Planet Name Class Diametre (km) Position Moons Gravity Day (hrs.) Atmosphere Climate Industry
Breen M 12,500 V 0 1.0G 20.0 Terrestrial Cool Temperate Commerce
Breen - Class P - Breen Confederacy/Dominion

Location: Breen system, Alpha Quadrent

Affiliation: Breen Confederacy/Dominion (formerly)

Moon(s): none

Native Species: Breen

Population: billions

Gravity: 0.7 G

Breen is the homeworld of the Breen and their government.

The planet is the seventh in the Beta Epsilon-Venturi binary star system located near the border of the Alpha and Beta Quadrants. Thus, it is situated in a region of space between the planet Ferenginar and bordered the Romulan Star Empire. The Breen homeworld itself is highly frigid and cold due to the remoteness from its twin stars with temperatures never going above -70 degrees C. Furthermore, liquid hydrocarbons typically fell from the sky as rainfall. This highly hostile environment meant that no lifeform that lived on a Class M planet was capable of surviving on Breen without some form of advanced life support equipment. This world also lacks a hydrosphere though it did possess liquid methane oceans that covered half of the planetary surface. The only landmasses are two large rocky continents which dominated the Breen surface. Its known that the Breen homeworld had an extensive web of shipyards in orbit around their world.

History and politics
Shrouded in mystery, the Breen were one of the most underestimated races inhabiting the Alpha Quadrant. Historically, the Klingons were among the first to discover the consequences of underestimating the Breen. During the Klingon Second Empire, Chancellor Mow'ga ordered an entire fleet of Klingon warships to invade and conquer the Breen homeworld. The fleet never returned and was never heard from again.

Even by the 24th century, much was still unknown about the Breen and their otherwise politically nonaligned government, known as the Breen Confederacy. The Federation, however, had limited knowledge of the Breen and was aware of Breen outposts located near a black cluster in 2368. In 2370, the Breen participated in a palio held at Deep Space 3, during which the Ferengi attempted to bribe the Breen pilot into throwing the race. In 2373, the Breen settlements on Portas V near the Demilitarized Zone dealt with the Maquis, supplying them with cold-storage units. It was noted by Ezri Dax in 2375, when captured by the Breen on a planet in the Goralis system, that they were a long way from Breen space. Other species like the Ferengi had developed closer ties with the Breen by the late 24th century, as both species conducted trade negotiations in 2373. Breen privateers during the 24th century would often conduct indiscriminate raids against other Alpha Quadrant species. This includes the Breen attack and capture of the Cardassian transport Ravinok in 2366. The survivors of that attack were used for slave labor in the Breen operated dilithium mines on Dozaria. (DS9: "Indiscretion") In 2368, Starfleet feared the Breen might have attacked the science vessel SS Vico. Breen privateers also raided the Bajoran colony of Free Haven in 2372; they were, however, successfully driven away by the USS Defiant.

Alliance with the Dominion
In 2375, the Breen moved from a policy of low-level hostilities toward other major powers to one of open warfare when they allied themselves with the Dominion. They were then allowed access to the Dominion military database. According to the terms of the alliance, the Breen Confederacy received several planets in the Cardassian Union as compensation for joining the war.

The Breen may have been influenced to join the Dominion by a Changeling impersonator in the Confederacy's government, as an unidentified Breen was seen in Internment Camp 371, where several people who had been replaced by Changelings were placed.

Shortly after joining with the Dominion, the Breen attacked Starfleet Headquarters on Earth in the raid on San Francisco. A short time later they assisted Dominion forces in breaking the lines at Chin'toka. Under orders from the Female Changeling they allowed the escape pods to carry the Federation survivors to safety. This major battle, known as the Second Battle of Chin'toka, was won by the Dominion thanks to a unique Breen weapon, a form of energy dampening weapon system which could completely drain all the main power systems of a starship. Both of these defeats dealt a huge blow to the Allies' morale. The only ship immune to the Breen weapon was a Klingon Bird-of-Prey, which serendipitously survived thanks to an adjustment the chief engineer had made to the ship's tritium intermix in the warp core. Although the Klingon fleet was able to make the needed adjustments against the weapon, the Federation and the Romulans were still unable to defend against the Breen. When the Federation finally did create a defense against the energy-dampening weapon, they would force the Dominion fleet to retreat. Breen Thot Pran expressed an extreme distaste of surrender, and would require the reassurance of the female changeling that they were not surrendering, but were instead regrouping and attempting to redouble their shipbuilding and replenishment efforts.

With the necessary counter measures against the Breen's energy dampening weapon obtained, the Federation Alliance was able to go on the offensive once again, choosing to invade Cardassia Prime itself. In hopes of boosting the Breen's will to fight, the Female Changeling offered them control of Earth and Romulus if they succeeded in winning the battle. During the Battle of Cardassia, the Breen were still able to inflict major casualties on the allies, even without the use of their energy dampening weapon. Up to a third of the allies' entire fleet was destroyed during the battle, including the Romulan flag ship. The Breen continued to fight with the Dominion until the end, demonstrating a willingness to die for the cause that matched that of the Jem'Hadar. However, when the Cardassian forces switched sides mid-battle, the Dominion and Breen were forced to withdraw to Cardassia Prime. After Odo convinced the Female Changeling to surrender, the Dominion War ended. As allies of the Dominion, the Breen leaders were present during the signing of the Treaty of Bajor.


Breen physiology is among the most exotic for humanoid lifeforms, which may be due, in part, to their homeworld's climate. The Breen have no blood or other liquid circulatory system. The Breen brain is structured into four lobes; this protects them from the probing of some empathic species, such as the Betazoids, who are unable to detect the thoughts or emotions of the Breen. Breen appear physically more resilient than most humanoids.

Society and culture
The Breen commonly produce offspring at a very early age, at about the equivalence in physical growth of Human third grade children. The Breen entertain their offspring with nursery rhymes. Breen nursery rhymes can be made up of a heterophonic, five-line verse with an alternating tetrameter and pentameter structure. These are nonsensical phrases strung together because they rhyme . Some Breen music, which can accompany these nursery rhymes, is written on a Lyxian scale. It is unknown if this means a young average age for known humanoid species, or if the Breen have children at an age that would be considered young among Breen.

Treatment of prisoners
The Breen are known to use slave labor; and at least some of these slaves are captured in raids on other species. When the Breen were using Bajorans slaves to mine dilithium ore, there were always at least eight guards within the mines. The Breen are very prudent when dealing with prisoners. When capturing prisoners, the Breen typically stun them from long range with their disruptors, rather than approaching them and risking close combat. When Worf and Ezri Dax were discovered by the Breen on Goralis while sleeping, the Breen used this technique to subdue them. The Breen feed their prisoners a diet of algae paste, as well as hang them upside down to ensure they cannot escape. (DS9: "Penumbra", "'Til Death Do Us Part") On board starships, the Breen typically send in three guards at a time when they wish to remove a single prisoner from a cell that is being shared with other prisoners. Worf's various attempts at escape always failed, including his attempt to persuade the Breen guards that Ezri was sick, as well as his attempt to short-circuit the door. When Worf attempted to attack the Breen guards, they used a type of neural truncheon to paralyze him. Even after he fell to the ground, partially paralyzed, two Breen guards continued to use the truncheons on him to ensure he would not get back up, before two guards removed Ezri from the cell. In another incident, Worf simply showed signs of anger towards Weyoun and was again shocked by the neural truncheon. To extract information from captives, the Breen use cortical implants, despite the severe pain and damage it causes to the recipient. (DS9: "'Til Death Do Us Part")

Science and technology
Given that most known humanoid species live on class M planets with an average temperature far above the supposed temperature of Breen, the Breen are largely thought to have had to develop refrigeration suits in order to co-exist with others. However, if the Breen homeworld is temperate as suggested by Weyoun, then their reason for wearing environmental suits, if they were environmental suits at all, was much more mysterious. During the 2360s, the Breen were known for their development of organic technology, which they employed in the construction of their spacecraft. Some of their vessels were even believed to be fitted with cloaking devices. During the mid-2370s, Breen warships utilized energy dampening weapons. The Breen were known to use type 3 disruptors, like the Romulans and Klingons. The Breen also manufactured a portable hand-held cannon, the CRM 114. It was designed to target moving objects and surface emplacements. It was among the weapons dealt by the Ferengi arms dealer Gaila in the mid-2370s. The Breen made use of memory probing technology in the form of cortical implants and neural truncheons for subduing prisoners.

Known Planets
Breen is a planet in the Breen system, homeworld of the Breen species and capital world of the Breen Confederacy. Little is known about it, but the planet is widely believed to be a frozen wasteland.

Dozaria is a desert planet, located near the Cardassian Union and the Breen Confederacy in the Alpha Quadrant. It is the only Class M planet in the Dozaria system.

Portas V
Portas V is the fifth planet of the Portas system, located not far from the Demilitarized Zone. It is the site of a Breen settlement.

Bayside Mountains
City Alpha
City Beta
City Gamma
City Epsilon
City Eta
Polar Bay
Central Ocean
Capital City
Diplomatic Quarter
Frosty's Hothouse
Great Ice Ocean
Ice Cliffs
South Mountains
Polar Cap Mountains

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