The Planet Prison was designed to supercharge the upper atmosphere of a planet with what was essentially an ion pulse, turning the entire atmosphere into an enormous ion cannon. Any vessels that attempted to enter the atmosphere, whether they be leaving the planet or attempting to land, would be instantly disabled. The engines and systems of any vessel in the ion field would shut down, forcing the ship to crash.[1] However, one drawback of the weapon was that it required an immense amount of energy and time to charge up to firing capacity, and it generated large amounts of heat while charging.[6]
"All I've ever wanted was to protect the Republic. I was stationed here when the Empire attacked Coruscant. Saw the Jedi Temple destroyed. All those Padawans and Masters cut down… I started these weapon projects in their honor."
The different weapons projects eventually came to be headed by Doctor Eli Tarnis, though he worked mainly on the Planet Prison.[1] However, Tarnis was in fact the son of Darth Angral, the commander of the Sith forces who had led the Sacking of Coruscant.[5] A Sith Lord himself, Tarnis was masquerading as a scientist to gather information on the weapon projects.[8] Tarnis headed a five-man design team for the Planet Prison, including a man named Jonkan.[6]
In 3,643 BBY,[4] the project was nearing completion, and the scientists were about to begin field testing when Tarnis hired the Black Sun criminal syndicate to steal the design files. Black Sun tasked a Rodian named Vistis Garn with the job, and Garn proposed the heist as his own idea to his main employers in the Migrant Merchants' Guild, a rival criminal gang. Garn and his team infiltrated a militarywarehouse and stole the files from the building's computer system. They also made off with a shipment high-tech weapons and munitions, but not before Garn was identified by the building's security system. General Suthra and Jedi MastersBela Kiwiiks and Orgus Din assigned Din's former apprentice, a Jedi Knight, the task of recovering the files, and ordered Kiwiik's PadawanKira Carsen and the SISAgentGalen to assist the Knight.[1]
The five members of the design team, including Jonkan, were murdered by Tarnis after delivering the prototype.
Traveling to the gang-controlled region, the Knight and T7-O1 learned of Tarnis' true identity as a Sith Lord,[8] and pursued the traitor to the Justicars' Sector in an attempt to locate the Planet Prison device. There, the duo found the bodies of the project scientists, who had been tricked into bringing Tarnis the actual prototype. One of the scientists, Jonkan, was able to tell the Knight that the weapon needed time to charge and that it generated massive amounts of heat while doing so.[6] Using that information, the Knight and Carsen were able to locate the Planet Prison in the ruins of the Jedi Temple, and pursued Tarnis there. Standing before holograms of Tarnis' father and Angral's apprentices, the Knight fought and defeated Tarnis and destroyed the Planet Prison device.[5]
The Planet Prison technology would later be reused by Tarnis' fatherDarth Angral, who combined it with several other stolen superweapons to create the Desolator weapon. Angral installed the device on his personal flagship, the Oppressor, and used the Desolator to devastate the Republic agriworld of Uphrades. The ionization of the planet's atmosphere worked perfectly, preventing any survivors from escaping the planet, and the crew of the Republic medical frigateDaybreaker intentionally allowed their ship to be disabled by the field so that they could aid the survivors.[10]
The Planet Prison's main console
Having successfully tested the weapon, Angral moved his ship to the Jedi Order's homeworld of Tython and prepared to use it in his quest for revenge against the Knight for the death of his son. Above Tython, Angral deployed micro-burst versions of the Planet Prison, temporarily ionizing the planet's atmosphere and disabling the Republic fighters mobilized against the Oppressor.[11]
However, the Desolator also inherited the Planet Prison's power drawbacks, requiring the weapon to charge for extended periods of time. That weakness enabled the Knight, T7-O1, and Carsen to slip aboard the Oppressor and disable the Desolator before it could fire again. With the destruction of the Oppressor by Republic fighters, the last traces of the Planet Prison technology were finally eliminated.[11]
The Planet Prison was created for Star Wars: The Old Republic, a massively multiplayer online role-playing game released by BioWare on December 20, 2011. It serves as the target of the Jedi Knight class storyline on Coruscant, and is the first of several superweapons that serve to further the plot of the Act I storyline. Regardless of alignment choices, the Planet Prison is destroyed by the player after Tarnis is defeated.[5] It is mentioned in the Act I finale by Doctor Nasan Godera while discussing the Desolator weapon, as Godera analyzes the superweapon's design to find a flaw similar to that of the Planet Prison.[11] The Planet Prison is also mentioned in the 2012 reference guide Star Wars: The Old Republic Encyclopedia, in the entries for Doctor Godera and the Jedi Knight class storyline.[2]