying under oath and leaving his post (TRS: "Litmus")
- Gaius Baltar, for suspected acts of treason, allegedly collaborating with the Cylons (TRS: "Six Degrees of Separation")
- Laura Roslin, as a consequence of a successful coup d'etat led by Commander Adama (TRS: "Kobol's Last Gleaming, Part II")
- Sharon Valerii, exposed as a humanoid Cylon, for shooting Adama (TRS: "Kobol's Last Gleaming, Part II").
- Lee Adama, for mutiny ("Kobol's Last Gleaming, Part II". On parole up to "Resistance").
- Galen Tyrol, under suspicion of conspiring with Valerii (TRS: "Resistance"). Also confined to Pegasus's brig by Admiral Cain for the death of Lt. Alastair Thorne (TRS: "Pegasus").
- Karl Agathon, together with Tyrol for the above mentioned death of Lt. Thorne.
- Cally Henderson, for "discharging a firearm without permission" (killing Valerii in a crowded hallway) (TRS: "Resistance").
- Caprica-Valerii, detained while serving as a Cylon informant in the special Cylon brig ("Home, Part II" through "Precipice").
- Joe Palladino, for the attempted murder of a superior officer (TRS: "Final Cut")
- Gina Inviere, detained and tortured in Pegasus's brig as a humanoid Cylon ("Pegasus", "Razor").
- Royan Jahee, detained aboard Galactica for involvement in the Demand Peace movement (TRS: "Epiphanies").
- Asha Janik, for acts of sabotage on Galactica's Viper ammunition (Epiphanies).
- Cole Taylor, placed in Pegasus's brig by Commander Barry Garner for insubordination (TRS: "The Captain's Hand").
- Cavil copies, one serving as a brother, the second found on Caprica, placed in Galactica’s brig as humanoid Cylons (TRS: "Lay Down Your Burdens, Part II").
- Gaius Baltar after he is captured following his stay with the Cylons ("Rapture" to "Crossroads, Part II").
- Caprica-Six after defecting from the Cylons to the Colonials (TRS: "Rapture").
- Xeno Fenner for ordering the Hitei Kan's crew to strike and quoting from Baltar's book (TRS: "Dirty Hands").
- Cabott for co-leading the strike on the Hitei Kan (Dirty Hands).
- Galen Tyrol, for ordering the deckhands to strike (Dirty Hands).
- Kara Thrace for assaulting Laura Roslin and being suspected of being a Cylon (TRS: "Six of One").
- Sharon Agathon for killing Natalie, distressed by dreams of the Opera House (TRS: "Sine Qua Non").
- Tom Zarek for foiling the plan of integrating Cylon technology to the fleets jumpdrives (TRS: "A Disquiet Follows My Soul").