Trigens are primates and/or humans that have been genetically altered by Dr. Krieger and his scientists in the testing of a mutagen. It was designed to enhance the strength, speed, and endurance of humans. The experiments yielded good results in terms of strength and speed enhancement, but the mutation had a horrific side effect; all Trigens become horribly deformed beasts, and their minds are torn apart by an overwhelming primal urge to kill and feed.

They were at first kept in containment areas and cages in various installations throughout the islands, but were able to escape (and, in some cases, were intentionally turned loose by other Trigens). There are five types of Trigens, of which two are chimpanzees and gorillas, and three are derived from humans. There is also one "failed" variant of Trigen which is seen twice but never encountered in-game. It can be found in the Bunker as a dead specimen and in a cutscene in which Jack and Val are confronted by Krieger in a helicopter.

The scientists wanted the specimens to be kept alive, even if they were loose and killing personnel, much to the horror of the mercenary force. Eventually, the mercs began to kill Trigens to stay alive and defend themselves but their efforts were in vain as the mutants soon overwhelmed the islands and celebrated in victory.

Trigens have a simple hierarchy based on size. Bigger Trigens will give orders to smaller Trigens when searching for Jack.

Non-Human Trigens Edit

These Trigens, dubbed 'monkeys' by Jack, come in two variants; One is a chimpanzee mutant, and one a gorilla mutant.

Monkeys Edit

Chimps are small but can shred through even a fully healed and armored Jack with just a few slashes, and are incredibly fast. They can leap upon a foe from meters away. The eyes of chimps cannot be seen, as they are covered in a layer of skin, have huge maws, and hairy backs.

Gorillas are slower and cannot jump as chimps can, but are slightly more tough and deal a bit more damage per swipe. They are able to pounce upon foes once they get close enough. Gorillas are totally hairless, their jaws are fused with their chests, and their deformed faces have bulging bloodshot eyes. The gorillas is also called Aberrations.

This Trigen variant is also the first mutant seen in which it attacks and kills a lone mercenary who was running for his life.


Mutant Screwed is only seen in Bunker on a table and it is the biggest mutant, with a big kind of knife on the right arm and a hand on the left one. It also has a big mouth (perhaps, two mouths) on its face. It is a Monkey, Big, and a human in one. The Mutant Screwed is in the game, but was never used, although you can see it in a cutscene when Kriger kicks Jack out of the helicopter. You can place a Mutant Screwed in the sandbox editor but it has no animations as it was most likely cut from development.

In Bunker, a Lab Worker was performing surgery on a Mutant Screwed but the operation was halted by Jack Carver.

Human Trigens Edit

Locusts/Fast Edit

Locusts are tall Trigens with abnormally large and muscular legs. They normally carry fully automatic AG36 rifles, and have the ability to leap incredible distances. They move quite fast, and will swipe/kick at enemies that get too close, though this type of mutant as the weakest melee damage. If a player happens to shoot a Locust when it is about to leap to another location, the Locust will struggle to jump, this is an incredible weakness of the Locusts and gives the player a higher chance of killing one. This trigen is also called Fast.

These Trigens can speak such as "Do you hear something" in a mutant sound. The voice is the same as the merc but in a kind of mutant voice.

Spectres/Morph/Stealth Edit

These rarely encountered Trigens are fitted with experimental cloaking devices that allow them to become completely invisible, and they put this to good use. They will often remain cloaked until they are killed, but using the biothermal CryVision goggles makes them light right up. They are armed with silenced MP5s, and will claw enemies that get close. This trigen is also called Morph or Stealth.

Fat Boys/Big Edit

These big, hugely muscular Trigens, called Fat Boys by some of the mercs, are extremely tough. Most times when they are encountered their right arms are mounted with missile launchers, but rarely, they are encountered with just their bare hands to fight with. When Jack gets too close, they will strike him with their claws, taking a severe amount of health away from the player.

Fat Boys have a glowing implant in their chests that devastates them when it is shot. These are not the only Trigens that ever speak, and they will growl things such as "You're goin' down!" and "Die!" when in combat.

They are the stupidest of all the Trigens, as best seen in the occasional instances where they may get stuck in a doorway and instead of taking another way around, will attempt to get free and kill Jack by repeatedly firing their launcher, killing themselves with a blast to the face from their own missiles in the process, since their shoulders are too wide to allow their arms (and thus the launcher) to fit through a doorway. If presented with a situation in which they cannot reach Jack, they will simply shoot in his general direction until something happens. They never flank enemies and always go for them head on. However, despite their shortcomings in common sense, they do tend to patrol, inspect areas that have unusual sounds, and will alert the other Trigens. Fat boys are also very deadly in confined areas, especially if Jack encounters a group of them.

They are characterized by their loud, lumbering footsteps. This Trigen is also called Big.

Mutant KriegerEdit

Mutant Krieger is just Dr. Krieger when he is a mutant in Volcano. He can make high and long jumps like Locusts/Fast and he can be invisible like Spectres/Morph/Stealth and he swipes if you are too close to him. Like Fat Boys/Big Trigens he has a very high amount of health and can withstand several dozen bullets before falling.

Trivia Edit

The Trigens bear some reseamblance to several enemies from other popular videogames of that time.

  • The simian-type Trigens resemble the demons from Doom 3.
  • The chimpanzee Trigens resemble the Fiends from the original Quake.
  • The human-type Trigens resemble the Strogg race from the Quake series.
  • The Fat Boys resemble a cross between the Cyberdemon from the original Doom games and the Tank from Quake 2.

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