| The Combine
| Political information
| Type of faction / organization
Cross universe/dimensional empire
| Head of Government
| Societal information
| Capital / Headquarters
See Combine weapons
See Combine technology
| Game information
- "We should thank Our Benefactors for giving us respite from this overpowering force. They have thrown a switch and exorcised our demons in a single stroke. They have given us the strength we never could have summoned to overcome this compulsion. They have given us purpose. They have turned our eyes toward the stars."
- ―Wallace Breen
The Combine, referred to as "Our Benefactors" and CMB in propaganda, and once as "The Universal Union", is the title of an immense and powerful interdimensional organization, composed of a variety of both allied and enslaved species.
The Combine is a vast empire, spanning multiple parallel universes. The empire is inhabited by an unknown number of sentient species, and is possibly governed by a race of artificially evolved Advisors of the Combine Overworld. The Combine empire expands by invading worlds and exploiting their dominant species as it sees fit. By manipulating these species through methods including bioengineering and implantation, the Combine creates races of super-soldiers uniquely adapted for the particular environments of the conquered worlds. This process results in a highly mobile and adaptive military force which is able to respond to any threat and crush any opposition. The reasons behind the Combine's imperialism remain unknown throughout the series.
When pronouncing the word "Combine", vocal stress is placed on the first syllable. The name is pronounced COM-bine, as in combine harvester, as opposed to the verb form com-BINE, as in "to join together or unite." Dr. Breen refers to the Combine Soldiers and Civil Protection as The Transhuman Arm of the Combine Overwatch in Nova Prospekt, verifying that "Combine" is an accepted name of the empire, even by the empire itself.
Until recently, it was speculated that the Combine possibly controlled Xen during the first Half-Life game, based on the similarities to some practices and technologies used by the Nihilanth. However, Valve's marketing director Doug Lombardi stated that the Combine had, in fact, invaded a different homeworld from which Nihilanth's race was forced to escape. The defeated Nihilanth sought refuge in Xen, where the Combine could not (or would not) follow.
"We had a glimpse of the larger threat when we were working on Half-Life. In other words we knew that once you cleared out the Nihilanth, you were going to discover something worse beyond it. We knew that some immense threat had chased the Nihilanth and its creatures out of their own world and into Xen, from which location [i.e. the world beyond Xen] they were all too glad to seize the opportunity to continue on to Earth with suppression through the Citadels. But the exact nature of the threat was left to be solved in Half-Life 2."
The Nihilanth and the Combine are now established as former enemies who had knowledge of each other. When contacted, Marc Laidlaw provided more information:
"I'm pretty sure Doug was restating something I'd told him; I [am not] clarifying it, since it's the foundation on which the series continues. What we saw in HL1 was the very end of a long struggle between the Combine and the last of the Nihilanth's race ... The Nihilanth's "world" (if it could be said to have) was long since in the past as far as the Nihilanth was concerned; Xen was their final retreat, and they had their back to the wall, as it were, when the fissure appeared that let them spill into our dimension. Xen itself is sort of a dimensional transit bottleneck—an area of continual contention."
Subsequent to the invasion of Nihilanth's unnamed homeworld, Earth became the Combine's most recently known annexation. It was acquired directly after Earth's surrender at the end of the Seven Hour War. Following the standard Combine process, members of Earth's dominant species were modified to form a new arm of the Combine military. While these soldiers are primarily used as a permanent Combine garrison on Earth, in-game dialogue suggests that units of the transhuman arm of Overwatch are deployed across the Combine Empire. One line of dialogue supporting this theory contains a threat toward soldiers with "permanent off-world assignment" should they fail to complete their objectives.
 Combine on Earth
 Invasion of Earth
Following the Nihilanth's demise, the Combine were able to use the portal storm that was occurring at the time to continue on to Earth, where it launched a massive invasion that culminated in the Seven Hour War. Statements made by the G-Man suggest that the human race was unable to mount any effective resistance to the Combine armies, and that Earth's military forces were almost instantly overwhelmed. Former administrator of the Black Mesa Research Facility, Dr. Wallace Breen, negotiated a surrender on Earth's behalf and was therefore appointed the administrator of the Combine's forces on Earth - the Overwatch.
 Combine dominance on Earth
The Combine rules Earth from giant towers known as Citadels, the most important being in City 17 where Dr. Breen runs his administration. At the end of Half-Life 2, as Doctor Breen attempts to teleport off of Earth using the dark fusion reactor, a massive portal is created and, through it, several buildings that resemble Citadels are visible.
At the beginning of Half-life 2, the Combine appear to have almost complete dominance of the remaining pockets of civilized Earth, and do not identify who Gordon Freeman is. However, Doctor Breen immediately informs a Combine Advisor of Freeman's appearance during a teleport accident, in which Gordon appeared in Administrator's office for a brief amount of time. Only a few handfuls of rebels, loosely organized in a ragtag resistance, are secretly opposing the Combine. Gordon Freeman's actions after his return eventually inspire a massive insurrection against the Combine in City 17, which results in a full-scale street war between the Citizens and the Combine forces.
The reasons behind the Combine's desire to control the Earth are unknown, other than the absorption of Earth's resources, the use of human teleporter technology and the enslavement and exploitation of its dominant species - the humans - for either menial work or military service, considering that "permanent off world assignment" is threatened to soldiers who fail in their attempts to kill or capture Gordon Freeman throughout the game.
 Suppression Field
A symbolically empty playground in City 17
The Combine, since gaining dominance on Earth, imposed a Suppression Field on the population. The Suppression Field's main effect is to bring the human birth rate down to zero by prohibiting certain protein chains important to embryonic development from forming, effectively ensuring that the humans currently alive will be the last generation. Doctor Breen addresses this issue to the people via a broadcast during the early levels of Half-Life 2 as the response to a letter written to him by a "concerned Citizen" and claims that the field will be deactivated once the humans prove they no longer need it. During the game, Resistance members occasionally make humorous remarks about the Suppression Field, such as "When this is all over, I'm gonna mate." It was initially thought that the Suppression Field somehow prevented human sexual urges, mainly due to Dr. Breen's statement that it was suppressing "the urge to reproduce," but this statement may in fact be referring to the Suppression Field's physiological effects causing human "urges" to diminish rather than to stop outright. In the end, Combine propaganda may actually reflect the Combine's thoughts about human reproduction; they may indeed actually believe that they are there to help humans.
In Half-Life 2: Episode One, it has been revealed by Dr. Isaac Kleiner during his transmissions throughout the city that the Suppression Field has been disabled with the near destruction of the Citadel. He says that everyone who has escaped City 17 "should do their part" in the re-population of the human species "before the Combine attempt to restore their dominion." When Alyx Vance hears this, she remarks "Is Dr. Kleiner really telling everyone to...get busy?" Eli Vance would jokingly give Alyx and Gordon a similar suggestion, claiming to want grandchildren.
 Mind control
The Combine has a several methods of controlling minds of the populace, starting from soda cans, through Breencasts, and ending with Memory Replacement.
 Water supply control
One of the Citizens at the City 17 Trainstation remarks: "Don't drink the water...they put something in it, t-to make you forget. I don't even remember how I got here." The idea of drugging Citizens through water supply is reinforced by the numerous soda machines stocked with "Dr. Breen's Private Reserve", which freely dispense water in a standard 12-ounce can.
Large video monitors are mounted on walls in public places such as town squares and railway stations around City 17. They are used by the Administrator to deliver propaganda announcements - Breencasts - and messages to the Citizens, units of the Combine Overwatch and, later in the game, to address Gordon Freeman himself. The Breencasts are also broadcast in the home of Citizens via private televisions.
 Memory Replacement
A Combine radio transmission to Civil Protection officers states: "Reminder, memory replacement is the first step to rank privileges." This process is an important part of the transhuman operation as it results in a soldier completely devoid of human feelings and unable to rebel against the Combine. Memory Replacement devices can be seen in the Citadel during Episode One. The machine consists of Combine emitters and equipment, attached is an arm-like device holding a human body. Lastly, a shell-like apparatus envelops the head. Accompanying this model is a small group of sounds resembling harsh subliminal messaging. Effects of this brainwashing are so strong that none of the Overwatch units are willing to join the Resistance after the Uprising, defending the ruins of City 17.
The Combine heavily relies on imagery through logos, symbols, and propaganda posters to assure their influence on Earth and remind its residents of their presence. Combine units - humanoid and Synth - also bear insignias, logos, and other markings. Many Combine posters are also scattered around City 17 and its sector (including the Coast, Nova Prospekt, etc.). Most of the time they include two common Combine symbols, with variants in color and image backgrounds. The Combine imagery is quite abstract, and the intended messages can be very subtle.
 Human genocide
Graffiti sprayed near Black Mesa East
and other places (such as Matt
's home), with a humanoid being holding a baby next to the word 'Caste'.
There are many evident acts of genocide or at least random killing perpetrated by the Combine throughout the game. In Canals, a refugee base is raided, and a few members of the base are lined up against the wall and shot just as the player arrives. The town of Ravenholm was shelled with the intention of killing all the residents, and throughout the Highway 17 chapter, the player encounters numerous bodies in the houses of the coast including some that have been burnt by the Combine in a bonfire. Towards the end of the game, Eli Vance explains to Breen that he has witnessed "genocide and indescribable evil." The main purpose of Combine raids is to emphasize their dominance on Earth, and nip any resistance in the bud.
 The absence of children
The children are missing in Half-Life 2 and its episodes. The main reason is the placement of the Suppression Field by the Combine right after taking over Earth, which means the human population decline, and no birth in nearly twenty years.
Evidence such as the ghostly laughs and screams of children that can be heard in the playground outside one of the apartments in the first chapter, a crying couple that can be seen shortly thereafter, the fact that the player doesn't see any children in the most human-populated areas, remarks by Resistance members such as "I'm glad there's no kids around to see this," and the presence of discarded toys such as baby dolls can be seen during the game, being reminders of the past.
 Depletion of Earth's resources
The draining of Earth's oceans is easily the most striking sign of the Combine's rule on the planet.
It is evident at several points in the game that the Combine are depleting Earth's natural resources. One of the most noticeable signs is that the ocean levels have dropped dramatically. This can be seen during the coastal chapters Highway 17 and Sandtraps, and the waterways of City 17 in Route Kanal and Water Hazard. The coastline is littered with boats and ships resting on what was previously the seabed, and there are various docks and piers that are no longer standing in water. At the beginning of Highway 17, Gordon arrives at a harbor which is now a considerable distance from the water's edge. Indications of the previous sea level can be judged by moss which had previously gathered on harbor structures at the edge of the water, but which now lie several feet higher than the ground level. It is mentioned in the book Half-Life 2: Raising the Bar that this massive, planet-wide water drainage is accomplished through the presence of a giant Combine "drain," actually a teleporter, which sends the water to other Combine-enslaved planets.
More generally, the major part of the Earth's surface has become a Wasteland - a desolate, barren and hazardous region, inhabited with Xen wildlife, and littered with car wrecks, destroyed buildings and roads and other scenes of desolation; the only infrastructure that is maintained is the railway, which is used by the Combine to link their outposts together and to transport Combine troops, Stalkers and Citizens via the Wasteland Train. Additionally, City 17 itself is being devoured, as Combine Walls spread outward from the Citadel, consuming the city's buildings. Animals are rarely seen inside and outside of City 17, the only exception being birds, as they are present in large quantities.
Because of all of the above factors, even if Combine rule ends, extensive rebuilding, cleanup, and Xeno-extermination would have to take place to make the planet habitable again. Even then, it will not be the same as before the Combine invasion, as most of Earth's species have been driven to extinction by Xen lifeforms.
 Combine technology
 Combine teleportation
Despite the highly advanced technological capabilities of the Combine empire, the Combine seem to lack considerable skills in teleportation. Dr. Mossman explains that the Combine can only teleport from one universe to another, but not to different locations within the same universe. The teleportation method used by Dr. Kleiner and Eli Vance does this, which is why the Combine thirsts for their knowledge of teleportation. Dr. Mossman actually helps the Combine build a teleporter with such capability in Nova Prospekt, but it is destroyed during Alyx and Gordon's escape.
The Combine's method of teleportation requires a large amount of power and huge machinery to perform, as seen at the end of Half-Life 2 where Dr. Breen attempts to escape from the Citadel using a Combine teleporter. This device requires an entire reactor, called the Dark Fusion Reactor to power it, while the teleporters designed by humans require only small amounts of power and very little machinery in comparison. Moreover, unlike Xenian teleporters, which use Xen as a "dimensional slingshot," bouncing off of one universe to another, and from one location in a certain universe to another in the same universe, Combine teleporters have to "tunnel" straight through dimensions to the target universe. The advantage of this method is the ability to jump to any universe at will.
The lacking teleportation ability of the Combine also explains its interest in locating the Aperture Science vessel, The Borealis.
 Combine military technology
The Combine largely relies on the technological growth of others - machinery, resources, and representatives of the conquered species are assimilated for Combine use.
Combine Soldier fighting Antlions
along the Coast.
 Humanoid Combine units
The primary military force of the Combine on Earth is the humanoid Combine Overwatch, referred to by Doctor Breen as the "Transhuman arm of the Combine Overwatch",: humans who have been modified into "transhuman" (or "post-human", as referred to by Dr. Kleiner) cyborgs. They are the most frequently encountered foes throughout Half-Life 2. It is important to note that the Civil Protection foes are not hybrids and are in fact, human.
- Civil Protection: The quasi-thoughtpolice that patrols the cities, monitor the public airways, and conduct randomized raids. Since little modification is involved, some Resistance members, such as Barney Calhoun, join Civil Protection in order to go under cover to investigate Combine activity and tip off would-be victims.
- Overwatch Elite: The Elite soldiers of the Combine Overwatch. They've undergone extensive modifications and are seen protecting the Citadel or occasionally leading squads of regular soldiers.
- Stalker: Mutilated, drone-like slaves that are created from dissident Citizens and captured Rebels.
 Combine Synth technology
Strider and Combine soldiers attacking Freeman in the Citadel.
Synths are creatures that, over a course of imposed evolution and adaptation by the Combine, have come to fit a particular niche in the Combine military. Once organic creatures that lived on their own, they were enslaved and assimilated into the Combine to become the base of their military.
Various types of Synth have been brought over to Earth by the Combine. They were the primary forces used by the Combine during the Seven Hour War, as seen on the newspaper clippings on a cork board in Eli's lab.
- Dropship: Primary troop and weapon transport of the Combine.
- Gunship: Assault aircraft that usually fight in groups of two for protection.
- Hunter: A smaller and more agile version of the Strider, used as scout and escort.
- Strider: Large ground assault weapon used by the Combine. Walks on three incredibly long legs, towering over the battlefield.
 Combine organic combat technology
The only organic, non-synth weapon used by Combine is the Headcrab Shell, containing Headcrabs, and used primarily to flush out and destroy Resistance bases.
 Combine inorganic combat technology
Metrocop firing an Emplacement Gun on Rebels at Station 1.
A Hunter-Chopper in the Canals
The Combine, since gaining dominance on Earth, has invented a large number of devices and machines, some of which are offensive, and others which are used in the day-to-day policing and surveillance of the general populace. A majority of the Combine's technology present on Earth is actually nothing more than human technology re-interpreted and manufactured by the Combine using its own materials. Helicopters, automated gun turrets and wheeled vehicles are all examples of human technology re-engineered by the Combine.
- APCs: The main mode of transport of Civil Protection, are a common sight within the cities. They are armed with a missile launcher and a mounted pulse rifle.
- Autogun: An automated, stationary Combine pulse turret.
- City Scanner: A flying security camera and scout that takes pictures of enemies and relays their location to its command center. Also "dive-bombs" its target if subject to enough incoming fire. Occasionally used as a spotter for Striders.
- Hopper: A programmable explosive mine that hops into the air and explodes when approached by anything it identifies as an enemy.
- Hunter-Chopper: Piloted by two members of the Overwatch, this vehicle is primarily used to track down solitary members of the Resistance, or small groups of Resistance soldiers. Heavily armed and armored, it features a pulse cannon and missile launcher, and can saturate an area with mines.
- Manhack: Essentially a flying, autonomous circular saw.
- Rollermine: A ball-shaped 'mine' with a rudimentary targeting system that, once activated, follows anything it identifies as a threat and subjects it to electric shocks.
 Combine non-military technology
Barney covertly using the interface to inform Kleiner
of Gordon's arrival
Smart Barrier on the Trainstation Plaza.
The Combine uses a variety of devices which purpose isn't directly, or at all, military; they rather assists in overseeing Citizens or are used in controlling other machinery.
- Battery: A portable power source for several Combine devices, most notably the City Scanner.
- Binoculars: Telescope-like devices used to observe distant objects.
- Breencast: A regular propaganda broadcast made by Dr. Wallace Breen.
- Camera: A ceiling-mounted security camera.
- Charger: A wall-mounted generic power source.
- Citadel Core: A huge radioactive source of energy, located within the Citadel.
- Confiscation Field: A device quipped with four weapon strippers that confiscate and destroy unregistered weapons.
- Dispenser: A device used to distribute several types of things, mainly food.
- Elevator: An elevator used by the Combine mostly in the Citadel.
- Emitter: A device used as an indicator to any event, emitting a chosen light or sound.
- Energy Ball: A a concentrated sphere of Dark Energy plasma.
- Heavy Door: A door blocking access to important areas.
- Interface: A command panel used to control nearly all aspects of Combine technology\
- Light: A portable light source used to illuminate dark areas.
- Lock: A door lock used in addition to a door handle that mechanically prevents the door from being opened.
- Memory Replacement: A psycho-engineering device, used for transforming humans into Overwatch units.
- Monitor: A device used to view locations watched by one or several cameras.
- Power Generator: A Dark Energy-powered generator mainly found within the Citadel.
- Powered bridge: A type of force field platform used inside the Citadel acting as a means of reaching otherwise inaccessible areas.
- Prisoner Pod: A device used to contain prisoners and Stalkers.
- Razor Train: A train, custom-built to work on the existing human rail networks. It transports cargo, human prisoners, Overwatch Soldiers and Stalkers.
- Restrictor: a tall, monolithic structure used to deter Antlions.
- Security Door: A type of door used to block the three original Overwatch Nexus.
- Combine Smart Barrier: A large mechanized wall that uses powerful drive systems in tandem with heavy metal blocks to slowly expand outward and destroy existing structures in the way.
- Supply Crate: A crate containing health, ammunition, and energy equipment.
- Television: A human device used to broadcast Breencasts.
- Watchtower: A platform usually placed on the sides of defensive structures.
 Static Combine property
A common trait of Combine structural engineering seems to be making most of their creations resemble imposing, fairly featureless monolithic constructs, save for the odd irregular patterns that dot their surface. On the other hand, some seem to be unnecessarily complex, featuring inefficient use of open space, while others exhibit properties that defy conventional physics. The Combine also reuses existing buildings, customizing them to meet its needs.
- The Citadel: The headquarters from which the Combine governed the Earth.
- Barricade: A barrier used to regulate or completely deny access to certain areas.
- Bunker: A building used as outlying protection on Combine bases.
- Nova Prospekt: A facility to process and detain Citizens who were determined to be a threat.
- Overwatch Nexus: The center of Overwatch forces and operations within the City 17.
 Behind the scenes
- Originally, the Combine were to twist Earth's buildings to make them their own. This resulted in some odd designs, such as the Citadel interior being made out of ceramic tiles. This design was cut, and replaced with the familiar blue metal used by the Combine in the final games.
- During the development of the game, the Combine originally had a huge industrial facility which was referred to as the Air Exchange, which gradually absorbed Earth's air and replaced it with chemicals and other murky gases, harmful to humans.
The name "Combine" is used in the novel One Flew Over the Cuckoo's Nest by Ken Kesey, referring to the partly imaginary powerful force that controls everything. The name implies the mechanistic way in which the Combine manipulate and process individuals.
 List of appearances