''Warning: Here be heavy spoilers. More is to come.''


[[folder: Player Characters]]
!!'''Dr. Gordon Freeman'''


->'''Age:''' 27.
->'''Education:''' [=PhD=] in Theoretical Physics, [=MIT=].
->'''Employer and Position:''' Black Mesa Research Facility, Research Associate.
->'''Assignment:''' Anomalous Materials Laboratory.
->'''Clearance:''' Level 3.
->'''Administrative Sponsor:''' Classified.
->'''Disaster Response Priority:''' Discretionary.

->'''Voiced by:''' [[TheVoiceless Nobody.]] (No, [[Machinima/FreemansMind Ross Scott]] does not count)

The main hero of the ''Half-Life'' series, Gordon Freeman is, at the point where ''Half-Life'' begins, a recently graduated scientist who is about half a hour late for an experiment, taking place deep within the Black Mesa Research Facility. If only he had known that it would soon become the least of his worries that day...

Finding himself at the ground zero of a disaster, trapped between an invasion of aggressive creatures from the dimension Xen and a shadowy military force that wants him and his colleagues dead, Freeman manages to battle his way across the facility in the span of two days, staying alive against all odds, aided by his HEV suit and staunch determination. He is eventually teleported to Xen, where he takes on the leader of the aliens, after which he finds himself face to face with the mysterious G-Man, who offers him a job.

Displaced by G-Man in time and space, Gordon suddenly finds himself in the so-called "City 17", in some undisclosed part of Eastern-Europe two decades after the events at Black Mesa. He discovers that Earth has been conquered by an alien empire called "The Combine", who rules their new colony with an iron fist, and he quickly manages to run afoul of them and is soon hunted by their military. But he also finds out that some of his old friends from Black Mesa have organized a resistance group that fights against the regime, and that he himself has become a revered and famous figure for the rebels due to his actions at Black Mesa. Together with the resistance fighter Alyx Vance, he ignites a full-scale rebellion against the Combine, and manages to bring down their central control-center on Earth.

In the wake of the overthrow of the Combine control, however, Gordon and Alyx, along with the rest of the rebels, soon find themselves engaged in a even more bloody and desperate struggle to defeat the remaining Combine forces on Earth, and, even more importantly, preventing them from contacting the empire proper for reinforcements.

* TheAce: A brilliant scientist, expertly skilled in almost all conventional weaponry, and consistently successful. When the Rebels have lost all hope and need an army to turn the tide, they look solely to Gordon. ''And he succeeds''.
* ActionSurvivor: Despite his legendary reputation come the second game, he was really just an Average (really smart) Joe minding his own business at a government job who was really good at adapting when the Incident happened. Even when he wakes up in the Combine era, he applies his resourcefulness despite not really knowing what's going on.
* AsskickingEqualsAuthority: By the time of ''Half-Life 2'', he doesn't have any definitive rank in the rebellion, but he pretty much commands any rebel squads he comes across, who are all too willing to ZergRush a position if he so much as looks at it, all because he's good at killing things.
* BadassBookworm: He's a graduate of MIT with a [=PhD=] in Theoretical Physics; his doctoral thesis is ludicrously titled ''"Observation of [[OurWormholesAreDifferent Einstein-Podolsky-Rosen]] Entanglement on [[TeleportersAndTransporters Supraquantum Structures]] by Induction Through Nonlinear [[GreenRocks Transuranic Crystal]] of Extremely Long Wavelength (ELW) Pulse from [[YourHeadAsplode Mode-Locked Source Array]]"''. In laymen's terms... looking at teleportation effects on crystals when you fire lasers at them. Which suspiciously sounds like the experiment you are conducting at the start.
* BadassBeard
* BadassNormal: Regularly fights his way through augmented transhuman soldiers and super powered aliens.
* CrowbarCombatant: Provides the trope image.
* TheDreaded: He steadily builds up a reputation throughout his adventures in ''Half-Life''; by the midpoint of the game, the marines know exactly who he is and are actively hunting for him specifically. By the end, the Nihilanth is able to directly address him by name.
-->'''Nihilanth''': '''''FREEEEEEEEEEEEEEMAAAAAAAAAAN!'''''
* DidYouJustPunchOutCthulhu: At the end of ''Half-Life'', he takes down [[spoiler:the Nihilanth]].
** The Rebels' reaction when he takes down his first Strider, and in ''Episode Two'' where he takes out an ''army'' of them.
* DivineIntervention: Well, more like "reality-altering shapeshifting alien intervention" -- as much of a badass as Freeman is, there have been a few times where he should have died, or even ''did'' outright die, only for the mysterious G-Man to intervene and keep him alive for his own reasons.
* DudeWheresMyRespect: Averted. His reputation actually seems to do more work than him at times. He's definitely a badass by all standards, but his reputation reaches further than he does, inspiring and rallying the Resistance whether or not he does anything.
* FamedInStory: By ''Half-Life 2''.
* GeniusBruiser: The guy who blows up every Combine thing he sees happens to be a graduate of MIT, with a doctorate in Theoretical Physics no less.
* HelmetsAreHardlyHeroic: His HEV suit doesn't have a helmet, unlike those worn by the bodies of the other dead scientists found scattered around Xen.
* TheHero
* HeroicMime: The whole time.
** Exception would be when he was breathing during the Black Mesa Incident, if that counts.
** In ''Half-Life 2'', Gordon also utters mild grunts of pain sometimes when he's on fire or falls from leg shattering heights.
** Alyx lampshades it early on when they meet: "Man of few words, aren't you?"
* IconOfRebellion: In ''2''.
* ImplacableMan: Gordon Freeman didn't really ''mean'' to save the world by slaughtering hundreds of soldiers and aliens at Black Mesa. They were just in the way of the exit.
* InformedAbility: Gordon is a theoretical physicist, but the most technically complex things he does in the games are plug machinery in and solve rudimentary physics puzzles. [[FridgeBrilliance Of course, his young age most likely means he only got his Ph.D. a couple years ago at most, so he wouldn't have had time to rise very high in the Black Mesa hierarchy before all hell broke loose.]] Barney [[LampshadeHanging hangs a lampshade on that]] in the second game.
--> '''Barney:''' Good job, Gordon. Throwing that switch and all? I can see your MIT education really pays for itself.
* IronicName: Gordan '''Free'''man spends most of the series as a puppet of the G-man's machinations.
* LightningBruiser: He can take quite a bit of punishment, thanks to the suit, but can also run at ridiculous speeds and carry more firepower than the entire 2nd Armored Division.
* LivingLegend
* MeaningfulName: The Resistance and Vortigaunts often call him "The One Free Man", the name serving as inspiration in their own fight for freedom.
* MemeticBadass: InUniverse and out!
* MikeNelsonDestroyerOfWorlds: The entire Black Mesa Incident, specifically being told to force an alien crystal, that appeared out of nowhere, into the test chamber [[UnwittingInstigatorOfDoom that led every bit of the planet down under]]. Oh, [[spoiler:and [[VideoGame/HalfLife1 he killed off]] the LoadBearingBoss that was actively preventing [[NiceJobBreakingItHero the Combines from invading the planet]].]]
* OneManArmy: While his suit is a big part of it (it gives him about 4 times as much health as a regular soldier when fully charged, can automatically reload his holstered weapons, and applies morphine and other assistance to [[CriticalExistenceFailure keep him going at full strength even when badly wounded]]), it is still pretty amazing considering he is just a scientist.
** The best example is probably at the end of ''Episode Two''. [[spoiler: The rebel's main headquarters comes under attack from multiple directions. Dozens of Combine EliteMooks storm through the roof on dropships and set up numerous defensive positions, a bunch of [[LightningBruiser Hunters]] break in to support them, and a dozen striders, each supported by 2-3 Hunters, start attacking the base. After the rebel personnel get completely slaughtered, they just send Freeman, thinking that he's all they'll need to repel hundreds of heavily armed and armored dark energy rifle wielding super soldiers, and a bunch of giant tripod death machines supported by dozens of other, smaller tripod death machines. [[CurbStompBattle They're right.]] [[CrowningMomentofAwesome Completely.]]]]
* OneRiotOneRanger: By ''Episode Two'' the Resistance sees him as nothing short than an [[PersonOfMassDestruction unstoppable god amongst men]], and he's often sent into the fray alone or with minimal help -- not because of Resistance laziness or cowardice, but because Freeman ''consistently'' wins and thrashes the Combine in the process single-handedly.
* PoweredArmor: His HEV Suit.
* RedBaron:
** "The One Free Man".
** [[TheDreaded "Anticitizen One"]], to the Combine.
* RightManInTheWrongPlace: The TropeNamer, as described by the G-Man, but not an example, because he's being manipulated by the G-Man.
* SpecsOfAwesome
* TrainingFromHell: His first combat experience saw him go from being a mild-mannered scientist to becoming an ActionSurvivor of a bloody catastrophe that left many of his friends and colleagues dead whilst pitting him against the United States government, hordes of savage monstrosities, and an entire extraterrestrial empire.
* UnderestimatingBadassery:
-->'''Dr. Breen''': [[CondescendingCompassion How could one man have slipped through your force's fingers time and time again? How is it possible?]] [[UnderestimatingBadassery This is not some agent provocateur or highly trained assassin we are discussing]]. [[BigStupidDoodooHead Gordon Freeman is a theoretical physicist who had hardly earned the distinction of his Ph.D. at the time of the Black Mesa Incident...]] [[InspirationalInsult the man you have consistently failed to slow, let alone capture, is by all standards simply that -- an ordinary man]].
* TheVoiceless: Implied. It's actually left ambiguous whether or not he can talk.
* WeaponOfChoice:
** His trademark weapon is a red crowbar he found in a tool kit at Black Mesa. Alternatively, he's also depicted wielding a pump-action shotgun.
** From ''Half-Life 2'' onwards, the Gravity Gun.
* WeDoTheImpossible

!!'''Barney Calhoun'''


->'''Age:''' Unknown.
->'''Education:''' 2 years Martinson College, Undecided Major.
->'''Employer and Position:''' Black Mesa Research Facility, Security Guard.
->'''Clearance:''' Level 3.
->'''Disaster Response Priority:''' Preservation of facility equipment and materials
->'''Secondary Priority:''' Welfare of research personnel
->'''Low Priority:''' Personal safety

->Voice Actor: Mike Shapiro (''Half-Life 2'' and ''Episode One'')

The player character in ''Blue Shift'', Barney Calhoun was a security guard at Black Mesa, and arrived to his duties at the same time as Gordon. Unlike Gordon and Adrian, he was the only player character in the first ''Half-Life'' not to have a special suit, and the only main character to escape from Black Mesa on his own, along with a few scientists.

In ''Half-Life 2'', Barney, posing as a Combine Civil Protection security guard, saves Gordon from heading to Nova Prospekt. He helps Gordon fight for the Resistance in City 17, and in ''Episode One'', he helps some of the residents evacuate. Last seen boarding a train outbound from City 17 by the end of ''Episode One'' with the help of Gordon and Alyx, his whereabouts are unknown in ''Episode Two''.

* ActionSurvivor: His character arc in ''Blue Shift'' is simply surviving the incident and escaping the facility with some of the scientific staff. There's not even a FinalBoss for him to fight.
* AscendedExtra: From being a stock security guard in ''Half-Life 1'' to the star of ''Blue Shift'' to a major character in ''Half-Life 2''.
* BadassNormal: Moreso than any of the other player characters. He went through ''Blue Shift'' with only security guard equipment, and unlike Gordon and Adrian, he isn't under surveillance by the G-Man.
* CallBack: In ''Half-Life'', Barney invites Dr. Freeman to join him on the firing range and grab a beer with him. In ''Half-Life 2'', he mentions he still owes Freeman a beer.
* ConspiracyTheorist: Opening his locker in ''Blue Shift'' reveals that he's currently reading two books. One is actually titled ''Conspiracy Theories'', while the other is about aliens.
* CrowbarCombatant: Like Freeman, he stumbles across a crowbar during his trek through the wrecked portions of Black Mesa early in ''Blue Shift''. He uses it alongside his trusty pistol for most of the early segments of ''Blue Shift''. And it's implied that it's this same crowbar from Black Mesa that he hands over to Gordon at the start of ''Half-Life 2''.
* TheLancer: Fills the gap for Alyx in ''Half-Life 2'' during the chapter ''Follow Freeman!''
* NiceGuy: A trait he shares with most of the good guys.
* OneManArmy: In "Blue Shift".
* PrecisionFStrike: Gives one at the end of the chapter noted above.
--> '''Barney:''' And if you see Doctor Breen tell him I said "FUCK YOU!"
** Of course, [[SoundEffectBleep it's censored by Dog closing the entrance into the Citadel that you just entered]], but the dialog is intact in the game files.
*** Also, the subtitles censor a different portion of the word "fuck" than is covered by the audible crash.
* PutOnABus: More accurately, the second-to-last train to leave City 17 at the end of ''Episode One.''
* ReverseMole: Works within Civil Protection and uses it as a means to help civilians escape from the city
* RebelLeader: He seems to be the rebels ''de facto'' field commander, behind in rank only to Eli and maybe Gordon.
* SuddenlyVoiced: As typical for protagonists in the series, he's a HeroicMime in ''Blue Shift'', but he talks as an NPC in ''Half-Life 2''.
* TookALevelInBadass: Barney handles himself well in ''Blue Shift'' (even surviving through Xen, for one), but when we meet up with him in the second game, he's one of the leaders of the Resistance, their mole in Civil Protection, and once the revolution hits the streets, a competent field commander.

!!'''Corporal Adrian Shephard'''


->'''Age:''' 22.
->'''Training:''' United States Marine Corps, Special Forces.
->'''Assignment:''' Hazardous Environment Combat Unit, Santiago, Arizona.
->'''Mission:''' Classified.

->'''Voiced by:''' [[TheVoiceless Nobody.]]

The player character in ''Opposing Force'', Adrian Shephard was one of the men in his unit assigned to Black Mesa to do a full containment, cleaning out the witnesses, and finding Gordon Freeman. However, his transport was ambushed and shot down before he was given his mission, which leads him to work together with Black Mesa's scientists and security guards despite them becoming increasingly distrustful of him as the game progresses. In some of his attempts to escape and regroup with any members of his team, the G-Man both helped and hindered him along the way.

He was ultimately detained by the G-Man in AnotherDimension at the end of ''Opposing Force'', now pending further evaluation.

* BadassNormal: As with Freeman and Calhoun. In his case though, he manages to fight through and survive against a unit of trained Government agents ''and'' two simultaneous alien invasions.
* BeCarefulWhatYouWishFor: One of his diary entries from the game manual of ''Opposing Force'' has him saying that he wants to be part of a special reassignment and for a piece of action. And considering what happens once he's in Black Mesa, it's heavily implied that he regrets thinking this...
-->'''Shephard''':''"Another typically hellish day at base camp... I'll be glad when this is over and I can get assigned a mission. There has been this really weird civie spotted at the base. Rumor is he's from some government branch looking to recruit; others say he's with some secret research group. I would jump at the chance to join. It would be cool just for the change and the adventure."''
* BreakoutMookCharacter: In the main ''Half-Life'' game, the marines were just enemies to shoot at. In ''Opposing Force'', you play as one.
* ColdSniper: He receives training in the use of the M40 SniperRifle during boot camp, and manages to acquire one from the Black Ops late into the Black Mesa incident. And being the HeroicMime he is, all his kills with the weapon are done without him ever speaking a single word.
* CoolPet: One of his weapons is a Spore Launcher, which is a small alien he uses to shoot at bigger aliens. The reason it is considered a pet is that if the player is standing still long enough while equipping it, Shephard will actually pet it.
* DeusExMachina: Early in the game, Shephard is trapped in a room which is filling with toxic waste. The only reason he doesn't die is that the G-Man opens the door for him so he can escape.
* DiabolusExMachina: After fighting his way through hordes of aliens, Shephard finally reached the evacuation. The only reason he stays behind is that the G-Man closes the door to prevent him from escaping.
* TheFaceless: Has only two character art pictures of him, both with his gas mask on. His multiplayer image is just a generic HECU soldier.
* FingerlessGloves: Yet he [[FridgeLogic wears a gas mask]].
* GasMaskMooks: Based on his picture, he's constantly wearing a gasmask.
* HeKnowsTooMuch: The G-Man knows Shephard has probably witnessed too much, which is why he decides to have him detained, despite his employers wanting him killed for it.
* LongBusTrip: Despite the facts that ''Opposing Force'' ends with Shephard in a state from which he could easily be brought back, and Gabe Newell himself have stated that Valve is planning to "bring him back one of these days", no mentioning of him has been made in any of the ''Half-Life'' sequels.
* OneManArmy: Fought more Black Ops assassins and carried more weapons than Barney or Gordon.
* [[PetTheDog Pet The Spore Launcher]]: Shephard's idle animation indicates he really has a fondness for the thing.
* PoweredArmor: He wears a vest which requires power but can protect him against things which would otherwise kill him. In his training, the drill instructor even demonstrates this by firing a shotgun at him while he wears a fully powered vest.
--> "As you can see, you are not dead."
* SemperFi: Like the rest of the HECU, he's shown to be extremely determined with regards to fighting the alien threats and trying to find a way out of Black Mesa.
* SleptThroughTheApocalypse: He's rendered unconscious at the start of the game and only comes to around the same time as the HECU decides to pull out of Black Mesa.
* SpaceMarine: Downplayed. Adrian Shephard is never in space. While his branch of the Marines is explicitly reserved for fighting aliens, he and his comrades remain planted firmly on Earth.
* SuicideMission: After G-Man hinders his one chance of escaping from Black Mesa, he ends up going deeper and deeper into the bowels of the facility. In the end, he goes to fight the Gene Worm despite knowing he will probably die.
* WalkingArmory: Notable in that his weapons not only includes various types of guns but also alien lifeforms.
** WrenchWhack: One of his weapons is a Pipe Wrench.
** KnifeFight: Another of his weapons is a Combat Knife, which a quick enough player can easily use to kill both aliens and Black Ops agents.
** CoolGuns: The typical shotguns and machine guns.
*** HandCannon: The [[RevolversAreJustBetter Python]] from the original game is replaced with a {{Laser Sight}}ed Desert Eagle.
*** GrenadeLauncher: His sub-machine gun (assault rifle in the High Definition Pack) has an [=M203=] mounted on the underside.
** LivingWeapon: He has one alien what he can use as gun that shoots energy balls, another alien that he uses as a gun that shoots exploding green balls (see Cool Pet), and an alien which will viciously attack anything he throws it at. He also has one of those hanging barnacles which can be used as a grappling hook, but this last one doesn't count because it can't be used as a weapon.
*** The barnacle can be used on all non-boss enemies actually. It's just not a good idea as they'll be shooting/clawing you the whole time and it takes a few bites to kill larger enemies, particularly the aliens. It's effective on Headcrabs though.
** SniperRifle: Like the HECU snipers, Shephard has access to the M40 sniper rifle.
** [[GrenadeTropes Grenades]]
* WhatTheHellHero: Shephard inevitably gets snarked at by the scientists by the time it's clear he wasn't sent there to save anyone.
* YouRemindMeOfX: G-Man uses variant 1 towards Shephard, and mentions his ability to survive against all odds as the main reason. G-Man also mentions that this why he saved Shephard's life and argued against his employers' wishes to kill him.

!!'''Gina Cross '''


->'''Age:''' 25. [[labelnote:Note]]31 in unused files.[[/labelnote]]
->'''Employer and Position:''' Black Mesa Research Facility, Research Associate and Hazardous Environment Supervisor.
->'''Education:''' [=PhD=] in Bioengineering and Mechanical Engineering, Caltech. [[labelnote:Note]]Applied Physics in unused files.[[/labelnote]]
->'''Clearance:''' Level 4.
->'''Administrative Sponsor:''' Richard Keller. [[labelnote:Note]]Classified in unused files.[[/labelnote]]

-> Voice Actor: Kathy Levin

Dr. Gina Cross is one half of the protagonist team in ''Half-Life: Decay'' and a Black Mesa scientist. What happened to her after the events of ''Decay'' is unknown.

* ActionGirl
* AscendedExtra: A hologram of her as the Hazard Course Instructor appears in ''Half-Life'' and ''Opposing Force''. She can also be seen on security camera footage in ''Blue Shift'', and is one of the original multiplayer characters.
* UncertainDoom: In ''Opposing Force'', a body resembling hers is found near one of the Displacer's Xen teleport locations, and said body has the file name "Gina.mdl". However, it's worth noting that said model was a standard one from ''Half-Life: Deathmatch'', and was created before ''Decay'', so her fate is ambiguous at best.
* RedOniBlueOni: The Blue Oni to Green's Red Oni.

!!'''Colette Green'''


->'''Age:''' 31. [[labelnote:Note]]37 in unused files.[[/labelnote]]
->'''Employer and Position:''' Black Mesa Research Facility, Research Associate.
->'''Education:''' [=PhD=] in Electrical Engineering, Carnegie Mellon.
->'''Clearance:''' Level 4.
->'''Administrative Sponsor:''' Richard Keller. [[labelnote:Note]]Classified in unused files.[[/labelnote]]

-> Voice Actor: Lani Minella

Dr. Colette Green is one half of the protagonist team in ''Half-Life: Decay'' and a Black Mesa scientist. What happened to her after the events of ''Decay'' is unknown.

* ActionGirl
* BloodKnight
* RedOniBlueOni: The Red Oni to Cross' Blue Oni.


[[folder: Supporting Characters]]
!!'''Alyx Vance'''


-> Voice Actor: Merle Dandridge (''Half-Life 2'', Episodes ''One'' and ''Two'')

The heroine of ''Half-Life 2'', Alyx Vance helped Gordon Freeman time and again in his work with the Resistance. She also follows Gordon the whole way throughout Episodes ''One'' and ''Two''.

* ActionGirl
* {{Adorkable}}
* AmbiguouslyBrown: See MixedAncestry below.
* ArmorIsUseless: See MadeOfIron; bizarrely enough, she can survive much more damage than other human [=NPCs=] (bar Barney and Freeman himself), even though she's not wearing any kind of armor, just a jacket and hoodie.
* BadassInDistress: [[spoiler:In the initial ''Half-Life 2'', she gets bagged by the Combine during the revolt, and almost ends up sent through a Combine portal before Mossman saves her. In ''Episode Two'', she gets skewered by a Hunter and is rendered OnlyMostlyDead until the Vorts save her.]]
* BoyishShortHair
* ButNotTooBlack: Noticeably fairer-skinned than her father, commonly mistaken for a tanned Caucasian woman (even though she's half African-American, half Malaysian). In discussions praising notable People of Color in video games, she tends to get left off the list as a result.
* DeadpanSnarker
* {{Deuteragonist}}: Of the ''Half-Life 2'' series.
* DisneyDeath: [[spoiler:In ''Episode Two'' she gets stabbed in the back by a Hunter, and just manages to say "Gordon... help..." before she passes out, appearing to be dead. Her condition goes from critically injured to no pulse left just before the Vortigaunts manage to save her.]]
* ExpositionFairy
* FingerlessGloves
* {{Handgun}}: Her main weapon throughout the ''Half-Life 2'' series is a seemingly custom made machine pistol she carries around in her jacket.
* GiveGeeksAChance: She seems quite attached to Gordon. When her father Eli semi-jokingly tells her he wants grandkids while she and Gordon are both listening, leaving no doubt as to whom he envisions as their father, she laughs it off but doesn't actually appear disinclined to the idea.
* TheLancer: To Gordon for the Episodes.
* MasterOfUnlocking: Her EMP tool lets her get through a lot of places Gordon would otherwise be unable to reach.
* MadeOfIron: It takes an ungodly amount of punishment to kill her, and unlike Freeman and Shephard, there is no in-game justification for it.
* MessyHair
* MissingMom: Her mom died during the Black Mesa incident.
* MissionControl: Adopts this role occasionally (such as a couple times in ''Half-Life 2''), though she does a ''lot'' more of accompanying the hero into the field.
* MixedAncestry: She has a black father and a Malaysian mother. Applies to her voice actress as well (who has a black father and a Japanese mother).
* MyNaymeIs: Al'''y'''x.
* NerdsAreSexy: She's very knowledgeable about science and mechanics. Most of DOG is her work.
* NiceGirl: She's a serious contender for the title of "Nicest Companion In The History Of Gaming". Alyx is nothing but supportive of Gordon, commends him on pretty much every even slightly awesome feat he pulls off, protects him with her life without a second of hesitation, always asks him to be careful when the circumstances force her to send him to do something she can't do herself... At the beginning of Episode One, she's so overjoyed to see him alive she actually greets him with an epic first-person {{Glomp}}. Some time later, after Gordon single-handedly wrecks a gunship and then a Strider, she almost bubbles over with awe and names him her personal hero. It's also very apparent she really, really loves her dad and cares deeply about just about everyone else (especially Gordon, of course, whom she seems to have more than a slight crush on). She even gives a vortigaunt a peck at one point. Honestly, putting all the CrapsackWorld stuff around them aside, travelling with Alyx is basically one long CrowningMomentOfHeartwarming.
* PreAsskickingOneLiner: "Hah! No you don't!" ''[beats the shit out of four armed Metrocops in about five seconds]''
* PrecisionFStrike: She responds to [[spoiler: Mossman's attempts to justify her betrayal]] with "[[ShutUpHannibal Enough of your bullshit!]]"
* RescueIntroduction: She and Gordon meet when she saves him from a group of Metrocops.
-->[[PreAsskickingOneLiner "Hah! No you don't!"]]
* SecondaryFire: Her custom machine pistol is capable of both semi-automatic and automatic fire.
* ShipTease: With Gordon. Loads of it by various characters.
* SpitefulSpit:
-->'''Breen:''' ''[to Eli]'' Will you let your stubborn short-sightedness doom the entire species, or... ''[touching Alyx's face]''... will you give your child the chance her mother never had?\\
''She spits in his face.''\\
'''Alyx:''' How dare you even ''mention'' her!
* TraumaCongaLine: Where to start? For the first years of her life, she lives in the dormitories of Black Mesa, a [[NoOSHACompliance dangerous and accident-prone]] research facility. Then, her mother is killed during the Black Mesa Incident. She only survives because [[spoiler:the G-Man]] saves her life, putting her in his debt unknowingly. Fast forward to when she meets Gordon Freeman, leading to events in which her father is captured by the Combine. In the end, when the [[spoiler:dark matter reactor explodes, killing Breen]], she only [[spoiler:survives because the Vortigaunts teleport her out of the wreckage]]. In the beginning of ''Episode Two'', she is [[spoiler:stabbed twice by the long blades of a Hunter and survives, once again, because of the Vortigaunts.]] Finally, after [[spoiler:Eli, Magnusson, and Kleiner launch the rocket and Gordon and Alyx are about to get into a helicopter to save their friend Mossman, a pair of Advisors smash through the building and kill Eli right in front of her.]]
* UnkemptBeauty: She's famous for her MessyHair.
* WhyDidItHaveToBeSnakes: She seems to have developed a slight fear of [[spoiler:Hunters]] after [[spoiler:her near death experience]] in ''Episode 2''
* WrenchWench: She created D0g, after all.

!!'''Dr. Eli Vance'''


-> Voice Actor: Robert Guilliame (''Half-Life 2'', Episodes ''One'' and ''Two'')

A major character in ''Half-Life 2'', Eli Vance is one of the survivors of the Resonance Cascade incident, a lead member of the Resistance, and Alyx's father. Also known to be a Harvard graduate.

* AscendedExtra: Remember that scientist in ''Half-Life 1'' that sent you up for help after the Resonance Cascade and opened the door for you? That's Eli. Made more obvious in ''VideoGame/BlackMesa,'' the Source FanRemake.
* ArtificialLimb: Eli apparently lost his left leg during an [[NoodleIncident incident involving a bullsquid.]] He has a makeshift prosthetic now.
* DeadpanSnarker
* DistressedDude: One of the major goals driving the plot is Alyx's quest to rescue her father, twice.
* ISeeThemToo: So far, he has been the only character who has acknowledged the G-Man, a.k.a. "our mutual friend's" existence to Gordon.
* IWantGrandkids: Hey, you can't blame him, considering the Combine's anti-reproduction suppression field in the past ''twenty'' years.
* LikeASonToMe: [[spoiler:Shortly before he's killed by an Advisor]], he tells Gordon that he couldn't be more proud of him if Gordon were his own son.
* MyGodWhatHaveIDone: The personal cutscene between Gordon and him in ''Episode Two'' pretty much made him admit [[spoiler: he was doing oversight for the test leading up to the Resonance Cascade.]]
-->''"When he came in, I knew I should have aborted that damn test. [[ForWantOfANail But I didn't]]. The whole world went to hell that day."''
* RebelLeader: Seeing as Black Mesa is leading the resistance.
* SacrificialLion: [[spoiler: At the end of ''Episode Two'', right before Gordon and Alyx were to board the helicopter to find the Borealis, he is killed by a Combine Advisor by having his brain sucked out right in front of Gordon and Alyx.]]
* ShipperOnDeck: He's obviously quite fond of the idea of Gordon and Alyx hooking up.
* SoProudOfYou: Says this to both Alyx and Gordon [[spoiler:mere minutes before he's gruesomely killed by an Advisor. It's heavily implied he knew his end was coming and took the chance to secretly say farewell.]]



A walking junkpile that moves like a robotic gorilla, but has an effective mindset of a dog, hence his name. Fiercely loyal to and protective of Alyx, and her friends by extension.

* BadassAdorable: Has quite the endearing attitude when he's happy, but when he's on the warpath, he'll smash the utter shit out of anything that isn't a [[spoiler: Strider, where the ''only'' difference is that he'll take it apart with his bare hands instead.]]
* BigFriendlyDog: You play catch with him as part of Alyx's training regime for the gravity gun.
* TheBigGuy: He's the size and shape of a ''very'' big gorilla.
* CurbStompBattle: Him versus any Combine forces short of a Strider. His favored method is to pick up ground vehicles and throw them at the enemy.
* DavidVersusGoliath: [[spoiler: Him versus a Strider.]]
* LightningBruiser: He's more than capable of wrecking pretty much anything in his path. At the same time he's fast enough to keep up with a car going flat-out. When you race him to White Forest in ''Episode Two'' and don't make liberal use of your car's booster, chances are he'll be waiting for you at the gate when you finally get there.
* MyNaymeIs: [=D0G=] (with a zero) is written on his body shell. The in-game subtitles spell it "Dog" (with a letter o).
* RobotBuddy
* WhatAPieceOfJunk: Consider him a junky old robot at your own peril if you're a Combine. He ''will'' thrash you.

!!'''Dr. Isaac Kleiner'''


->Voice Actor: Harry S. Robins (''Half-Life 2'', Episodes ''One'' and ''Two'')

A major character in ''Half-Life 2'', Isaac was the man who recommended Gordon Freeman to Black Mesa Research Facility's Civilian Recruitment Division. Also a survivor of the Resonance Cascade incident at Black Mesa. [[RuleOfThree Was also]] Gordon's theoretical physics teacher at the Massachusetts Institute of Technology.

* AbsentMindedProfessor: Fits the stereotype perfectly, though he's not quite as absent-minded as some. In fact, more of the problems that come from interacting with him tend to be Lamarr's fault, rather than his.
* AdmiringTheAbomination: He's implied to be the scientist who finds headcrabs fascinating in the first game, leading to him ''keeping one as a pet'' in the second.
* AmbiguouslyJewish: Has a Hebrew given name and a German surname, and named his pet headcrab after a Jewish actress.
* {{Adorkable}}: There's just something so endearing about a quiet, timid old man who coos over a ''headcrab'' as if it were a sweet little kitten.
* AscendedExtra: Like Barney, he's a stock scientist from the original game turned into a main character in the sequel.
* BaldOfAwesome: He's almost completely bald, but still a highly capable scientist and a fairly entertaining fellow.
* CrouchingMoronHiddenBadass: The badass is hidden pretty deep down, but, he did manage to escape from Black Mesa alive and stay alive for years afterwards as a rebel. Plus, he somehow managed to catch a headcrab alive and surgically remove its zombifying fangs without getting turned into a zombie himself; give the man some credit for that.
* FluffyTamer: He keeps a 'de-beaked' headcrab as a pet. Her name is [[Creator/HedyLamarr Lamarr]].
* NiceJobBreakingItHero: It really wouldn't be inaccurate to lay the entire mess of the second game and its expansion packs on him. It was Lamarr who disrupted the teleporter, causing Breen to become aware of Freeman's restoration, which resulted in the Transhuman Forces being rallied, which led to... well, all of the death and destruction the player sees sweep before them over the course of the game. All because he had to keep a frigging untameable brain-sucking alien monster as a pet.
* NoodleIncident: It has to do something with the cat and the teleporter in his lab. Barney mentions the cat twice.
* PetsHomageName: His "de-beaked" headcrab is named after Creator/HedyLamarr.[[note]][[Film/BlazingSaddles That's Hedley!]][[/note]] It's both a bad StealthPun and a ShoutOut to a classic actress--one who helped pioneer early wi-fi and cordless technologies.
* TheSmartGuy: He does manage to create a short-ranged teleportation system that allows for transportation on the same planet. Something that the Combine haven't figured out themselves yet.
* VoiceOfTheResistance: Becomes one temporarily in Episode 1 when the Resistance hijacks Breen public broadcast system. It's mostly to give instructions on how to evacuate City 17, but he does take some time to give an inspirational speech about finally taking back the planet which is pretty impressive for someone who admits he's not very good at public speaking. [[MomentKiller Then he reminds everyone that the suppression field is down and now would be a good time to fuck.]]



Dr. Kleiner's de-beaked pet headcrab.

* FluffyTheTerrible: A formerly dangerous PuppeteerParasite named Hedy.
* HurlItIntoTheSun: [[spoiler: Last seen in the nosecone of a rocket launched into the Combine super-portal. If it's not dead its in another universe.]]
* NamedAfterSomebodyFamous: Named after Creator/HedyLamarr.
* TrademarkFavoriteFood: Watermelons, if a sticky note found in Kleiner's lab is any indication. Must be a good substitute for heads.
* UnwittingInstigatorOfDoom: Unwitting because it's a dumb animal, but thanks to Lamarr climbing into the teleporter, Gordon gets teleported into Breen's office and alerts the Combine to his presence.

!!'''Dr. Judith Mossman'''


-> Voice Actor: Creator/MichelleForbes (''Half-Life 2'', ''Episode One'')

The other scientist at Black Mesa East, and is somewhat distrustful of Alyx. Also [[spoiler:played traitor for Wallace Breen]], but after coming back to her senses, she eventually [[spoiler:saves Gordon, Alyx, and Eli from him]] near the end of ''Half-Life 2''. Was last seen with Resistance members tracking down the ''Borealis'', and got ambushed from the Combine before she could finish her message. She is still alive, whereabouts unknown. Her message was found by Gordon and Alyx, who were pursued by the Combine [[spoiler:for the entirety of Episodes ''One'' and ''Two'']] while delivering it to the scientists in White Forest Base. She will be most likely seen again in 'Episode Three''.

* BitchInSheepsClothing: Comes off as friendly and professional in her initial appearance, even if she doesn't get along with Alyx, [[spoiler: but she's secretly working for the Combine.]]
* FaceHeelRevolvingDoor: It certainly seems that way, considering how often she appears to switch sides.
* InkSuitActor: Looks quite a lot like Michelle Forbes.
* JerkWithAHeartOfGold: [[spoiler: Works for and against the Resistance so she can get close enough to Breen to kill him.]]
* TheMole: [[spoiler:Initially, but pulls a HeelFaceTurn]] later on. It's not clear if she's an example of [[spoiler:a FakeDefector]] or [[spoiler:WelcomeBackTraitor]].
* MyGodWhatHaveIDone

!!'''Dr. Arne Magnusson'''

-> Voice Actor: John Aylward (''Episode Two'')


The manager of White Forest Base. Has a very distrustful relationship with Isaac Kleiner (well, they fought between each other for grant money). Later revealed to be the owner of a certain microwave casserole in the lounge of the Sector C Personnel Facilities in Black Mesa.

* BrickJoke: Remember the casserole you had the option to blow up in the beginning of the first game? According to canon, that just so happened to be Arne's casserole, and Gordon did in fact blow it up, something Arne still hasn't forgiven.
* InsufferableGenius
* ItsAllAboutMe: Magnusson is an incredibly egocentric asshole. Listening to him alone, it's very easy to get the impression that he does ''everything'' there is to do while everyone else exists solely to annoy him or hinder his great accomplishments. During the final sequence of ''Episode Two'' he explicitly takes full credit for the success of the entire operation (including the brutal defence of White Forest against ''a dozen friggin' Striders plus their Hunter escorts''), completely ignoring the fact that he would've gotten nowhere without the invaluable support of scores of brave people, the player character among them, naturally.
* HateSink: Just read through the other entries of his character sheet.
* {{Jerkass}}: Specifically created to be this to contrast with Eli and Isaac
** DrJerk
** JerkWithAHeartOfGold: He is grateful for Gordon's part in the rocket launch, although he really seems to have difficulty expressing it (and even then he manages to mostly praise himself).
* RememberTheNewGuy: He just appears during ''Episode Two''. Sure, it's implied he hadn't seen Gordon in a long time, but it still appears as though they know each other.

!!'''Father Grigori'''


-> Voice Actor: Jim French (''Half-Life 2'')

Very little is known about him other than that he's a [[AmbiguouslyChristian Russian Orthodox-like]] preacher of questionable sanity who has taken it upon himself to clear his "[[ZombieApocalypse flock]]" from Ravenholm.

* AmbiguouslyChristian: His denomination isn't fully addressed even it's heavily implied to be Orthodox Christian in Ravenholm chapter.
* BadassBeard
* BadassNormal: All he has is his old fashioned rifle.
* BadassPreacher
* BaldOfAwesome
* CrazySurvivalist: Grigori's the ''nice'' kind.
* EvilLaugh: His laugh is pretty evil sounding, even though he's helping you.
* GoodSamaritan: Grigori is the only NPC in the entire game to help Gordon Freeman without recognizing who he is. He just thinks it's the right thing to do.
* GoodShepherd: While there are few people left in Ravenholm for him to help, he gives Gordon a shotgun, some supplies, and has built several traps that Gordon uses on the zombies. It is implied that Grigori has done the same for other rebels.
* HeroicSacrifice: He willingly stays behind to slow the zombie hordes down and allow Gordon to escape. Whether he actually dies is never made clear. See below under Uncertain Doom.
* MeaningfulName: "Grigori" is a term in Biblical apocrypha for a group of angels tasked with watching over humanity as well as the name of [[UsefulNotes/GrigoriRasputin another famous Russian preacher]] who was supposedly [[RasputinianDeath very hard to kill]].
* SanitySlippage: He's obviously insane, although it's implied that he was driven insane by the whole headcrab infestation in Ravenholm.
* UncertainDoom: The devs have stated Grigori will never appear on-screen again, so whether or not he's still alive is up to you.
* WeaponOfChoice: A .357 caliber lever action rifle called "[[ICallItVera Annabelle]]".

!!'''Colonel Odessa Cubbage'''


-> Voice Actor: John Patrick Lowrie (''Half-Life 2'')

A somewhat suspicious and supposedly British Resistance colonel, leading the New Little Odessa base along the coast. He only appears briefly in the 7th chapter of ''Half-Life 2'', granting Gordon a rocket launcher.

* CallBack: After playing out his minor role in ''Half-Life 2'', he disappears from the plot, and there is no mention of him again. Then, late in ''Episode One'', three independent mentions suddenly turns up concerning him, first Alyx sarcastically claiming he is her father, then two rebels coming to the conclusion that he is an idiot, and finally a rebel who reveals that he had taken the credit for Gordon's work, and who turns out to be an admirer of him.
* CowerPower: When the base he has responsibility to lead comes under an attack threatening its very existence, no less, Cubbage sends Freeman to dispatch the gunship, while he safely hides to send a warning to another base, that mysteriously never reaches its destination.
* MilesGloriosus: While there is no explicit mentions of his great military exploits, he does by no means seem like someone deserving a colonel title.
** Better yet, a passing comment in ''Episode One'' reveals that he took the credit for shooting down aforementioned gunship.
* MysteriousPast: The Prima Guide to ''Half-Life 2'' states that virtually nothing is known of Cubbage's past, his name may even be taken from the outpost, the only thing sure is his cowardice.
** If Gordon uses the Combine binoculars overlooking New Little Odessa, he can be seen talking to the G-Man.
* RebelLeader: Although how significant he is doubtable.
* SmallNameBigEgo: It is staggeringly clear that he believes himself to be one of the great heroes of LaResistance, although he appears to be the only one with this view, apart from one rebel in ''Episode One'' speaking somewhat highly of him.

!!'''Griggs and Sheckley'''


-> Voice Actor: John Patrick Lowrie (Griggs, ''Episode Two''); Adam Baldwin (Sheckley, ''Episode Two'')

A pair of resistance members in an underground base, they help Freeman defend the base against an army of Antlions to protect the Vortigaunts while they heal Alyx.

* DeadpanSnarker
* ProperlyParanoid: When Freeman arrives, Griggs thinks it's a bunch of Antlions. Turns out they're not that far behind.
* RedOniBlueOni: Griggs is the red, Sheckley is the blue.
* ThoseTwoGuys: [[WhatCouldHaveBeen They were originally meant to serve as]] [[ExpositionFairy Exposition]] RedShirts, but they were developed into actual characters who survive the battle.

!!'''The G-Man'''


-> Voice Actor: Mike Shapiro (''Half-Life 1'' and ''2'', Episodes ''One'' and ''Two'')

A strange character, looking like a blend between a government worker and a businessman, who apparently has some limited control over space and time. All we know is that he's been observing the events of the entire ''Half-Life'' series. And that he is possibly not entirely human. He apparently answers to some higher authority which he simply refers to as his "employers". He has, however, on a couple of occasions hinted that he does not necessarily obey these "employers".

* ActionSurvivor: Implied to be the case in one of the few allusions to his history:
-->'''G-Man''': I admit I have a fascination with those who adapt and survive against all odds. They rather remind me of myself.
* AffablyEvil: We actually don't know how much "evil" he is. But if he is, he's pretty damn proper about it.
* AmbiguouslyEvil: On one hand, his chessmaster antics, creepy dialogue, and mysterious powers make him easy to see as a villain of some sort. Plus, the Vortigaunts seem to oppose him and Eli suggests [[spoiler: he's the one who gave Black Mesa the crystal that caused the resonance cascade in the first Half-Life]]. On the other hand, we know absolutely nothing about who he actually is and what his motivations are, and he ''seems'' to oppose the Combine, who definitely ''are'' villains, and he has saved Freeman and Shephard's lives on several occasions.
* AmbiguouslyHuman: He obviously isn't, but we don't know ''what'' he actually is.
* AccentUponTheWrongSyllable: Although sometimes he accents the right syllable just with ''far'' too much emphasis.
* BlueAndOrangeMorality: For whom does he play? No one knows but him.
* CreepyMonotone: He rarely shows emotion.
** OOCIsSeriousBusiness: But when he does show even a ''hint'' of anger in ''Episode One'', it's bone chilling.
* CreepyShadowedUndereyes
* TheChessmaster: Although no one even knows what he is trying to accomplish.
* ChildrenAreAWaste: The G-Man seems to disagree, as he saved [[spoiler:Alyx Vance]] despite objections from his employers, presumably because he anticipated [[spoiler:the role she'd play in the future]]. They didn't want him to, because "[[spoiler:she]] was a mere child, and of no practical use to anyone." Well... how about now?
-->'''G-Man''': When I ''-plucked-'' her[[note]]He's talking about Alyx[[/note]] from Black Mesa... I acted in the face of objections that she was a mere child and of no practical use to anyone. I have learned to ignore such ''-naysayers-'' when... quelling... them, uh, was out of the question.
* ConsummateLiar: If the Nihilanth is to be trusted (which is a dubious condition, to be sure).
-->'''Nihilanth''': '''''Deceive you... he will deceive you...'''''
* DissonantSerenity: Always remains cool and businesslike no matter what chaos is occurring around him.
* GracefulLoser: Not ''necessarily'' a villain, but when the Vortigaunts foil some plan he has for Gordon, he is annoyed but doesn't retaliate; he simply waits for another opportunity to make contact, and does not seem to hold any kind of grudge against them for their interference.
* HumanoidAbomination: ''Maybe''. Standing still, he looks human. When he moves and where he appears tells you that he cannot be.
* IcyBlueEyes / CreepyBlueEyes: Look at those eyes. What the hell is up with those eyes.
* ImmuneToBullets: It is possible to shoot him at various points in the original game and its expansions. [[ShootingSuperman It just has no effect on him]], although since he's a plot critical character, [[PlotArmor he can't die anyway]].
* InexplicablyAwesome: One of the most intriguing parts of the G-Man is how little we know about ''anything'' about him, including how he does what he does, what he is, who he works for, and what he wants.
* InvisibleToNormals: He can apparently choose which persons are able to see him, and it is hinted that he also has some power over if they remember him or not afterwards.
* ISeeThemToo: The G-Man appears to be invisible to everyone but Freeman and Shephard at times (excluding cameos in ''Blue Shift'' and ''Decay''). However, the Nihilanth, Eli Vance, and the Vortigaunts are all also aware of his existence. Dr. Breen has also implied that he's aware of his employers, what the G-Man did to Gordon in the interim between the first and second games, and that Breen and/or the Combine may have also been involved in a bidding war for Gordon's 'services'. Breen was also implied to be among the "naysayers" who objected to the G-Man saving [[spoiler:Alyx Vance's]] life.
* LastSecondEndingChoice: What he does in ''Half-Life 1''. After Gordon has defeated the FinalBoss, the G-Man intercepts him, saying that his employers are very impressed with Gordon's work. He then offers to either employ Gordon, or throw him into a [[NonStandardGameOver battle that cannot be won.]] How Gordon responds is up to you.
* LackOfEmpathy: Debatable. He saves Gordon's life quite a few times and later [[spoiler: he admits he saved Alyx during the Black Mesa disaster]] suggesting that maybe he's capable of mercy. He also mentions to Shephard that he saved his life specifically because he sees him as a kindred spirit.
* MaliciousMisnaming: Always addresses Gordon as ''Mr.'' Freeman, putting extra emphasis on the "Mr." just to rub it in that he doesn't respect Gordon enough to use his proper title.
* ManipulativeBastard: From locking out Gordon and Adrian from certain doors, to shoving them in deep-freeze, yeah.
* TheMenInBlack: Doesn't quite fit the trope, but sure as hell evokes the basic concept, probably deliberately.
* NobleDemon: If we believe what he says, then he most likely saved [[spoiler:both Alyx and Shephard]] from his employers when it would have been easier to let them die.
* NoNameGiven: While he is called "G-Man" in the credits and character models, he is never actually referred to as this in-story. The only direct reference to him is Eli's label of "our mutual friend." As such, the G-Man is not his actual name or even an InSeriesNickname. In the manual for ''Opposing Force'', Adrian Shephard does call him "''a'' G-man" in his diary, but this seems to be a generic term.
* OffscreenTeleportation: Though there are ''two'' scenes where you get to see him do it: Once in ''Half-Life'' ("Lambda Core"), and once in ''Opposing Force'' ("Foxtrot Uniform"). Played straight several times in ''Half-Life 2'' and its episodes where he can occasionally be spotted in the distance, only to calmly walk away and disappear without a trace when approached. Even more glaring is his habit of appearing to Gordon literally out of thin air ''without'' using a visible portal, so...
* RealityWarper: Can casually stop time and plant subliminal orders into people.
* {{Retcon}}: He was originally imagined as the administrator of Black Mesa and a literal government agent, but in ''Half-Life 2'' the administrator role was given to Breen.
* TheSpook: All we know is that he's not human.
* SssssnakeTalk: In the first game. Averted in the second game and its expansions, although his speech patterns [[AccentUponTheWrongSyllable remain quite erratic]].
* TheStoic: Has a very emotionless demeanor, though he occasionally expresses slight amusement, and on one occasion the merest hint of anger.
* SufficientlyAdvancedAliens: As far as we can tell.
* TimeMaster: He seems to be able to stop time for his "employees" at the very least.
* UncannyValley: Invoked intentionally. WordOfGod states that he's to hint at something ''[[AFormYouAreComfortableWith trying]]'' to look human, but [[HughMann not bothering to try very hard]].


[[folder: Antagonists]]

!!'''Dr. Wallace Breen'''


-> Voice Actor: Robert Culp (''Half-Life 2'', cameo in ''Episode One'')

Breen is the earlier head of the Black Mesa Research Facility, and was unnamed and unseen in the first game, where he is merely referred to as "The administrator". In ''Half-Life 2'', he is the main antagonist and the Combine's puppet ruler of Earth, a position he got after selling out mankind to them.

* AffablyEvil: Breen's pretty well spoken and (mostly) calm for being a smug backstabber...
** FauxAffablyEvil: ... but he's also cold, dismissive, patronizing, and arrogant. Though he often covers it with a veneer of concern, friendliness, and approachability especially in his Breencasts the underlying disdain and indifference, even towards his allies, is unmistakeable.
* BeardOfEvil: Interestingly, it's rather similar to Gordon's beard.
* BigBad: Of ''Half-Life 2''.
* BodyHorror: DummiedOut from the original ''Half-Life 2'' script was that Breen himself was going to be turned into an Advisor. (In fact, the last conversation Breen has with an advisor has him complaining there's no way he could survive Combine space, and apparently gets a psychic answer, because he then reacts incredulously that the Advisors have a less-than-pleasant way for him to live.)
* BreakingSpeech: He's quite found of these such as near the end of ''[=HL=]2''.
--> '''Breen''': I'd like to take a moment to address you directly, Dr. Freeman. Yes, I'm talking to you. The so-called One Free Man. I have a question for you. How could you have thrown it all away? It staggers the mind. A man of science, with the ability to sway reactionary and fearful minds toward the truth choosing instead to embark on a path of ignorance and decay. Make no mistake, Dr. Freeman. This is not a scientific revolution you have sparked... this is death and finality. You have plunged humanity into freefall. Even if you offered your surrender now, I cannot guarantee that our benefactors would accept it. At the moment, I fear they have begun to look upon even me with suspicion. So much for serving as humanity's representative. Help me win back their trust, Dr. Freeman. Surrender while you still can. Help ensure that humanity's trust in you is not misguided. Do what is right, Dr. Freeman. Serve mankind.
* CorruptCorporateExecutive: He was the administrator of Black Mesa before becoming the Combine governor of the Earth, and pushed for the risky analysis that eventually led to the disaster in the first game.
* EvilOverlord: Of City 17.
* TheGhost: In the first game, he's just referred to as "The Administrator" a couple of times.
* HateSink: You will not find any other character in the ''Half-Life'' universe more unlikable than Breen.
* {{Hypocrite}}: In his Breencasts he says that "small minds" use the term "the Combine", and ostensibly eschews that label in favor of "Our Benefactors" and "the Universal Union"; but when you meet him in person he calls them "the Combine" himself.
* MisanthropeSupreme: His motivations are a wee bit unclear. He ''did'' convince [[TheJuggernaut The Combine]] to enslave rather than exterminate humanity (and was afterwards named Administrator of Earth), but whether he did so for personal power, or because he really cared about humanity is left unclear.
* {{Narcissist}}: He's got propaganda posters of himself in City 17 and even busts of himself in some locations including ''his own office''. Then there's the fact he's got jumbo screens of himself talking plastered all over the place.
* NeverFoundTheBody: We never really know what happened to him after the end of ''2'' when The Citadel is destroyed.
* NonActionBigBad: The final battle is against him, but it's the other soldiers and the gunships who are attacking you.
* TheQuisling: He refers to a genocidal race that owns a big chunk of the multiverse as "Our Benefactors", at least when speaking over the Breencasts.
* SesquipedalianLoquaciousness: Mildly. He's very eloquent and likes to use fancy or obscure synonyms for common words. It's like he reads thesauruses in his spare time.
* SmugSnake: Things escalate beyond his control rather quickly.
* SophisticatedAsHell: His speech is normally so impeccably erudite, that [[PrecisionFStrike the one time he swears]], it's ''glorious''.
* UncertainDoom: [[spoiler:At the end of ''Half-Life 2'', the platform lifting him up the teleporter collapses, and he seems to fall to his death. In ''Episode One'', a recording of Breen conversing with an Advisor suggests he may have become (or had a copy of his mind transferred into) an Advisor.]]
* VillainousBreakdown: He becomes increasingly impatient and childish as Gordon Freeman kills off his soldiers and starts a rebellion. When Gordon invades the Citadel, Breen goes from first trying browbeating him into surrendering, to frantically, but still condescendingly trying to reason with him, and finally he starts outright begging for him to stop. Later, while trying to escape via teleport, he resorts to juvenile taunting and mockery then goes back to begging when it becomes clear that Gordon's not playing around.
* WellIntentionedExtremist: Judging by the events of the Seven Hour War, he managed to stave off extinction. It was either Death or AFateWorseThanDeath. He chose the latter. Breen might honestly believe that the Combine will elevate humanity to the next level, though he has turned a blind eye to TranshumanTreachery by the Combine, and his behavior behind closed doors suggests that he may be in this purely for the power.
* WickedCultured: He shows a mild example of SesquipedalianLoquaciousness, and makes reference to advanced physics notions several times, but we're not sure exactly what his MorallyAmbiguousDoctorate is actually ''in''. In any case, everything about him, from his way of speaking to his bearing and his dress, screams "scholarly and cultured".

!!'''The Combine''', a.k.a. '''The Universal Union'''


A powerful trans-dimensional alien empire spanning thousands of galaxies, planets, and multiple universes, they conquered the Earth and are the main antagonists of the series. Their occupation force on Earth, the Overwatch, consists of a portion of their transhuman forces (modified humans using human vehicles and weapons), and "Synths", aliens who have been modified and outfitted with cyborg attachments and pulse weaponry.

* AliensAreBastards: Oh boy, where to start. Completely unprovoked and imperialistic conquest of an entire species (one of millions no less)? Check. Using [[PuppeteerParasite headcrabs]] as biological weapons to inflict a [[AndIMustScream horrifying fate]] on anyone who gets overtaken by one? Check. Ruthless lobotomization and forced cybernetic augmentation to their army of transhuman [[SlaveMook slave soldiers]]? Check. A literal 'beating quota' for Civil Protection officers? Check. Indiscriminate slaughter of unarmed humans [[UndergroundRailroad attempting to escape the city or help others do so]]? Check. Turning any [[LaResistance resistance members]] they capture into [[FateWorseThanDeath cybernetic slaves stripped of their humanity]] [[BodyHorror and most of their organs]]? Check. [[GaiasLament Steadily stripping the Earth of all its usable resources, up to and including the oceans]]? Check. Setting up a suppression field to [[ChildlessDystopia prevent all human reproduction, thus guaranteeing extinction within a century?]] Check. Honestly, the Combine could have codified the trope.
* AmbiguousRobots: Synths.
* ArtificialBrilliance: None of the Combine forces are stupid. The Overwatch soldiers will flank, throw grenades, and run to cover when reloading, the Hunters will use splash damage, flank, and lay down suppression fire, and the Gunships will wildly strafe while firing, and will even shoot down your missiles in mid-air. Foot-soldiers, however, do not have a high amount of hit points, and will usually get killed by the player before their strategies can kick in. Mostly averted by Civil Protection soldiers, who tend to stand in place firing away with pistols, which makes sense when you consider that they're beat cops rather than soldiers.
** However, they do fight very aggressively, meaning that once you've figured out their tactics it's fairly easy to fall back and ambush them.
* AuthorityEqualsAsskicking: The Combine Advisors are the top tier in the Combine hierarchy, or very close to it; they have the authority to subsume any Combine forces they need, and sacrifice them without a second thought. While they resemble blind limbless grubs the size of baby elephants, they have powerful [[MindOverMatter telekinetic]] and [[MindRape telepathic]] abilities, and are able to completely immobilize and control anyone around them, as well as levitate themselves for transport.
** They are also MadeOfIron. You actually briefly get a chance to shoot at one during the first stage of the assault at White Forest, using a mounted pulse cannon, which seems to be the Combine's equivalent to a .50 machine gun. Despite taking many shots, only a few of which are enough to kill PoweredArmor wearing cyborgs, the Advisor shows no visible signs of injury and escapes unharmed. This also shows the limits of their powers; the Advisor can't actually throw Freeman around like the previous ones did, only being able to give him a headache, likely because of the (not at all long) distance between them.
*** Likely an example of [[PlotArmor Plot Armor]] though. They deliberately have a massive amount of health in ''Episode Two'' (over 1000) to prevent the player from killing them during the brief windows of opportunity. They're likely going to be boss battles or scripted kills in the next game, like striders or gargantuas.
* BadassArmy: Well, they don't call it the Seven Hour War for nothing.
* BadassBaritone: The Overwatch soldiers speak this way by design.
* BigBad: Of the second game and subsequent episodes.
* LesCollaborateurs: The Civil Protection members are humans who willingly decided to work with the Combines. It is implied that while at least some of the volunteers has had somewhat sympathetic motives for joining up, such as better food and housing, many of them have done it for the power and brutality they are allowed to excise.
* ColorCodedForYourConvenience: The regular soldiers are colored gray and blue, and are relatively harmless. The Shotgun Soldiers, on the other hand, are brown and red and more dangerous. And then there's the Combine Elite (though his model is separate), who is white with touches of black and is the most dangerous.
* CreativeSterility: For all their advanced technology, The Combine Empire appears to be chronically unable to create something that is truly their own, original design. Every bit of their technology and utilities appears to have conceived by violently appropriating an already existing design from another race and then building upon, or rather twisting it until it serves the purpose they need it for.
* CurbStompBattle: The entire might of every military on Earth combined was utterly destroyed by them in just ''seven hours''.
* EliteMooks: The Combine Elites.
* TheEmpire: Possibly the best example. Most fictional empires would be satisfied with taking over the world or, at most, the galaxy. The Combine instead conquered ''the entire universe''. But then, even ''that'' wasn't enough, so they made portals to other universes and proceeded to conquer them too.
* TheEndOfTheWorldAsWeKnowIt: After the fall of C17, the Union is ''pissed'', and this is said to happen if the forces on Earth manage to call their empire for reinforcements.
-->'''Isaac Kleiner''': What you're seeing is the infancy of a superportal. If it attains full strength --
-->'''Eli Vance''': [[OhCrap It'll be the Seven Hour War all over again.]] [[InferredHolocaust Except this time, we won't last seven minutes.]]
* {{Expy}}: Of the Party from ''Literature/NineteenEightyFour'', only [[RecycledInSpace with aliens]].
* FakeUltimateMook: The Combine Overwatch may look big and scary, but the untrained rag tag rebels are actually better shots (strangely this only applies to SMG's, Rebels and Combine soldiers are on par in accuracy with the other weapons). The Overwatch soldiers are actually more effective in combat though because of their ability to throw grenades and their slightly larger amount of health.
* FascistButInefficient: Shockingly so. Despite being an empire that spans ''multiple universes'', encompassing countless galaxies, planets, and ''millions'' of different species, the Combine [[CripplingOverspecialization forgot to invest anything in worthwhile teleportation technology]]. Their travel methods are slow and inefficient considering the massive span of their empire, and their teleportation system, while functional, is actually ''less advanced'' than what Black Mesa designed.
** It can't be overstated how awful this is for them. It's explained that they can only teleport between dimensions, not within a dimension. Whether or not they have some sort of space fleet for travel is unknown, but what is known is that the destruction of the Citadel crippled their forces on Earth, as it not only knocked out their only source of transit to Earth and cost them their biggest base, it also resulted in their distress signal to their empire proper getting intercepted by the Resistance. This is why in ''Episode Two'' the Combine, especially the Advisors, become ''very'' desperate to obtain the Black Mesa teleportation technology. [[CaptainObvious You'd think a reliable method of teleporting among your galaxies upon galaxies of controlled territory would be one of the first things a multi-dimensional empire would develop]].
* {{Foreshadowing}}: At the very least, something much nastier than the Xenians was hinted at by the Nihilanth way back in the first game.
-->'''Nihilanth''': Their slaves... we are their slaves... we are...
* GasMaskMooks: Justified, in that Overwatch Transhuman troops are in use on other, non-human-habitable planets.
** Apparently the Civil Protection officers just wear them because it looks intimidating. Also Justified; this is something SWAT teams do in real life. Besides, given how brutal the metrocops are, it's probably best they remain faceless and anonymous.
* GreaterScopeVillain: Of the first game. Also in ''Half-Life 2'', while Breen acts as the BigBad, the Advisors are clearly above him and are seemingly the Combine's leaders.
* InsectoidAliens: The land Synths look like insectoids, while aircraft Synths look more like cetaceans or [[GiantEnemyCrab crustaceans]]. Made of metal. [[MoreDakka With guns]].
* InsignificantLittleBluePlanet: It's clear that they don't give two shits about Earth or the humans, considering the token force they've left to occupy it (with the majority of even the transhuman forces being used elsewhere) and the [[CrapsackWorld state of the planet]] after they're done draining it for resources. They've conquered millions of species, the humans are just one more to them.
** On the other hand, once they learn that the Rebels have developed simple and cheap teleportation (compared to the Combine teleporters at least), the Combine becomes immensely more interested in their activities.
* {{Leitmotif}}: [[https://www.youtube.com/watch?v=DUh8pyCmEwM "Combine Harvester"]], though sadly not used in the games. It's MusicToInvadePolandTo mixed with haunting alien noises.
* LoadBearingBoss: A collective, in-story version. For all the Combine's cruelty, they at least did manage to keep the massive Antlion infestations in check and keep headcrabs out of their cities. But then Gordon Freeman blew up Nova Prospekt, destroyed their defensive network of machine gun bunkers and 'thumpers' on the coast (thereby letting the Antlions into Nova Prospekt), slaughtered hundreds of soldiers and Synths, started a worldwide rebellion, and blew up the Citadel. All these things caused the Combine to lose control over City 17, resulting in a massive invasion by the nearby Antlion colonies and an infestation of headcrab zombies. By the time ''Episode One'' begins, the entire region is caught in a [[MeleeATrois four way struggle]] between the headcrab zombies, the antlion hordes, the Resistance, and the Combine.
* MiniBoss: Gunships and Striders.
* MechaMooks: The Earth Overwatch seems rather understaffed (likely due to most of the transhuman forces being shipped off-world), so make use of units like automated turrets, scanner drones, and manhacks to make up for it.
* MultiversalConqueror: According to WordOfGod, the Combine have already conquered several universes, enslaving their home species and forcibly modifying them for use as Synths. They're in the process of doing the same thing to Earth.
* OrganicTechnology: The Synth units.
* PlanetLooters: It's very clear that the Combine have ''no'' long-term plans for Earth. They're visibly just taking every resource they can use (including the ''oceans'', atmosphere, and some population) and shipping it off-world.
* PoliceBrutality: Civil Protection; some of their terror-mongering acts include beating people for no reason, shooting people after they surrender and lining up innocent people on walls and using them for target practice in true Nazi-Gestapo-meets-Soviet-NKVD style. Think of them as a world-wide example of the StanfordPrisonExperiment.
* PuttingOnTheReich: The Civil Protection and Overwatch uniforms were based on Soviet and Nazi designs. This was more blatant in the original concept art.
* TheSingularity: The Advisors have passed it, a ''very'' long time ago, according to WordOfGod.
* SesquipedalianLoquaciousness: Apparently as part of protocol, the Metrocops, Soldiers and even the [[VoiceWithAnInternetConnection Overwatch]] [[CannedOrdersOverLoudspeaker Announcer]] use medical jargon Newspeak to communicate. Alien intruders are "exogens", zombies are "necrotics", turrets are "sterilizers", soldiers are "stabilization delegates", Freeman, as Anticitizen One, is "malignant" and [[OhCrap contact with him]] is a "staph infection". Troops are also routinely issued orders like "inoculate", "shield", "clamp" and "cauterize".
* SlaveMooks: An entire army of them, most of the Combine soldiers you fight throughout ''Half-Life 2'' and its episodes are actually cybernetically modified and enslaved transhumans. Also, the "Striders" "Gunships" "Hunters" "Dropships" and "Synth Scanners" you see in-game are all enslaved aliens or biomachines. It's [[WordOfGod implied]] that there are ''millions'' of enslaved species. The vortigaunts may have been one of them, though they were later found to be enslaved by the Nihilanth. In fact, the Nihilanth's species' role in relation to the Combine is never really explained and neither is Race X's role.
* SufficientlyAdvancedAliens[=/=]TheJuggernaut: They curb-stomped the combined military might of every country on Earth in just seven hours. It took Dr. Breen to convince them not to ''exterminate'' every single human and settle for enslaving us instead.
* SociopathicSoldier: Surprisingly, not the Overwatch. They're just brainwashed slaves. No, the real sociopaths here are in Civil Protection, mentioned above in PoliceBrutality; the corps consists of humans who joined the The Combine's forces willingly, for perks like extra rations and sexual privileges. They appear to be somewhere between SWAT police and low-ranking soldiers. Their tasks are basically to instill fear in every citizen, and to brutally crack down on small resistance pockets. Their technology is notably a bit more primitive, as well. Where the Overwatch and Airwatch use Striders, Gunships and energy weapons, CP units make due with [=APCs=], patrol helicopters and sub-machineguns.
* StarfishAliens: The creatures running the whole thing, called "Advisors", resemble rhino-sized brain-sucking grubs with no eyes, arms, legs or face. The [[WordOfGod developers]] deliberately wanted to invoke the image of a species that passed its [[TheSingularity Singularity]] a ''very'' long time ago. They rely on mechanical arms and eyes for manipulation, and anti-gravity packs for movement. Well, those and their [[GameBreaker near-unstoppable]] [[PsychicPowers telekinetic]] and [[MindRape telepathic]] abilities.
* SuicidalOverconfidence: Part of their official policy. Any Overwatch soldier who fails and lives to report about it will receive "[[ReassignedToAntarctica permanent off-world assignment]]". Their destination is likely not pleasant.
* VestigialEmpire: Not the Union itself, but its occupation of Earth is quite low in maintenance. Some of their own structures appear to be rusting, and most of their much stronger Synth army was withdrawn in favor of human occupation forces long ago. While the rest of the Union thrives, it's made evident they don't care much about Earth or its integrity.
* WeWillWearArmorInTheFuture: Averted with the transhuman Overwatch soldiers, who wear kevlar-like soft armor that resembles modern riot gear with what look likes protective inserts, in contrast to the standard Sci-Fi plate armor with ShouldersOfDoom that most FPS soldier enemies tend to wear.
* WhiteMaskOfDoom: The Metropolice, although the Combine Elites are even worse.

!!'''Shu'ulathoi / Advisors'''


Rhino-sized, grub-like alien lifeforms. They led the Universal Union's Synth invasion of Earth, and now command the Combine forces stationed on Earth through Breen and the Overwatch, taking direct control in ''Episode 2''. The Vortigaunts are familiar with the Advisors, whom they call "Shu'ulathoi", having long been enslaved by them. They are ancient beings, extremely intelligent and powerful, possessing a variety of psychic and telekinetic abilities.

* AliensAreBastards: Our FirstContact resulted in them enslaving us and exterminating much of the population. Pleasant fellows, [[SarcasmMode aren't they?]]
* AlienInvasion: They led the Combine in their invasion of Earth, conquering the planet in only seven hours.
* AliensSpeakingEnglish: They can fluently communicate via telepathy in what seems to be a variety of languages.
* AncientAstronauts: Though they never ''technically'' visited Earth, according to WordOfGod they had been closely observing Earth for a very, very long time before they invaded. Not for us humans, but [[PlanetLooters for our natural resources]].
* AssimilationPlot: Every race the Combine conquers is either forcibly or willingly assimilated into their unified ranks. After Breen convinced the Advisors to not annihilate humanity, this has become their main goal.
* AuthorityEqualsAsskicking: It's unknown where exactly they fall in the Combine hierarchy, but Dr. Breen is completely subservient to them, as are all Combine-affiliated forces on Earth by extension. They're armed with extraordinarily powerful psychic abilities and end up directly commanding all of the Combine military force left on Earth by ''Episode Two''.
* BigBad: At the very least they oversaw the Combine invasion of Earth, and later rule over its occupation from clandestine stasis pods.
** GreaterScopeVillain: Revealed in ''Episode Two'' to actually be the ones who were in charge all along, not Breen.
* BlobMonster[=/=]StarfishAliens: Other than their long tongues, they have no discernible body features, appearing like a mass of grey flesh, resembling grubs.
* {{Cyborg}}: Apparently they aren't adapted to Earth's atmosphere (not ''yet'', anyway) and as such are outfitted with a wide variety of odd mechanical apparatus.
* EvilColonialist: Their entire motif is conquering then assimilating and/or enslaving all species they come across, or simply plundering their worlds for resources.
* EvilOverlord: Unclear how high in the overall Combine rankings they are, but they are the overseers of the Combine occupation of Earth.
* {{Expy}}: They're based on the Guild Navigators from ''Literature/{{Dune}}''.
* TheGhost: Their existence isn't known by anyone on Earth outside of the Combine's highest ranks and the oldest Vortigaunts; not even the folks of Black Mesa knew what they were. By ''Episode Two'', it's revealed that Breen was little more than a puppet for their interests.
* KillAllHumans: At first they wanted to wipe out the human race ''entirely'', viewing us as [[HumansAreInsects insects not even worth ruling over]]. Only through Breen's pleading did they reconsider this and settle for enslavement.
* {{Leitmotif}}: [[https://www.youtube.com/watch?v=D3d1cpWmL5U Plays alongside them, named after them.]]
** [[https://www.youtube.com/watch?v=DUh8pyCmEwM This even incorporates some of their own synthetic vocal noises, as if they're singing along.]]
* MarsNeedsWater: The main reason they invaded Earth, it seems, was to siphon our ocean.
* MasterRace: Often believed that they are the masterminds of the entire Universal Union, or at least part of the leading race.
* MindProbe: Their long tongues allow them to pierce through humans easily; WordOfGod suggests they can literally suck out human brains in order to interpret their knowledge and their memories, making it especially vital that Resistance leaders don't fall into their clutches.
* PsychicPowers: Telekinesis, Clairvoyance, Telepathy, Empathy.
** MindRape: Either through their vocal noises or through mind powers, they can induce debilitating, severely painful seizure-like effects on anything in their close proximity.
*** The graphic and sound effects used on screen when an Advisor is in close proximity gives a very realistic portrayal of what it's like to have a migraine. Don't get migraines? Now you know what it looks and sounds like to those who do.
* RealityWarper: Not on the same level as the G-Man, but they are capable of freezing time and space in a short area, and can manipulate this localized area at will.
* ReluctantRuler: For unknown reasons the Advisors remain in stasis up until ''Episode Two'', very rarely asserting control over Earth themselves and leaving most of it up to Breen. By ''Two'', however, [[VillainOverride they take direct control with a vengeance.]]
** Justified by meta-explanations of canon; the years that Earth had been under their rule, they were merely there to observe and not intervene, part of Breen's obligation to prove to them that humanity was worth sparing and integrating into the Universal Union rather than eradicating outright.
* SquishyWizard: They have strong psychic attacks, but they're easily dispatched in a physical fight by Dog, and can even be taken out by conventional fire.
* SuperIntelligence: As some of the oldest beings in existence, they've got the intellect, accumulated knowledge, and the administrative skills to control, or at least aid in running, an empire that stretches across multiple ''dimensions''. It's even implied that they mastered universal space travel at the same time as humanity was still in its Prehistoric era.
* VillainOverride: They remove Breen from power shortly before his death and assume direct command of the Combine occupation forces afterward.
* YouHaveFailedMe: After Breen's consistent failures against the Resistance and Freeman, it's made clear they no longer have any use for him.

!!'''Race X'''


A mysterious alien race from another dimension they only appear in ''Opposing Force'', where their invasion is repelled by Adrian Shephard, and finally ended when the US government nukes Black Mesa. Their main soldiers are the Shock Troopers but they also have other creatures at their disposal such as the Pit Drone, Shock Roach, Voltigore, Pit Worm, and Gene Worm.

* BigBadEnsemble: Form one not only with the HECU but also with the Black Ops later on.
* ChuckCunninghamSyndrome: Haven't been seen since ''Opposing Force'', and Marc Laidlaw has said that they were purely a Gearbox creation and don't figure into his thinking about the universe.
* EldritchAbomination: The Gene Worm is a gigantic monstrosity which has the power to convert any natural resource and by extension an entire planet in order to suit Race X's needs. It also houses an exit portal for reinforcements in its abdomen.
** The manual for Opposing Force implies that it's several miles long and that the portion you fight in-game is just its head.
* EyeScream: Shooting the eyes of the Gene Worm with the conveniently placed laser turrets blinds it...
** AttackItsWeakPoint: ...if blinded in both eyes it opens its midsection revealing a portal, making it vulnerable to attack.
* HairTriggerTemper: The Shock Roaches will attack anything close to them, including their own handlers (like Adrian). Heck, the idle animation shows Adrian teasing the Roach and it wanting to attack his fingers.
* MadeOfExplodium: The Shock Roaches also eventually explode after being released.
* MadeOfIron: Shock Troopers take about twenty [=MP5=] shots to kill, or just three Desert Eagle shots. That's twice as much as the average human soldier.
* PlanetLooters: Their goal regardless of origin and affiliation is all very much the same: conquer a planet while also plundering all of it's resources, and then terraform it so it can be of better use as a more suitable colony.
* ShockAndAwe: The aptly named Shock Troopers which carry a weapon called a Shock Roach, insect-like creatures that shoot deadly electricity. Also, Voltigores, large creatures which shoot powerful bolts of purple electricity.
* StarfishAliens: Even more so than Xen's occupants which is saying a lot. For example, Shock Troopers, in their infantile stage, are green amphibious fish-like organisms; by the time they reach maturity, they gain a humanoid stature, two pairs of arms, and have more in common with insects than fish.
* TheSpook: Infamously known for this. The only things we do know about them is that they're interested in conquering and colonizing other planets, and that they have already mastered teleportation technology. Even in-universe, the higher ups at Black Mesa didn't fully know about their existence despite the countless research expeditions made on Xen.
-->'''Security Guard:''' What is that thing, doc?
-->'''Scientist:''' I don't know, I've never seen that species before!
* UglyCute: InUniverse, Shephard seems to think so of the Spore Launcher, since he can't help but pet the cute thing (which is actually a larval infant of the Shock Troopers, according to WordOfGod.)



->Voice Actor: Michael Shapiro (''Half-Life 1'')

The ruler of the Xen aliens and the main antagonist of the first ''Half-Life'' (and by extension, ''Blue Shift'', ''Decay'' and part of ''Opposing Force''). His race was under severe threat from the Combine, being hunted to near extinction. Some time prior to the first game, he enslaved the Vortigaunts, who were further pursued by the Combine. To escape them, he and the Vortigaunts fled to the border world, Xen, where they set up shop. Still desperate, he used the Resonance Cascade to launch an invasion of Earth, and despite the Black Mesa's scientists' best efforts to plug the rift between the dimensions, he was able to use his psychic powers to force it to stay open. His forces had success with pushing back the HECU, but his invasion was ended when the Black Ops nuked Black Mesa and Gordon Freeman traveled to Xen and killed him, finally closing the hole in the dimensions.

* AlwaysABiggerFish: Invoked by Nihilanth. [[spoiler: He's undoubtedly talking about the Combine, or more specifically the Combine Advisors -- or who they're advisors ''to''.]]
* AmbiguouslyEvil: Mostly because we know so little about him; what we do know casts him in an ambiguous light. On one hand, he did enslave the Vortigaunts and invade Earth, with his forces being quite indiscriminate in their killings. On the other hand, the Black Mesa scientists had repeatedly invaded Xen to take apparently valuable crystals and specimens (including actually sentient soldiers in the Nihilanth's army), and Marc Laidlaw confirmed that the Nihilanth's invasion of Earth was largely an act of desperation, as his kind had been hunted to near extinction by the Combine. He also seems to care somewhat about Xen's ecosystem, given his apparent horror in the telepathic message he sends to Gordon after Gordon kills the Gonarch ("'''Doooone... what have you dooooone?"), and was the only thing keeping the Combine from invading our universe.
* AttackItsWeakPoint: The only way Freeman can kill the Nihilanth is to fire everything he's got directly into its brain. Even then, it takes quite a bit of damage.
* AuthorityEqualsAsskicking: Just like the Combine Advisors, he leads a large army and has very powerful telekinetic powers, which include the ability to teleport himself and others, telepathy, the ability to shoot extremely powerful balls of lightning, and levitation. His commanders and possible relatives, the "Alien Controllers", also possess these abilities, but to much less powerful degrees.
* BigBad: Of the first game, and by extension, ''Decay'' and ''Blue Shift''.
* BlackEyesOfEvil: His eyes appear plain black, unlike his underlings, whose eyes are red. He may not even have eyes, just holes where they should be like the Stalkers, but it's hard to tell.
* BodyHorror: In addition to his general creepy anatomy, he also has what appears to be amputation scars on his chest, slave bracelets, and mutilated legs that have been burned to vestigial stubs. But Marc Laidlaw denies that this is the result of being captured by the Combine, which is a common fan theory.
* ColorCodedForYourConvenience: His orbs all have distinct roles, and are distinguished by color and shape.
** Blue: Balls of energy that kill anything they come into contact with.
** Green: Teleports whoever it touches.
** Gold: Provides a powerful personal shield that protects him from damage.
* EnergyBall: Can launch dozens of energy balls at a time; they each deal a ton of damage, but they can be (barely) avoided with strafing because Gordon Freeman can [[RoadRunnerPC strafe at over forty miles per hour]].
* EvilSoundsDeep
* FatBastard: His torso looks a little more human-like than the other Xen aliens, making it somewhat noticeable that he looks overweight. This is likely the result of his legs being vestigial, and him floating around everywhere.
* FetusTerrible: What he looks like.
* FinalBoss: Of ''Half-Life''
* FlunkyBoss: One of the more annoying parts about the fight with him. He'll launch a green orb that either teleports you to another room or spawns some vortigaunts or [[GoddamnBats Alien controllers]] in his chamber. The second option isn't so bad, since he only spawns a few at a time, but him teleporting you to another room is very frustrating. In one instance, he'll teleport you to a room with a Gargantua, forcing you to have a boss fight ''in the middle of another boss fight''.
* {{Foreshadowing}}: His telepathic messages have a ton of this in regards to the Combine, the G-Man, Gordon, and possibly Breen and Shephard.
-->''[[GreaterScopeVillain Their slaves... we are their slaves... we are...]]''
-->''Deceive you... he will deceive you...''
-->''[[ISeeThemToo Alone... not you alone... not you alone]]''
-->''You are man... he is not man... for you he waits... for you...''
-->''[[WhatTheHellHero Done.. what have you done...]]''
* InterimVillain: Strange inversion; he's only the villain for the first game, but his defeat leads to the Combine finding Earth.
* LoadBearingBoss: Killing causes him to explode, which knocks Gordon out.
** Also one in-story; his psychic powers were the only thing keeping the portals between the Combine's universes and Xen closed. When he died, the Combine were free to pour through Xen, and then to Earth.
* LargeAndInCharge: The largest alien ever encountered in the series in terms of pure size. Even bigger than the three story tall tentacle monsters.
* LeaningOnTheFourthWall: Much like the G-Man and the Vortigaunts, most of his comments may be just as much about the player as they are about something in-universe, and open to many theories. For example, in the quote below, he is both the last of his kind, possibly the last thing keeping the Combine away from Earth, and the ''last boss''.
* MeaningfulName: WordOfGod says Nihilanth implies Nihilism. The -anth suffix relates to the flower-shape of this head.
* MyBrainIsBig: His head takes up over half of his entire body!
* PivotalBoss: He never moves from his point in the center of his room. Also...
* PowerFloats: Nor does he touch the ground.
* PsychicPowers: The only psychic seen so far, aside from possibly the G-Man, who can affect things on a planetary scale. He was able to keep open a dimensional rift, telepathically mind control an entire species, and, judging by what happened after he died, was powerful enough to trigger disastrous portal storms all over the Earth, resulting in Xen wildlife killing off most of Earth's native fauna. Compared to that, his personal combat abilities (which are still formidable) seem rather unimpressive.
* PuzzleBoss[=/=]DamageSpongeBoss: To actually damage him, you need to find out that he is using the crystals to regenerate his force field and destroy the crystals. After that, his protective orbs won't regenerate, and he can be killed, but it takes quite a bit of damage.
* SingleSpecimenSpecies: Justified, since he's...
** LastOfHisKind Said by the Nihilanth himself just before Gordon enters his chamber:
----> '''Nihilanth:''' '''...THE LAAAAAAST. I AM THE LAAAAAAST. I AM...'''
** The Alien Controllers, however, appear to be genetic crossbreeds between Nihilanth and vortigaunt. So at least in them his species continued to exist.
* ShockAndAwe
* StrawNihilist: Both his name and his cryptic comments to Gordon imply that he is a nihilist.
* {{Telepathy}}: He broadcasts telepathic messages to Freeman all throughout Xen, and can also use this ability to communicate with other Xen creatures.
* TurnsRed: Inverted. Throughout the battle with him, he will become progressively weaker as he gets injured until he finally just starts firing one ball of lightning at a time at you, as opposed to the dozens he fired before.
* WhatTheHellHero: Nihilanth is warning Freeman the ''entire'' game to ''cut it out'' ("Deceive you... will deceive you...", "Their slaves... we are their slaves... we are...", "The truth... you can never know... the truth...") [[spoiler: Basically, Nihilanth was the one thing preventing the Combine from invading Earth.]]

!!'''The [=HECU=] (Hazardous Environment Combat Unit)'''


->Voiced by: Mike Shapiro and Harry Robins (''Half-Life 1'')

The special forces unit who was sent to Black Mesa to clear up the aliens, it is soon discovered that they are also under orders to silence all the Black Mesa personnel... with bullets. They end up having to pull out, leaving behind dozens of their own troops in the process, while the Black Ops took over the operation.

* ArtificialBrilliance: They were praised as being the first tactically intellegent enemies in video games.
* BadassArmy: Consists of highly trained marines with a full repertoire of US Military hardware, including M1 Abrams tanks, M2 Bradley [=IFVs=], Apache attack helicopters, and even F-16 fighters. Unfortunately for them, they're a mere battalion-sized unit facing an entire alien invasion. Not to mention [[OneManArmy Gordon]] [[PlayerCharacter Freeman]].
* BandOfBrothers: Subverted and played straight. Many soldiers throughout ''Opposing Force'' are shown to care for their squad mates, but the same can not be said for many other members of the unit, particularly the commanders, who abandon several dozen soldiers in their attempt to escape from Black Mesa in blatant violation of the "Never Leave a Man Behind" policy. In fact, two of the soldiers refuse to turn Gordon over to their bosses because they don't want to see him alive after he'd killed so many of their compatriots.
* CavalryBetrayal: You rather quickly find out that they are not at Black Mesa to help the employees and especially not Gordon.
** They later end up [[LaserGuidedKarma on the receiving end of one]] when the Black Ops show up and start killing them along with the facility staff.
* ColdSniper: A handful of them wield sniper rifles in the original ''Half-Life''. [[PlayerCharacter Shephard]] himself can wield one of these rifles in ''Opposing Force'', and even receives specialized training for use of one beforehand.
* DrillSergeantNasty: The ''Opposing Force'' training level has one guide you through, quoting ''Film/FullMetalJacket'' the whole way.
-->"Where are you from soldier? ... "Texas"?! Holy cow! You know what comes from Texas, don't you?"
* FacelessGoons: The shotgun wielding ones wear balaclavas. However...
** GasMaskMooks: Most of them wear chemical warfare gear, such as gas masks, although the officers wear berets.
** Averted in ''Opposing Force'' for the most part, where they actually have their faces shown.
* FieryCoverup: Their mission.
* MoralMyopia: Two soldiers that capture Gordon seemed rather outraged at him for killing so many soldiers, even though 100% of those guys were trying to kill Gordon.
* {{Retcon}}: Originally, they were only called "soldiers" or "the military". They received their current name in ''Opposing Force''. In the original ''Half-Life'', their helicopters even had a US Army logo on them.
** Given this, and some other facts (HECU grunts are recognized as marines, land vehicles have Army markings, the F-16 is a plane used by the USAF) some fans have theorized that HECU is a multi-branch effort, like SOCOM in real life.
* MoreDakka: Many of their weapons, such as the M249 and Flash missile launcher. Hell, even their standard issue sub machine gun has a 50 round magazine.
* RadioVoice: They spoke this way, and it sounded extremely robotic. May have something to do with most of their EnemyChatter being MadLibsDialogue. Averted in ''Opposing Force'' to make them more relatable as Shepard's comrades.
* RedShirtArmy: Zig zagged. They're actually capable of soaking up more damage than the aliens thanks to their [[PoweredArmor PCVs]] and are more than capable of taking them in a fight. On the other hand, Gordon slaughters them by the score and their AI leaves a lot to be desired in ''Opposing Force'', where they can often be easily killed by Black Ops troops.
* SemperFi: They never seem to give up against you or the aliens.
* SociopathicSoldier: A few of them seem to take joy in killing innocent scientists.
-->"I've killed twelve dumbass scientists, and not one of them fought back! This sucks!
** PunchClockVillain: Most of them, however, just do what their commanders tell them to, as evidenced by various lines throughout ''Half-Life'' and ''Opposing Force''.
--->"[[NotWhatISignedOnFor I didn't sign on for this shit!]] Monsters sure, but civilians? ... who ordered this operation anyway?"
--->"Government cover-ups were ''[[NotInMyContract not]]'' [[NotInMyContract in my job description]]!"
* SuicideMission: After the Marines evacuate, they leave several soldiers behind. These soldiers, despite essentially being doomed men, still fight on to kill the more powerful aliens and therefore prevent them from ransacking Earth. Especially noticeable in "Opposing Force", when the corpses of dead marines can be found in the area where you fight the pit worm. Also in the final boss battle, when the security guard tells Shephard that some other marines went down to fight the Gene Worm and never came back.
* TheEngineer: He gets introduced in ''Opposing Force''. While engineers are meant to fix vehicles, the engineer in ''Opposing Force'' is more useful for just opening locked doors with his blow torch and fighting with his [[HandCannon Desert Eagle.]]
* TheMedic: ''Another'' class introduced in ''Opposing Force''. While he isn't very effective with his Glock 17 handgun, he ''is'' the only thing in the game that can heal your teammates.
* TheBigGuy: Yet another class introduced in ''Opposing Force'' is a tall, muscular soldier toting an M249.
* WhiteAndGreyMorality: Their main job is to prevent an alien invasion, which means protecting Earth. Plus, it is hinted at in their conversations that they mistakenly believe Gordon (and by extension all the scientists at Black Mesa) intentionally caused the resonance cascade.
--> "So, who is this guy, Freeman?"\\
"They say he was at Ground Zero."\\
"Science Team? You think he was responsible, sabotage, maybe?"\\
"Yeah, maybe. But one thing for sure is he's been killing my buddies."\\
"Oh yeah, he'll pay. He will ''definitely'' pay!"
* YouAllLookFamiliar: They had exactly four models in the original game, which just changed the head: the caucasian officer who wore a beret, the normal mook who wore a gas mask, the shotgun using soldier who wore a balaclava and goggles, and the grenade launcher using African-American soldier who wore no hat or mask, and smoked a cigarette. The latter was changed to simply being an African-American version of the officer with a mustache in the HD pack.
* YouHaveOutlivedYourUsefulness: They didn't think that their bosses would stop at killing the ''scientists'' because they saw too much, did they?

!!'''The Black Ops'''


A very shadowy unit sent to Black Mesa after the [=HECU=] failed their tasks, the Black Ops are there to remove ''everything'' in the facility, including the dozens of [=HECU=] stragglers left behind. [[spoiler: [[NukeEm In any way possible.]] ]] Their purpose is only explained in ''Opposing Force''.

* BadBoss: HECU soldiers find this out in a [[YouHaveOutlivedYourUsefulness bad way]].
* BadassArmy: See EliteMooks. Also, the fact that they never make noise is pretty impressive when they're being shot constantly.
* BlackHelicopter: They use black [=AH-64=] Apache attack helicopters, in contrast to the green ones used by the [=HECU=].
* CavalryBetrayal: Shephard, and by extension, the remaining HECU soldiers in Black Mesa, realize that they're not there to help them pull out, but are ordered to silence them along with any surviving Black Mesa personnel as well as the aliens.
* ColdBloodedTorture: In "Opposing Force", after defeating a bunch of Black Ops in a garage, you find an engineer who is bleeding and mortally wounded. You have to bring the nearby medic to him in order to save his life so he can open a door for you. It is clear the Black Ops tortured him for information.
* ColdSniper: Some of them have sniper rifles.
* DeusExNukina: [[spoiler:The way they eventually take care of Black Mesa.]]
* DoomTroops: the HECU may be a [[PunchClockVillain diverse]] [[JustFollowingOrders lot]], but these guys are a straight Legion of Terror.
* EliteMooks: In addition to being completely silent, the male black ops use powerful hand to hand moves at close range, run much faster than the marines, and have a little more health. The female black ops on the other hand prefer to flip and jump around wildly while pelting the player with pistol fire and kung-fu kicks.
* FacelessGoons: They all wear balaclavas, and the female black ops, as well as some male black ops, also wear night vision goggles.
** Lampshades in "Opposing Force" when one Marine refers to them as "masked freaks".
* FieryCoverup: Same mission as the HECU, except this time, their coverup also includes ''the HECU themselves''.
* FragileSpeedster: The female variant can move very fast, and do a lot of damage with their pistols to both Freeman and Shephard. However, they're easily taken down in one-two Magnum pistol hits.
* HighlyVisibleNinja
** Unless you play on Hard (at least in the first game), in which case [[spoiler: the female ones have {{Invisibility Cloak}}s]].
* {{Fanservice}}: The Female Black Ops had a very exaggerated breast bounce when they walked, never mind they wear absolutely [[SpyCatsuit skin-tight overalls]].
* LeaveNoWitnesses: And that includes the HECU marines doing the dirty work.
* LightningBruiser: Male Black Ops move much faster than their HECU counterparts, and are tougher to take down.
* {{Ninja}}: They are ninjas in all but name, complete with silent, fast movement and using karate kicks and punches at close range. Even their uniforms have a "kabuki stagehand" vibe to them.
* RadioVoice: Averted, even though you only hear them speak once (they're completely silent the rest of the time).
* SociopathicSoldier: Unlike the [=HECU=], played completely straight.
* VanInBlack: Well, M35 ''truck'' in black.


[[folder: Alien Species]]



-> Voice Actor: Lou Gossett Jr. (''Half-Life 2''), Tony Todd (''Episode Two'')

A race of peaceful aliens linked to something called the Vortessence. They were enslaved by the Nihilanth as factory workers and militia, and were one of the most common enemies in the original ''Half-Life''; after the fall of the Nihilanth, they were free to converse with humanity and, come the arrival of the Combine, join the Resistance.

* AliensSpeakingEnglish: Interspersed with their native language and phrases.
* BadassGrandpa: Think an entire race of Yodas. It's exactly as awesome as it sounds.
** In fact an EasterEgg in ''Half-Life 2'' leads you to one of them who lives like a HermitGuru, known in {{Fandom}} as the [[FanNickname All-Knowing Vortigaunt]].
* DeathIsCheap / BrainUploading: Apparently, via the "Vortessence":
--> ''"What seems to you a sacrifice is merely, to us, an oscillation. We do not fear the interval of darkness."''
* FateWorseThanDeath: The All-Knowing Vortigaunt states that Freeman did the enslaved Vortigaunts a favor by killing them.
* HeelRaceTurn: Since the original ''Half-Life''.
* HiveMind: Or at least an entire race somehow connected on a metaphysical level by the Vortessence. Whatever ''that'' is.
* MagicByAnyOtherName: They can shoot lightning, they can charge your suit, they can heal [[spoiler:critically-injured Alyx]], and power generators. And it's all just put down to "the Vortessence"
* NotAlwaysEvil: In the first game, they were typical {{Mooks}} for Gordon Freeman to mindlessly kill. It turns out, they were only fighting you because they were enslaved by the Nihilanth, and they help LaResistance in the second game and its episodes. (Sharp eyes at the time noted they were wearing control braces.) Whoops. The G-Man tries to make Gordon feel guilty about this later on.
* OneManArmy: You didn't think that the humans were the only ones with these, did you?
** X-8973 and R-4913, the two Vortigaunts from the UsefulNotes/PlayStation2 exclusive expansion, ''Half-Life: Decay''. They are noticeably more durable than standard Vortigaunts, have stronger and seemingly more developed electrokinesis, and can regenerate health by damaging enemies. Something of a downplayed example though, as they work as a team and only get to take down twenty or so soldiers in the small bonus chapter in which they appear.
** The three Vortigaunts in ''Episode Two'' who slaughter dozens of antlions, turning what used to be a tough HoldTheLine moment into a glorious CurbStompBattle. The one that accompanies you throughout the mines, nicknamed the Victory Mine Vortigaunt, is probably the best example.
* ShockAndAwe: Their primary attack is electrocution.
* SlaveMooks: In the first game, but then Gordon Freeman freed them from control of their alien masters.
* SlaveRace: They've been enslaved by both the Nihilanth and the Universal Union long before the events of the first game.
* SpellMyNameWithAThe: They ''always'' call you and Alyx "The Freeman and the Alyx Vance".
* StarfishAliens: They have at least four eyes. Also, they have three arms, lightning powers, and some sort of HiveMind (that may or may not overlap with the very (vort)essence of the universe).
* StarfishLanguage: Vortigese and the related "flux-shifting" ranges from a 'normal' spoken language to telepathy to a language where two vortigaunts have to talk ''at the same time'' to properly communicate.
* SuperStrength: While it is not as pronounced as the strength of the Grunts, they still have it. The very first time you encounter one, it breaks down a 20mm thick heavy metal door with a few hits, with the door being reduced to pieces.
* TookALevelInBadass: In the first game, they were disposable mooks, slaughtered in droves by Freeman and the soldiers. By ''Half-Life 2'', they're much more powerful combatants (individually about on par with the original's Hard mode Vortigaunts) and have gained new mystical abilities including, at one point, resurrecting someone from the dead.



Parasitic alien lifeforms. Originally from an unknown dimension far from Xen, they were eventually brought there by the portal storms. After the Resonance Cascade and the following portal storms, the headcrabs migrated and set up shop on Earth. Their most notable quality is their ability to turn humans (and possibly other creatures) into Zombies by attaching to their heads.

* BodyHorror: For unknown reasons headcrabs mutilate a persons body, possibly because as a parasite they are draining its "resources". Standard Zombies have their ribcages open like teeth and their organs are on display. The bloodied faces of the victims aren't much better.
** It gets worse with elite zombies. Fast Zombies look like all of the flesh save the bare muscle is gone and the poisonous zombies have a smashed in looking "face" and a back that appears to have been eaten away.
* ButtMonkey: In a way they are this, even if they are creepy. They are usually getting obliterated by both Combine and rebels and even the game actively encourages you to kill them in "creative" ways such as throwing saws, using traps, or setting them on fire. Of the four factions competing for control by the end of ''Half-Life 2'', they are probably the weakest, with their only saving grace being their sheer numbers.
* EliteMooks: In the first game, there were just basic headcrabs and zombies. The later games introduce new forms.
** ''Opposing Force'' has the gonome, a mutated version of the standard headcrab zombie. Not only does it have more health than a normal zombie, but it can throw some sort of projectile and sprint.
** ''Half-Life 2'' introduces the fast headcrabs and poison headcrabs, as well as their accompanying zombie forms.
* FaceFullOfAlienWingWong: Which causes Barney to refer to them as "head humpers".
* FateWorseThanDeath: Headcrab zombies can be heard crying out in pain, and playing their audio backwards reveals a large amount of dialogue such as "God Help Me! Help me!" or "Get it off me!" This heavily implies that headcrab victims are aware of what's happening but unfortunately there is no way to remove headcrabs [[MercyKill without killing the victim]].
* FragileSpeedster: Invoked for all of the variants, of course.
** Fast headcrab zombies are the fastest ones by far, and are arguably the most dangerous for this reason. However, they have no more health than a standard zombie, and so are only a big threat in large numbers and [[GoddamnedBats being pretty annoying as well]].
* GlassCannon: While the Poison Headcrab may be durable as the regular and it's fast variants, it can drain the player's [[HpToOne health to 1 HP]] and thus, leaving the player vulnerable to other enemies.
** {{Nerf}}: As in the 2010 update, the Poison Headcrab, when alone, is no longer capable of killing the player.
* TheGoomba: Both the zombies and the headcrabs themselves, with the former being almost a complete non-threat due to their slow speed, low health, and weak attacks, and the latter dying in one or two hits from just about anything and doing next to no damage.
* HellIsThatNoise: Headcrab noises are all horrible, whether alone or from a zombie. Special mention has to go the poison headcrabs which make three distinctive noises: a disarming chirping noise, a rattle that sounds like a rattlesnake rattle, and when they attack they let out a horrible high-pitched scream that sounds almost human.
* KingMook: Gonarch.
* MascotMook: They've become this due to being unique but common enemies.
* NotSoHarmlessVillain: Due to how easy it is to kill them it's easy to forget just how dangerous they can be. For proof just look at [[BleakLevel Ravenholm.]]
* PersonalSpaceInvader: They have a habit of flinging themselves at people's heads.
* PuppeteerParasite: They effectively replace their victims heads, controlling their every actions. There seems to be enough of their hoists mind left [[FateWorseThanDeath to be horrified at their predicament]].
* ZergRush: Zombies are fond of this tactic in Ravenholm and City 17, post collapse of the Sector 17 Overwatch.
* ZombieApocalypse: Can cause this if they show up in large numbers. See Ravenholm.



Large, insect like creatures that migrated to Earth following the portal storms. They seem to operate much like many Earth insects, living in extremely large colonies with other antlions. After the events of ''Half-Life 2'', the street war between the Combine and the Resistance has caused a breakdown of the Combine defenses, and the antlions have started pouring in to civilized areas.

* CannonFodder: Antlion soldiers. The most commonly encountered ones by far, they pretty much just charge and attempt to bite/claw whatever is threatening the colony with little regard for personal safety. Good thing they're extremely numerous.
* DefeatEqualsExplosion: Antlion workers explode when they die, shooting acid everywhere.
* EliteMook: Antlion workers, which use their wings to jump around more often, have twice as much health as Antlion soldiers, and spit acid with deadly accuracy.
* EvilVersusEvil: Their presence is quite a help to the Resistance, as it gives the already overstretched Overwatch occupation force something else to shoot at.
** Though to be fair, they're not evil so much as animalistic. Once Gordon gets the pheremones, they're actually pretty helpful allies.
* {{Expy}}: Especially the basic soldiers look and behave ''a lot'' like the Bugs from the [[https://en.wikipedia.org/wiki/Starship_Troopers_(film) Starship Troopers]] movies.
* GiantMook: Antlion Guards, which can soak up bullets and grenades like a sponge and punt [=APCs=] with a headbutt.
* MadeOfPlasticine: Antlions are the only enemies in ''Half-Life 2'' that can be gibbed.
* MamaBear[=/=]PapaWolf: Don't mess with their grubs. Seriously, don't.
* InsectoidAliens: They greatly resemble giant beetles. Their grubs also resemble giant maggots.
* UnstoppableRage: If you mess around with Antlion grubs, the Antlion Guardian will. Get. Pissed. Th Guardian that appears in ''Episode Two'' actually [[RoaringRampageOfRevenge leaves the nest to hunt down and kill]] Freeman in revenge for breaking in and killing their young.
* ZergRush:
** During ''Half-Life 2'', they have a tendency of doing this -- they push the player onto the sand, summoning more Antlions.
** During ''Episode Two'', they do this once Gordon reaches Griggs and Sheckley's hideout. Fortunately the forementioned rebels are quite adept at killing them, not to mention they have two turrets.



Large, stationary creatures that wait on the ceiling for prey to wander in range, where upon they grab their prey with their tentacle and pull it up into their mouth.

* ExtremeOmnivore: They'll eat just about anything organic, from humans to antlions to birds. On the other hand, should they pick up something they cannot eat such as wood, they'll chew it a little, get frustrated and spit it out.
* GlassCannon: Despite it can be killed easily with any conventional weapons, the Barnacle can mow down an NPC including the player in few seconds while chewing in the first game. While in it's sequel, it will [[OneHitKill instantly kill an NPC]] via NeckSnap. However, the Player can take [[CherryTapping 10 damage points per bite]], thus giving the latter enough time to whack the said beast.
* NeckSnap: How they instantly kill non player characters in the second game. Freeman is immune, possibly due to his HEV Suit.
* OverlyLongTongue: Weaponized, as they wait for prey to wander into their dangling tongues and drag them up to devour them.

!!'''Alien Grunt'''


The backbone of the Nihilanth's Xenian army in the first ''Half-Life''. The Grunts are tall, bipedal, muscular creatures with multiple red eyes, backward jointed legs, tube ears, vertical opening mouths, and an arm sticking out of their chest, similar to the Vortigaunts. They make up a large part of the invasion force during the Black Mesa Incident, where the Nihilanth's forces squared off against the HECU.

* BeeBeeGun: Their weapon, the Hivehand, which shoots alien "thornets", which are less like bees, and more like flying, poisonous, heat seeking armor-piercing daggers of death that can find you ''anywhere''
* {{Cyborg}}: Their armor and weapons look like they have been surgically grafted on to their bodies, and the Grunts themselves are artificially created in a factory.
* DumbMuscle: Averted. While their strength is mainly emphasized over their smarts, they clearly use strategy in their skirmishes. They use tactics such as firing their Hivehands to track those hiding behind cover and running between cover themselves when the opportunity sees fit.
* EliteMooks: They're much more dangerous than Vortigaunts, the other foot soldier of Xen in the first game, due to their high health, heat seeking projectiles, and armor.
* NoSell: Shooting the armored parts of the Grunts will simply do no damage at all if you shoot them with a pistol, shotgun, assault rifle, or even an uncharged Tau Cannon. Oddly enough (and good for the player), their armor is placed just about everywhere ''but'' the Grunt's torso, the most likely place it is to get shot.
* MultiArmedAndDangerous: Continuing the Xen theme as seen in Vortigaunts and Controllers.
** This isn't all they share; like the Controllers, they also have the Vortigaunts' red eyes, vertical opening mouths, backwards jointed legs, hoofed feet, [[HumanoidAliens bipedal posture, two legs]], and claws (well, on their third arm at least).
* MoreTeethThanTheOsmondFamily
* OrganicTechnology: Their main weapon, the Hivehand, mentioned above, is a textbook case. This trope applies to the Grunts themselves, as they are a...
* ServantRace: Towards the end of the game, you can find a factory run by Vortigaunts, with several barrels on an assembly line. Opening these barrels will reveal Alien Grunts- the implication being that the grunts are a manufactured species. This fits with the bio-technology theme of Xen.
* SuperStrength: In various scripted scenes, they're seen doing things like prying open steel doors with their bare hands, or punching marines through walls.



The tanks of the Xen forces. The Gargantua is a twenty foot tall blue creature with an armored shell, two vestigial arms, two functioning arms, and one large eye. Their main arms have pincers that can open to emit jets of blazing heat. They only appear a few times, but you ''will'' remember them.

* AmbiguousRobots: Their seemingly metallic skin and built in weapons makes one wonder. They actually share a few traits with Combine synths.
* {{Cyborg}}: Possibly. It does look pretty mechanical. Special mention goes to its built in weapons, glowing machine-looking eye that changes colors, and armored metallic skin. Not to mention the way they explode.
* DeathFromAbove: How one is taken out in ''Forget About Freeman''; Freeman calls in an air strike on it, and the HECU aircraft, not knowing who sent the signal, are happy to oblige. Cue exploding Garg.
* KillItWithFire: They have flamethrowers built into their arms.
* MadeOfIron: Bullets just bounce harmlessly off their skin. It takes a TON of explosive or electrical damage to actually put them down, more than the actual M1 Abrams tanks in the game. Even more so in the mod ''Videogame/BlackMesa'' (a recreation of ''Half-Life 1'' in [=HL=]2's engine), where there is absolutely no conventional way to kill them, even with all the explosives the player can carry; they can only be taken down with scripted sequences.
* MeaningfulName: '''Gargantua''', as in it's an absolute behemoth.
* MiniBoss: They serve this role whenever they appear in the original ''Half-Life''; they're very tough, and half the time are meant to be taken down in scripted sequences to boot, but don't last as long and aren't as powerful as the actual bosses, of which there were only three (the [[PuzzleBoss Tentacle]], the [[DamageSpongeBoss Gonarch]], and the [[FinalBoss Nihilanth]]).
* NaturalWeapon: They can open their arms to release streams of fire/plasma/something that's powerful enough to actually reduce a human to LudicrousGibs rather than just burn them. They're also fond of simply crushing their enemies, or shooting a weird energy beam by stomping on the ground that can seek out targets and, again, gib them.
* PuzzleBoss: Every one you meet is intended to be taken out using the environment in some way. You ''can'' kill them with weapons, but it requires almost your entire inventory of explosives to do so.
* RedEyesTakeWarning
* TheJuggernaut: Bullets don't do a damn thing against it what with its metal carapace, and even if its still susceptible to both energy weapons and all explosives it's going to take a lot of ammunition to bring it down. It also still says a lot when the only things to one shot it are very strong discharges from a power station or a direct hit from a mortar strike, both instances being very coincidental.
* WalkingTank: Notable because they actually resemble a giant version of the primary Xenian heavy infantry unit, the Alien Grunt. Both are bipedal, both have backwards jointed legs, hoofed feat, red eyes, multiple sharp teeth, and two arms ending in weird hand-less ends that open up. [[http://images2.wikia.nocookie.net/__cb20090328052919/half-life/en/images/thumb/6/6b/Gargantua.jpg/250px-Gargantua.jpg See]] [[http://images.wikia.com/half-life/en/images/7/75/Garg_hand_detail.jpg for]] [[http://images.wikia.com/half-life/en/images/2/23/Alien_Grunt_hd_nohh.jpg yourself.]] This the only real hint we get it in-game that they're part of the Xenian military rather than just wild animals... well, that and the fact that they don't attack sentient Xenians the few times its possible to get Gargs and Vortigaunts in the same room. The same doesn't apply for Xenian wildlife.

!!'''Alien Controller'''


* AirborneMook
* {{Cyborg}}: Not inherently obvious on the in-game model, but early model renders show them to be immensely mechanical.
* DyingRace: According to Marc Laidlaw, they became either this or just outright extinct after the death of the Nihilanth.
* EnergyBall: Their main method of attack.
* LevitatingLotusPosition: They strike this pose of the "hands closed together" variety whenever they launch their energy bolts at you.
* MadeOfIron: Despite being [[SquishyWizard squishy looking]], Controllers can take more damage than even the fully armored HECU soldiers, and much more than the Vortigaunts. This is likely because they have a weaker, invisible version of the Nihilanth's psychic shield, as they share many other abilities with him and do not visually wear any armor.
* MiniMook: They resemble the Nihilanth in many ways, but according to the Nihilanth himself, they're not of the same species. They look like hybrids of Nihilanth and vortigaunt, so maybe they're an artificial crossbreed species.
* MookLieutenant: According to Laidlaw, the Controllers are basically conduits for the Nihilanth's psychic control of the Vortigaunts, and as a result are the highest ranked "generic" aliens on Xen.
* MultiArmedAndDangerous: Just like the Nihilanth, Vortigaunts, and Alien Grunts.
* MyBrainIsBig: Their Head:Body ratio is even higher than the Nihilanth's
* PowerFloats: They float around rather quickly, making them hard to hit with several weapons.
* PsychicPowers: Similar to the Nihilanth, though much less powerful.
* ShockAndAwe: Via ball lightning, unlike the Vortigaunts' charged beam.

!!'''Alien Aircraft'''


* AmbiguousRobots: Similar to the Gargantua
* AirborneMook
* {{BFG}}: The powerful energy weapon they have built into their bellies, which in various scripted sequences is seen doing stuff like disintegrating rather thick rock formations and reducing an Osprey to scrap in less than a second of sustained fire.
* DeathFromAbove: Averted; they'll never attack targets on the ground.
* FinalBoss: One is the final boss of ''Decay''.
* FlyingSeafoodSpecial: Hence why they're commonly called "Manta Rays" by fans.
* GentleGiant: When encountered on Xen, they're completely harmless, and are pretty much the only moving thing that WON'T attack you. On Earth, however, they act as a dropship for the Xenian forces and attack HECU aircraft.
* LightningBruiser: Can take as much damage as a tank and fly at speeds that at least exceed Mach 1, evidenced by the shock waves they create.
* MadeOfIron: You only actually fight one once, at the end of ''Decay''. It takes as much damage as a tank to put down, though that may just be its FinalBoss-ness in action.
* NaturalWeapon: A laser-like weapon built into their belly that they can fire downward. It bears some resemblance to the weapon used by Combine Gunships when spawned by the console.
* TeleportersAndTransporters: They appear to have a teleporter built into their bellies, allowing them to drop alien soldiers from Xen.