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Space Pirates aren't the only threat amongst the stars.
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The X

    In General 
Debut: Metroid Fusion
"The creature took on the host's memories, appearance, abilities, everything. It sucks everything dry. Utterly terrifying. Can you not see that if a mimic such as this were to infiltrate a population, it could replicate almost indefinitely! With evil taking the form of an ally, the galaxy could be overthrown. It is truly the worst kind of evil... it has no name, but... we call it X."
Old Bird
Parasites that evolved on SR388, where they began to greatly endanger the planet's ecosystem by throwing it out of balance. These creatures were such a massive threat, the Chozo intervened by giving them a predator: The Metroid. Metroids were their main predator, until all of the Metroids were wiped out on SR388, allowing the X to make a recovery in their population and return in Metroid Fusion.
  • Aquatic Mook: They are more than up to the task of mimicking aquatic creatures to fight you when you're in the underwater sections of B.S.L. They will also combine Space Pirate DNA with said aquatic mook DNA to make mer-pirates that have no trouble swimming right up to you and taking chunks out of your health.
  • Artificial Brilliance: Mid-way through the game you'll encounter some blue X that are very cold. This is at a point in the game where you are very vulnerable to cold and will have to avoid them like the literal plague they are in a nasty inversion of Power-Ups. Once you collect a power-up that allows to absorb them safely though, the blue X will flee on sight after seeing that their tactic no longer works. This is the first hint that the X may be more sentient than first thought.
  • Artificial Stupidity: Despite the fact that the SA-X is the most powerful enemy in all of Fusion, and despite the X's ability to copy any organic body part, it apparently lacks a brain.
  • The Assimilator: They infect creatures and consume them on a cellular level, absorbing their DNA and using it for their own ends. The retain their hosts' knowledge and abilities for their own use.
  • Back from the Dead: As Fusion takes place after Other M, the Space Pirates are all but wiped out, Ridley was killed off for real on Zebes, while his clone and Nightmare were taken down in Other M. The X infected the frozen samples and corpses sent to B.S.L. for study and began mimicking them, bringing them back for another go against Samus.
  • Better to Die than Be Killed: The X has a pretty high chance to run after the body it is using is destroyed, but they'll usually stay and try to fight Samus to death.
  • Big Bad: They are collectively the main antagonistic force of Metroid Fusion. The SA-X is the most recurrent and dangerous of their number and caused the explosion that released its brethren around the B.S.L. and causes most of the deliberate damage that Samus has to circumvent.
  • Body Horror: Through the process of infecting hosts, the X either take over the body or replicate it after consuming it, typically while mutating the original form into something much worse. Samus doesn't even have to be fully infected for this trope to come into play for her.
  • Clipped-Wing Angel: Once the body they are using is destroyed they will revert to the basic X form, which Samus can literally eat on contact. When bosses take too much damage they revert to their Core-X form, losing the unique capabilities of their mimic body but gaining speed, flight, intangibility, and brief periods of invulnerability after each hit, but its clearly just one last desperate struggle with no attacks besides ramming Samus or shotting a simple projectile. That being said, the final core forms can be hairpulling especially after the hardest boss fights, such as Nightmare and the SA-X, as by that point it's very likely Samus is one step away from death.
  • The End of the World as We Know It: This is more or less what happened when the X made a comeback on SR-388. Without a predator to stop them, the X devoured all life on the planet. It's also what would have happened elsewhere had the Galactic Federation gone through with their plans to capture the SA-X.
  • Expy: Similar to how the Metroids are a Xenomorph Xerox, the X are an Expy of The Thing. Both infect hosts and assimilate them on a cellular level, and both imitate their previous victims for their own use.
  • Gameplay and Story Integration: Samus was injected with a serum the made her part Metroid. Metroids are able to devour X at the cellular level. The X you encounter in the game that are in their natural forms serve as your pickups and you are supposed to absorb larger Core-X to regain lost abilities.
  • Genetic Memory: They retain the intelligence and memories of what they infect and assimilate.
  • Geo Effects: They are smart enough to make use of them, particularly their use of cold areas to ward off Metroids.
  • Godzilla Threshold: The existence of the X (and the Federation's desire to study and use them) is one of the biggest thresholds in the entire series. As mentioned, they were the entire reason the Metroids, themselves a dangerous threat to the galaxy, were created by the Chozo. Samus considers detonating the BSL research station, even at the cost of her own life, to be worth it to destroy the X onboard. Adam's response is that this doesn't go far enough and that the station should be rammed into the planet below as it explodes in order to be well and truly rid of the X.
  • Greater-Scope Villain: For the entire series, especially Metroid II/Samus Returns, as the Metroids were created exactly to counter their infestation of SR388. And the X in general are much more dangerous to life due to their higher intelligence and being harder to fight off. Everything in the series can be traced back to the X in some form or fashion.
  • Humanoid Abomination: Aside from the SA-X, their efforts to mimic humans end up failing, as it results in them becoming gelatinous humanoid blobs wearing lab coats instead. They end up refining the process eventually, to the point where a Core-X perfectly mimics a scientist in order to set Sector 3 on the fritz.
  • Informed Attribute: While the manga did illustrate that the native life on SR388 fled from X on instinct and were still getting wiped out despite this adaption, it failed to demonstrate how they were "evil" or how anyone could conceivably use them as a tool for infiltrating the Federation (the game makes it clear their only drives are eat, reproduce and eliminate any perceived threats. It then stated anyone who thought they could be controlled was kidding themselves).
  • Intangible Man: Yes, they can go intangible and ignore most physical barriers. However, it is implied by the powerbomb that large enough explosions can still affect them, and it'd stated by Adam that big enough ones can kill them.
  • It Can Think: At first, they seem like a mindless species of parasites running purely on instinct. Over the course of the game, you begin to learn that they're ruthless, intelligent, and capable of acting against instinct for their own ends.
  • Kill and Replace: The X had already done this to the native fauna of SR388 prior to the events of Fusion, allowing them to infiltrate the orbiting research station by allowing the researchers to collect X mimicking biological samples from the planet's surface.
  • Last Ditch Move: Once the body they are using is destroyed they can still hang around. When this happens to bosses, the remaining X can form an armored core to make a Last Stand. They can't do much besides ramming Samus and a few can shoot very telegraphed proyectiles, but this last form can be challenging if the prior boss fight left Samus badly injured, which is particularly problematic in the second, harder half of the game.
  • LEGO Genetics: Not only can they mimic the DNA of their prey, but they can combine, mutate, and alter that DNA as they see fit to produce ever more dangerous forms.
  • Let X Be the Unknown: Real creative, Federation (Chozo in the manga)
  • Not Quite Dead: If the body they are mimicking is takes enough damage the X can still survive. If Samus doesn't absorb them quickly (she has some time to do so as the X is left stunned for a few seconds and doesn't move that fast) the X mass will run a bit away and reform a new mimic body or try to join another mimic to form a stronger one.
  • Power-Up: Interestingly, while they're the main threat of Fusion they're also your main source of energy.
  • Spikes of Villainy: They seem to add them to a lot of the things they mimic and the Core-Xs are loaded with them.
  • The Soulless: Samus muses that the X can mimic the knowledge, powers, memories, and abilities of their victims perfectly, but they cannot copy the soul. This is supported by the X driven by a mindless desire to consume everything despite being fully capable of planning and going against instinct to solve problems.
  • The Virus: Though not literally viruses, you do fight both infected victims and mimics made by the X using their hosts' DNA.

    SA-X (spoilers) 
Debut: Metroid Fusion
"The SA-X is mimicking you at full power. You can't face it. If you see the SA-X, just run."
Adam AI

An X mimicking Samus herself after forming from the surgically removed fragments of her armor.

  • Artificial Brilliance: During the final showdown with it, the SA-X will notice your fighting patterns and adapt to them. If you try to evade its attack often by jumping over it, it will soon answer with a Screw Attack right in that direction, hanging from ledges will lead to it shooting you down with missiles so that the tremor drop you down. If you keep evading the Ice Beam attacks with the Screw Attack invulneravility to projectiles, it will start to dive you with its own Screw Attacks, which deal high collision damage. Albeit, two colliding screw attacks will also deal damage to it and it reacts to being damaged the same way each time. Once one finds comfortable way of doing damage and avoiding the inevitable counter attack the SA-X will quickly crumble.
  • Artificial Stupidity: The SA-X also has absolutely horrid looping programming, to the point most can be exploited for humor. Power Bombs in particular seem to completely throw its programming into an infinite loop when Samus isn't in a room needing the Power Bomb to advance. This can be exploited in the boss fight with the SA-X. There is a ramp above the recharge station in the room where you must send the space station into SR388. Continuously charging and shooting SA-X will cause her AI to instinctively charge at you with a Screw Attack in an infinite loop as long as you know what to do.
  • Arm Cannon: As part of its body.
  • Big Bad: It was the one responsible for the disaster and for releasing all of the captured X into the station. It is also responsible for all of the tactical and deliberate damage done to the station that hindered Samus' progress and blocked off necessary areas, as well as being the more personal and dangerous opponent in the game.
  • Boring, but Practical: It only has 3 attacks, the Ice Beam, Screw Attack and a rare super missile. However, all of them hit like a truck, are very fast and the SA-X can deploy them in a plethora of adapting patterns, making it all the same an extremely challenging opponent, since your charged beam and screw attack are only effective ways of damaging it. Also true of its Armored Core form, which can only chase you and shoot at you with the Ice Beam. Doesn't do much else, but its hard to hit its vulnerable eye with a missile, and its weapon is still the Ice Beam. Like all core X the plasma beam will produce numerous x for which to regain health and ammo and as a hard core X it moves at a glacial pace, so if the player can survive for half a minute the challenge ammounts to successfully aiming and timing diffusion missiles.
  • Doppelgänger: Of Samus.
  • Clingy Costume: Its "armor" is part of its body.
  • Clipped-Wing Angel: When it takes too much damage it transforms into a gigantic hulking monster. It packs a serious punch but can be destroyed in only three charged shots and its laughably easy to evade its only attack, which is jumping around.
    • However, after this form goes down, it turns into the Beam Core-X, which can chase down Samus and use the ice beam to attack, as well as being immune to Samus's weapons unless she targets the eye while it prepares to attack. In this final desperate form, this trope is downplayed, as while it is definitely less difficult than the fight while the SA-X had its stable Power Suit form, the arena where the SA-X is fought makes the timing of hitting the eye when it opens difficultnote  not to mention it is still the fully powered ice beam, which instantly rips off 2 entire health tanks. After the brutal first part of the fight, the core portion can be especially stressful as Samus is likely low at health already and landing a hit on it demands her to expose herself to a direct ice beam.
  • Dragon-in-Chief: It doesn't seem to truly lead the X but it serves as the primary antagonist due to its intelligence and power.
  • Double Jump: It has the Space Jump just like Samus. Adding the Screw Attack which does a lot of damage, so trying to run away from it in the air is a pretty bad idea, especially since its faster than you too.
  • The Dreaded: Samus and the player spend most of Fusion hiding from it and the rest fleeing in terror. It's only in the final stretch of the game that Samus becomes strong enough to stand even a ghost of a chance against it and even then the Final Battle with it is widely regarded as one of the toughest fights in the entire series.
  • Final Boss: A 3 part showdown goes down with the SA-X at the climax of the game as Samus decides to perform a Final Solution on the X, with the SA-X showing up just as Samus is trying to go into the Operations Room to crash to Station into SR 388. An Omega Metroid shows up later, however, its just a Post-Final Boss as the fight is very easy, even with the time limit.
  • Glass Cannon: Compared to most other final bosses in the series such as Mother Brain, Metroid Prime, Dark Samus, The Metroid Queen, or Proteus Ridley, the SA-X isn't very durablenote , being comparable to the unifinished Ridley robot without the benefit of a guardable weak point. However, its nature as a Mirror Boss with a cheating screw attack gives it very high agility, making it harder to hit. It also packs an extremely painful punch, forcing the player to be careful. Its main projectile attack, the Ice Beam, is not easy to avoid without using Screw Attack (which stops you from starting a charge beam, and it can be broken by the SA-X screw attack at the cost of some of its health) and it instantly blows up 2 whole energy tanks. Contact damage with is also very high and it will constantly try to run you down with its own Screw Attack (especially after it notices your own attack patterns) which is as devastating as the Ice Beam. This is further pronounced in its last two desperate forms, neither of which last for long (its monster form goes down in 2 or 3 hits and its core in 6) but they blow up several energy tanks with any of their attacks. Just remember that you can't start a charge with a screw attack but can keept a charge with one and try to beat the glass cannon to the trigger.
  • Heartbeat Soundtrack: Heard when the SA-X is near, but when not in "Chasing you down and trying to kill you violently"-mode. This is basically its Leitmotif.
  • The Heavy: It initiates the plot of Fusion by escaping containment and is the game's most recurrent and deadly threat.
  • Implacable Man
    • It relentlessly pursues you once it spots you and nothing short of eluding it or concealing yourself will cause it to break off the pursuit. Even then, there are other encounters, and it is more then likely you will have no choice but to alert it to your presence. You can't harm it in any of these situations. All you can do at that point is run or hide.
    • Also in play during the final showdown with it, as the arena given to fight it is actually very, very large, but the SA-X will chase down Samus. Trying to run around is a pretty bad idea too, as the SA-X jumps faster than Samus and it will try to hit you with a Screw Attack at impossible for player angles if you are in the air for too long. Its best to keep fighting it in the flat portion of the area while maneuvering around its attacks as possible, albeit doing a loop around the platforms in the middle can give you one or two second of respite, which is useful if you've dropped low and are panicking.
  • Kill It with Ice: Its primary weapon and the reason why it's such a threat to Samus. Averted with itself, even if you can briefly freeze it with Ice Missiles it doesn't actually harm it and it thaws as quickly as a larval metroid.
  • Lightning Bruiser: It's just as maneuverable as Samus, moreso in the air, has all her weapons and has much tougher defenses.
  • Me's a Crowd: Late in the game, it creates several duplicates of itself.
  • Mirror Boss: More so than even Dark Samus, as while Dark Samus will use heavy modifications of Samus weapons, directly weaponize phazon and various things Samus simply can't obtain on the Prime series, the SA-X's arsenal is literally made up of Samus stolen weapons. The first portion of the final fight with it is this trope in full effect and is known to be one of the toughest fights in the franchise. Averted once its first form breaks, as it will pull into the classic X bag of tricks by turning into a hulking monster and then finally into its core form.
  • No Biological Sex: The SA-X isn't female in any capacity even if its imitating Samus, who is. It is consistenly just called "it". Justified as it is just a parasite using a very powerful form, and the X are creatures that reproduce asexually.
  • No-Sell: It has Samus fully upgraded armor on top of adding its own X brand modifications, so nothing can even touch it until the final battle with it. Ice Missiles can stun it for a single second but they don't do any damage. Even during the final battle, you can only hurt it with a fully charged shot of the Wave Beam. You can't feed it missiles like most other bosses, so while if it doesn't need that many attacks to bring it down, charging and aiming all of them while it rains you down with the hardest hitting attacks in the game is very difficult.
  • Screw This, I'm Out of Here!: When Samus destroys its body and shatters its Core-X casing, it flees through the vents rather than be absorbed.
  • Secret A.I. Moves: Downplayed, but the SA-X can do a screw attack without actually having to jump, which is something Samus never could. Notably, it can do it on a straight line, which is deadly during the Final Battle.
  • Shapeshifter Swan Song: It loses its hold on its mimicry of Samus when it takes too much damage, regressing into a bestial abomination with traits taken from her armor and very likely the hornoad the original parasite was infesting before it ever encountered Samus and finally breaks down into its core form.
  • Super Toughness: Unlike Samus herself, the SA-X is completely invincible to beams, missiles, super missiles, and power bombs. Only the penetrating effect of the plasma beam can harm it, and even then only a fully charged shot has any effect. Ice missiles can freeze it solid, but since it can thaw out faster than any other foe in the franchise, it's not much help.

A polyp-like creature mimicked by the X in Fusion. Fought in Sector 2 of the Biologic Space Laboratories.
  • All There in the Manual: Neither Fusion nor any of its official English guides give this boss a unique name. Its name is instead derived from the Japanese soundtrack.
  • Go for the Eye: Its single eye is its weak point, but it can't be hit from the outside. Instead, Samus has to shoot through its mouth and guts to damage it.
  • Goomba Stomp: Its main form of attack.
  • In a Single Bound: It jumps fairly high for an alien plant-polyp thing. The fact that it holds the High Jump power-up might have something to do with it.
  • Lamprey Mouth: Located in its underside.
  • Man-Eating Plant: Despite being clearly based on a Cnidarian polyp, it's apparently a plant. And it tries to eat Samus.
  • Starfish Aliens: Real-life Cnidarians are already alien in general, and this thing is not any less weird.
  • Swallowed Hole: This is actually a dumber strategy than spitting Samus out in this case, as it's digestive damage is pretty low and it's insides are vulnerable to morph ball bombs. Still, not getting swallowed feeding it missiles is a better strategy for Samus.
  • Tactical Suicide Boss: It would be impossible to defeat Zazabi if it didn't try to fall on Samus mouth open.

Debut: Metroid Fusion
"This sector is home to a very large creature the researchers call Serris. It is capable of moving and attacking at ultra-high speed. The more senseless and widespread destruction here may be attributable to Serris. No doubt the SA-X released it, but I can't be sure why yet. Serris has returned often to the breeding tank here. Its natural behavior must be to go back to it periodically. It's a valuable specimen, but you have been authorized to terminate it. If you don't, it may invade other sectors."
Adam AI
A giant aquatic serpent. Another creature mimicked by the X. Fought in Sector 4 of the Biologic Space Laboratories.
  • Dead All Along: When Samus is dispatched to hunt it down, it's under the assumption that it had escaped and was rampaging through Sector 4. It's not until the last room before its boss fight that she comes across Serris's skeleton, final proof that the X had killed and replaced it.
  • More Teeth than the Osmond Family: Serris sports a shark-like set of them.
  • Sea Monster: As previously noted, giant aquatic serpent.
  • Super Speed: Serris becomes super fast when damaged. Incidentally, Samus obtains the Speed Booster after defeating it, which raises the question of whether it's capable of using the ability due to the X that infected Samus or if it's just naturally as fast as Adam implies.
  • Underwater Boss Battle: Of the Above Water kind. Actually going underwater is inadvisable.

    Barrier Core-X 

A gigantic Core-X that steals the Varia Suit data from the download station. It's fought in Sector 6.
  • All There in the Manual: Neither Fusion nor any of its official English guides give this specific Core-X a unique name. It is named in the Japanese soundtrack, which can be literally translated as "Barrier Core-X". Given that "varia" is a mistranslation of "barrier", it could be alternatively translated as "Varia Core-X", which is another common Fan Nickname.
  • Foreshadowing: It holds the same defensive suit upgrade as the SA-X and the best method for attacking it is the same, or will be once Samus has upgraded enough.
  • King Mook: It's a bigger, more powerful version of the Core-X the other bosses become as their One-Winged Angel.
  • No-Sell: It's immune to missiles.
  • Orbiting Particle Shield: One made of smaller Core-X.
  • Ramming Always Works: Its only attack, but given its size, capability to pass through walls, and the movement restricting water in the room, it's an effective one.

    The Scientist 

An X that took over a scientist, planning to kill Samus by detonating the BSL rather than confront her itself. Fought in the Main Boiler Control Room of Sector 3.
  • Bowdlerise: Some Dummied Out sprites show the scientist getting blown back with its clothes getting tattered due to Samus shooting it, but "killing" a seemingly regular human was probably considered too violent for a game where every other opponent is distinctly inhuman.
  • It Can Think: The most obvious example of the X, capable of using computers and manipulating the station's systems.
  • Faking the Dead: Due to its mimicry of the human scientist, though it's unlikely anyone was fooled.
  • The Needs of the Many: It judged the deaths of all the X on the BSL to be a worthwhile price to ensure the safety of the species as a whole.
  • No Name Given: Fusion does not name this character, and one of the official English guides merely refers to him as scientist.
  • One-Winged Angel: When Samus confronts it, it sheds its human guise to assume its Core-X form.
  • Taking You with Me: It planned to detonate the entire station in a gambit to kill Samus, an act that would have killed itself and all other X on the station.
  • Was Once a Man: It was once a human before the X infected him.
  • Zero-Effort Boss: The scientist form anyway. You only need to shoot it once as it stays there typing on the boiler control computer, then it turns into a Core-X. It can actually be completely literal, as it will transform into its Core-X form after a few seconds regardless if it's shot or not.

A giant spider-like creature mimicked by the X. Fought in the Reactor Silo of the Biologic Space Laboratories.
  • All There in the Manual: Fusion does not name Yakuza in-game. Its name is instead derived from one of the official English guides.
  • Attack Its Weak Point: Yakuza can only be damaged by shooting its mouth when it opens to attack.
  • Breath Weapon: It can breathe fire, because being a giant spider thing wasn't already terrifying enough. In its second phase, it starts spitting an unindentified purple projectile (possibly poison).
  • Didn't Need Those Anyway!: Losing its legs in the first phase doesn't hinder it much, as it can Space Jump around without them, somehow.
  • Double Jump: It's capable of using Space Jump after losing its legs. Like Zazabi and Serris, it's unknown if this is a natural ability or if it is somehow using the actual power-up due to the X.
  • Four-Legged Insect: Spiders have four pair of legs, while the Yakuza has three like your typical insect, yet it's still referred as "Spider Boss" in the Prima guide. Justified in that the Yakuza is an alien creature.
  • Giant Spider: It's a giant arachnid/insectoid creature.
  • Gratuitous Japanese: Named after the term that describes public Japanese crime syndicate members.
  • Rugged Scar: On its left eye. It has many eyes, so it's not a big loss for it but it's still lazy of the X not to fix it.
  • Spiders Are Scary: With Fusion essentially being a horror game, the intent of the Yakuza being creepy is there.
  • Tactical Suicide Boss: Just like Zazabi, if Yakuza literally kept its mouth shut, it would be impossible to beat.


A strange biomass that is connected to the plantlife of the Biologic Space Laboratories. Mimicked by the X as well. Fought in Sector 2.
  • Alien Kudzu: Plants start infesting Sector 2 and spread to the reactor silo, cutting off all of the space station's power because of it.
  • All There in the Manual: Fusion does not name Nettori in-game. Its name is instead derived from one of the official English guides.
  • Cores-and-Turrets Boss: Nettori is the core, with pollen-spraying plants being its turrets.
  • Green Thumb: It was capable of making the plantlife aboard the research station grow out of control.
  • Living Statue: It resembles a Chozo Statue for some reason, although some official material refers to it as a "root", suggesting it is some equivalent of a mandrake
  • Man-Eating Plant: Its "turretts" also function as pitcher plants that slowly digest Samus if she falls in. Not being an insect or tree rodent of any, simply holding down the jump butten solves the problem for her.
  • One-Winged Angel: It becomes a Beam Core-X, allowing it to use its plasma beam to attack in addition to ramming while rendering its outer carapace immune to Samus's weapons.
  • Plant Aliens: If the whole thing about it being a root is true.
  • Plasma Cannon: It starts attacking with the Plasma Beam in its second phase. The same weapon is the reward for beating it.
  • Suspiciously Similar Substitute: To Mother Brain. Both enemies are Stationary Bosses whose rooms contain dangerous pools between safe platforms and projectile-firing objects on the ceiling, and defeating both destroys something Samus needed destroyed to complete her mission (the Space Pirate base in Mother Brain's case, the obstructive vines in Nettori's case).

A hideous amalgamation of flesh and machinery capable of manipulating gravity. Its tropes can be found here.

    Security Robot B.O.X. 
A security robot on the B.S.L. with an organic processing core. Its tropes can be found here.

An X duplicate formed from the cryogenically preserved corpse of Ridley. For the original's tropes, see here.


    In General 
Debut: Metroid Prime
"Darkness... coming..."
Aurora Unit 313
The Great Poison
Initially thought to be an strange yet exploitable energy source, Phazon is really a lifeform in itself. It spawns as living meteors known as Leviathans from its parent planet, called Phaaze, slowly swallowing all life and corrupting the planet so the cycle can repeat. It is the secret antagonistic force driving the plot of the Prime trilogy.
  • Always Someone Better: While phazon is powerful and sentient, Dark Samus proves to be more dangerous. When she comes to visit Phaaze, she manages to hijack the collective consciousness of phazon and bend it to her will.
  • Applied Phlebotinum: It's a mutagenic substance that the Space Pirates exploit for a power-up. Samus herself gets to experience its potential during the final battle against Metroid Prime in the eponymous game then goes whole-hog and uses it for her own power source by 3 (not by choice but it has its upsides).
  • Artistic License – Nuclear Physics: Phazon, a highly radioactive, nearly uncontrollable substance that may possibly be alive, originating from a supposedly sentient planet, is attempting to spread everywhere and it's supposedly stable.
  • Big Eater: It usually kills most organisms then absorbs the body, turning the corpse into Phazon. Fitting, considering its status as The Corruption.
    Cradle: "It eats relentlessly, worming out life wherever it blooms and corrupting what it cannot kill."
  • Boring, but Practical: Firing off a few leviathans every century at whatever planet seems the best fit at the moment? Not flashy and not the fastest way to spread, but it works. When Dark Samus takes over and starts using a more Awesome, but Impractical plan involving using leviathans as weapons to target her enemies, it ends up drawing attention Phaaze had avoided until then and causes its destruction.
  • The Corruption: Phazon usually prefers to kill and absorb weaker beings, but if the victim is strong enough, it is instead mutated and becomes an agent of Phazon.
  • Eldritch Abomination: Revealed in Prime 3 to be basically a huge transdimensional being with a heart the size of a planet. The Chozo's whole ascending to a "higher" dimension thing? That actually reduced their ability to fight it.
  • Fungus Humongous: There are some giant mushrooms that seem very heavily saturated with Phazon.
  • Genius Loci: Its core is Phaaze, a huge sentient planet.
  • Greater-Scope Villain: In the Prime trilogy. It is the source of all the conflict, but other beings — Metroid Prime and Ridley in the first game, Emperor Ing in the second game, Dark Samus in the third — serve as individual Big Bads in their own games.
  • Green Rocks: Phazon has quite a diverse range of uses: mutating plants and wildlife, being weaponized, driving creatures and several major characters insane, etc.
  • Hostile Terraforming: How Phaaze reproduces. Tallon IV, Dark Aether, Bryyo, Elysia and the Pirate Homeworld are all in early stages of the process when Samus arrives. It's unknown if Phaaze itself is the original source of Phazon or if it was terraformed by a Leviathan launched from somewhere else in the universe.
  • Law of Chromatic Superiority: Though most Phazon encountered in the game is blue, there are strains of "Red Phazon" found occasionally, stated to be far more potent and dangerous than the blue stuff. A batch with an orange tint serves as a hazard in the Impact Crater in the first game, and in the third game the Pirate Commander is outfitted in Red Phazite armor, which proves much more durable than the standard blue Phazite.
  • Nonstandard Game Over: When Samus spends too much time in Hypermode, the Phazon will corrupt her and turn her into a replica of Dark Samus. On Phaaze, you're stuck in Hypermode and this will slowly kill you.
  • Psycho Serum: Phazon tends to drive its infectees insane if it does not kill them.
  • Scenery Gorn/Scenery Porn: In the midst of Phazon twisting environments into strange forms, it does make things very pleasant to look at.
  • Sentient Phlebotinum: It seems to be more self aware than grass, but does not seem to be particularly intelligent.
  • Takes One to Kill One: Even the toughest of phazon structures and mutations can still be hurt by phazon-based weapons.
  • Toxic Phlebotinum:
    • Everything it doesn't kill, it turns into a violent killing machine, usually with a shortened lifespan. The space pirates discovered a strain that could be integrated into an organism's DNA via retrovirus, to give it a higher tolerance to the substance, but it still only worked in one case. Three if you count Samus and Metroid Prime.
    • If you break canisters of Phazon around Ing, they die. The Ing and the toxic alternate dimension they live in are a byproduct of Phazon hitting the original planet, and they still can't take it! The only being on all of Aether that does survive it is the Emperor Ing, who proceeds to hoard it, but still ends up losing its mind. It's possible this is why the Ing are so violent.
  • Uniqueness Decay: Phazon is a new substance in the first two games, with the Space Pirates going to great lengths to secure sources; in the third game, you can't walk two feet without bumping into phazon or something that runs on phazon (and that's not even counting yourself), Justified in that the stuff is actively trying to spread itself.
  • The Virus: Long term exposure that does not result in death changes organisms for the worst, driving them completely insane. It becomes even more so when the Space Pirates start using an actual virus to infuse a strand of it into a creature's DNA. Ironically, the literal viral Phazon has a much lower fatality rate. Once Phaaze produces a mature Leviathan, it travels to a suitable planet to infect, then it starts to spread Phazon until the planet itself becomes another Phaaze.

    Metroid Prime/Dark Samus 

Metroid Prime

See Metroid - Metroid Prime/Dark Samus for both Prime and Dark Samus.

Debut: Metroid Prime
"Flaahgra's growth cycle has been radically accelerated. As a result, it requires near-constant exposure to solar energy to remain active. This exposure has made Flaahgra's outer shell thick and durable. Concentrated weapon fire can daze it for short periods, but its lower root system is unprotected and vulnerable, however. Exploit this flaw when possible."
Scan Data
That which fouls the waters seeks the sun.
A massive mutated plant that poisoned the waters of Tallon IV.

  • Attack of the 50-Foot Whatever: It is huge, though fire makes it shrivel and shrink.
  • Breath Weapon: Can shoot energy balls from its mouth.
  • Combat Tentacles: It has turned the plant's roots and tendrils into tentacles.
  • Green Thumb: It can spawn thorny growths in attempts to impede Samus's movements and create tiny short lived plants.
  • Mix-and-Match Critters: It has traits from insects, plants, and whatever its face is.
  • Nightmare Face: Its floral features have been twisted to resemble a drooling arthropod like face.
  • Plant Aliens: It was a more like a minimally-moving, not-savagely-slice-you-apart-while-killing-the-local-ecosystem plant turned into what we see by phazon. Flaahgra is really just a hostile cancerous outgrowth though, once it is burned away the flower it sprouted from will remain alive and harmless.
  • Planimal: It has a central nervous system until you burn it out
  • Poisonous Person: In addition to utilizing its own toxins in battle against Samus, it passively leaks out poison into the Chozo Temple's water system, contaminating the whole temple.
  • Power of the Sun: Needs constant sunlight or it will quickly weaken.
  • Puzzle Boss: You have to make it retract its roots to damage its sensitive areas at its base, attacks to its body are almost pointless so long as it is bathed in sunlight.
  • Red Herring: You'll have the chance to read scans about a great poison before encountering it. While Flaahgra is the source of the poisonous water in the Chozo Temple (which disappears once it's defeated), it is not the great poison referenced in these scans; Phazon is.
  • Super Spit: Spews poisonous fluid that spawn acidic plants.
  • Sinister Scythe: It has these as hands.
  • Wake-Up Call Boss: For anyone who neglected to find the charge beam before approaching it or does not think to use it.
  • You Will Not Evade Me: The first thing it does is seal off the exit with vines.

    Queen Parasite 
A massive insectoid creature mutated from the common parasite. Its tropes can be found here.

A collection of Phazon-infused boulders that formed a rough consciousness, grouping together into a crude body. Its tropes can be found here.

    Metroid Hatchers 
Advanced Metroid mutations with durable phazite armor and the ability to spawn new metroids. For their tropes, see here.


The larva of Phaaze, living ships that crash into other worlds to implant them with a Phazon seed.
  • Colony Drop: To a degree normally, where they target planets but otherwise don't much care where they land. Played straight when Dark Samus takes control of Phaaze and begins aiming them at specific targets.
  • Kill It Through Its Stomach: After landing on a world, killing one requires entering it and destroying its core.
  • Kraken and Leviathan: They have the name of one and a tentacle form for the other, but otherwise aren't much like a karacken and even less like a leviathan unless you're fond of the Space Is an Ocean trope.
  • Living Ship: Usually they're just giant spaceborne organisms, but Dark Samus has one converted into a personal flagship.
  • Nigh Invulnerable: Reentry and planetary impact doesn't even scratch them, and their carapace is nearly invulnerable. It took a massive planetary defense laser to kill one and a dimension-shattering reaction to kill another.
  • Thinking Up Portals: They can create portals to travel through, as well as keep them open to allow other ships through.
  • Villain Teleportation: They can open wormholes to travel massive distances in seconds. This proves to be a plot point, as traditional methods of spaceship travel can't get to Phaaze in a reasonable amount of time, forcing the Federation to seize Dark Samus's leviathan flagship.
  • Uncertain Doom: The Tallon IV and Aether leviathans seem to have died between their landing and the events of their respective games. While the Aether leviathan could be resumed to have died in the cataclysm that split Dark and light Aether, there's no apparent explanation for why the Tallon IV leviathan doesn't appear in the impact crater (unless it became all Phazon on the planet as a part of its natural life cycle, or the Metroid Prime ate it. The Womb Level nature of the impact crater suggests that it is slowly dying but Metroid Prime does have a voracious appetite...).

A blue phaazoid

Floating beings of pure Phazon energy.


    In General 
Debut: Metroid Prime 2: Echoes
"It was the end of peace on Aether, for a new race was born that day on the dark world... one filled with hate and terrible power. They are the Ing."
'Ing' means terror
Creatures of darkness created when a Phazon meteor interacted with the Luminoth's planetary energy system. They seek to escape their pocket dimension and spread throughout the galaxy in a campaign of extermination.
  • Always Chaotic Evil: Their society promotes the hunting, killing and enslaving of everything that is not an Ing.
  • Artificial Brilliance: The Ing have no problem with bumrushing you out of a safe zone if they have lots of health left, and the ones that don't will snipe you with energy beams. Also, if you kill enough Ing with a supercharged safe zone (by using the Light Beam on it), they'll just stop approaching them entirely and always fire the beams.
  • Authority Equals Asskicking: The Emperor Ing is described as the most powerful of them by U-Mos. It is also the only Ing who can survive exposure to Phazon without using a Metroid host.
  • Back from the Brink: All that time between Samus making planetfall and getting the Energy Transfer Module? She could very well have gotten possessed by an Ing had she not been extremely lucky. And they would've succeeded in killing the few remaining Luminoth and stealing the last of the Light of Aether had Samus arrived at the Great Temple any later than when she did. The light world would've been destroyed as theirs became the default one, and they would've likely expanded beyond Aether, as warned by U-Mos. The only two known species that they probably wouldn't completely screw over are the Phazon beings, which they descend from, and the X, both of which possess similar qualities to the Ing.
  • Barrier Change Boss: The Emperor Ing after metamorphosis, which requires changing weapons to suit his weakness.
  • Beam Spam: Warrior Ing can channel energy from other dimensions through small portals, which functions basically the same as a laser beam. They primarily use this tactic to push targets out of safe zones.
  • Bee People: They behave like them. Fortunately only one of them has managed to survive their "royal jelly" but phazon-induced madness on the part of their emperor might just be the cause of their xenophobic society.
  • Casting a Shadow: The species as a whole can do this, to an extent, being amorphous blobs of what is essentially darkness.
  • Dark Is Evil: Not every species on Dark Aether is necessarily evil but these guys are by far the dominant force on the planet and are very evil.
  • Demonic Possession: What they're good at.
  • Demonic Invaders: They are aliens, but read the lore that describes how they were discovered; it reeks of the trope. They emerge from a less pleasant mirror of a world already altered for the worse if you're a pacifistic creature thanks to a meteor impact. They are made of a previously undiscovered form of matter, run on previously undiscovered sources of energy, emerge in a less than solid state, possess and turn the populace against each other, usually making the turned more powerful as a result but they are repelled by a "sacred" light.
  • Elite Mooks: Hunter Ing, capable of flight and intangibility, and are allowed to possess strong creatures like Pirate Commandoes.
  • Endangered Species: The only Ing still alive are the ones who managed to possess another creature, as they can't live on Aether by themselves. The space pirates have a darkling Metroid on display at one of their bases, as revealed in a Prime 3 scan.
  • Eviler Than Thou: The Pirates seek domination over the other races of the galaxy. The Ing want to be the only race in the galaxy.
  • Evil Minions: They breed worms to guard areas they can't be bothered to stay in. These are the only creatures Ing don't use as hosts or food sources and most of them don't even fight, just block the way.
  • The Goomba: Inglets, the most numerous and expendable combat-capable Ing. Many boss battles throw them at you simply so they can provide health and ammo refreshments.
  • The Heartless: "The Ing are creatures of shadow and darkness, knowing nothing of peace or mercy."
  • Humanoid Abomination: They possess the deceased Galactic Federation troopers on Aether to use against Samus, but have trouble achieving full parasitic fusion with dead bodies; the furthest they ever got was increased stamina with the Missile Trooper, though all have very low agility and response time.
  • Intangible Man: Hunter Ing; they still can't handle the light of Aether, but Samus's light beam is trivial to them.
  • Invisibility: Some Ing have methods of this, to the point they can hide from echolocation and sonar. Most notoriously their flying caches.
  • King Mook: The Ing seem to have a fondness for giant versions of normal enemies as bosses:
    • Dark Alpha Splinter (Alpha Splinter)
    • Sub-Guardians: Bomb Guardian (Alpha Sanddigger), Jump and Boost Guardians (Warrior Ing), Grapple Guardian (Grenchler), Spider Guardian (Pillbug), and Power Bomb Guardian (Sporb)
    • Guardians: Amorbis (Sanddigger), Chykka (War Wasp), and Quadraxis (Quad)
    • Emperor Ing (recognizable as a Warrior Ing in his third form; possibly an Inglet in his first).
  • Knight of Cerebus: The Ing are much more serious and extensive in their damage and competence than the Space Pirates could ever hope for. Things go downhill quick once they show up, both in-game and in the lore.
  • Light 'em Up: They are extremely vulnerable to this. At least if it's light made from Aether's planetary energy.
  • Made of Evil: Unlike almost every other creature in the Metroid Prime Trilogy that is a preexisting animal mutated and driven mad by Phazon, the Ing are implied to have come into existence the moment impact split Aether in two. The presence in Metroid Prime 3: Corruption of the "Phaz-Ing," a creature resembling the Inglet made of blue liquid Phazon and seemingly native to Phaaze, leads some to suggest that Ing are in fact shadowy variant of phazon; that the Emperor Ing started off as a Phaz-Ing from Phaaze that got carried to Aether in a Leviathan and eventually grew into a giant monster on Dark Aether. The lack of tolerance for phazon among the other Ing put this into question, however.
  • Mecha-Mooks: They quickly learn how to possess machines created by the Luminoth, and promptly turn them against their creators.
  • Mighty Glacier: Ingsmashers, corrupted Mecha-Mooks, serve as the heavies of the Ing empire.
  • Mini Mook: Ing Larva and Ingstorms.
  • Mook Carryover: They make a point to possess Pirate Troopers, as they are already used to following orders.
  • Night of the Living Mooks: When they use the dead marines to attack Samus.
  • No Range Like Point-Blank Range: Hunter Ing's Intangible Man ability activates a fraction of a second after Samus fires, making them vulnerable at extremely close range. Combining that with a charged Light Beam makes them very easy to kill.
  • Omnicidal Maniac: Their goal is to collect all the planetary energy so Dark Aether can replace Light Aether in our world. Using it as a stepping stone, the would expand and exterminate all other life.
  • Our Demons Are Different: While clearly alien, they hit just about every demonic trait in the book.
  • Red and Black and Evil All Over: Ing color schemes tend to include lots of red and black.
  • Rite of Passage: Ing are forced to fend for themselves as larva, then fight dangerous opponents after maturing. The idea is to make the young ones rely on each other and hate all other lifeforms, and it seems to work.
  • Starfish Aliens: Unfriendly ones at that. The most promoted Ing type, the Warrior Ing, looks like an 8-foot tall spider with five legs, and other Ing types look even weirder.
  • Stealth Pun: In Echoes, the Sub-Guardians are Ing-possessed creatures with a "Boost Guardian, Grapple Guardian, etc" naming convention. Boost Ing, Grapple Ing...
  • The Swarm: Some areas in the Sky Temple Grounds and Ing Hive have clouds of tiny Ing called Ingstorms. Stepping into them without the Light Suit will kill you in mere seconds. Don't do it.
  • Taking You with Me: After their world begins to die, several Warrior Ing attempt to prevent Samus's escape from Dark Aether so she'll die with them, but she just jumps over them and continues going.
  • Wall Crawl: All of them that are mobile but don't fly can seemingly do this. Usually by flattening themselves into puddles
  • Wall Master: Darkling Tentacles. Presumably a warrior making a portal and a hunter sticking a limb through in a parody of "noodling" fishing strategy.
  • Weakened by the Light: Aether's atmosphere is just as dangerous to the Ing as Dark Aether is to Aether creatures, and light energy produced from it is brutally effective against them.
  • You Will Be Assimilated: They seem to take a page from the X Parasites, in that both mutate other creatures into new forms. The Ing possess live hosts, however; their attempts to bring back dead bodies were pretty pathetic (though freaky). All X need is DNA; they eat the prey first, then start making copies. Before you write the Ing off as less dangerous, know that they can possess Metroids, which X cannot work with at all. To make things even worse, they're also capable of possessing mechanical beings and artificial intelligence. As seen with the security robot B.O.X., X require organic components to work with. Not only that, the possessed troopers Samus fights early on indicate that even if the results are not ideal they're not above possessing corpses.

    The Emperor Ing 
Debut: Metroid Prime 2: Echoes
"Bioscans indicate that this is the eldest, strongest Ing in the Horde, the alpha and the omega. It has absorbed enormous amounts of Phazon energy into its body, mutating itself in the process. Apparently this power is not enough for the creature, as it is now siphoning energy from the final Energy Controller."
Scan Data
The Emperor after its final mutation
The supreme ruler of the Ing Horde, mutated into a massive beast through Phazon exposure.
  • Attack Its Weak Point: The tentacles followed by the eye in the first form, the tentacles in the gaps of its cocoon, and its mouth/eye in the final form.
  • Barrier Change Boss: In its final form it has two barrier types, one dark and one light, that must be struck with the opposite energy to damage it. It also has a third neutral type, during which it attacks cannot harm it but only force it to switch to one of its polarized barriers, particularly if you're quick with a super missile.
  • Beam Spam: It can pull the same beam trick lesser Ing can, but with greater speed and volume.
  • Big Bad: Of Echoes.
  • Born Winner: Like the Omega Pirate in the first Prime, the Emperor Ing has a super-high Phazon tolerance and thus gains a lot of power from it. And also like the Omega Pirate, this comes at a price: it loses its mind.
  • Boss Arena Idiocy: Inverted. The walls of its arena are covered in Phazon, which it's immune to but Samus isn't. One wrong step, one miscalculation about a jump, one knock-back attack, and suddenly you're pressed right against a wall of solid pain.
  • Boss Battle: Of the Dark Temple Grounds area and the Final Boss in general.
  • Casting a Shadow: As with lesser Ing, it can hurtle blasts of pure darkness. In its final form it can channel this into a beam that entraps targets in a cocoon of darkness, just like the Dark Beam's Entangler.
  • Combat Tentacles: In its initial form it has four at first, increasing the number as the fight goes on. Its chrysalis form also has several that will knock Samus off its shell and into the toxic fog.
  • Deadly Gas: It vents this to protect itself while it's in its cocoon.
  • Enemy Mine: In a humorous case, the biggest baddest beast of the Ing has nightbarbs, the natural prey of Ing, in its lair, and swarms of them will occasionally attack it while Samus fights it. They can't actually hurt the emperor however.
  • Everything's Better with Spinning: In its initial form one of its attacks is to spin in place, sticking its tentacles out to swipe Samus.
  • Eye Beams: Quite formidable, considering the size of its eye.
  • Final Boss: What it's set up to be, only for Dark Samus to swoop in as the Post-Final Boss.
  • Final Boss Preview: A minor example. A few rooms before you fight it you find the energy you're meant to be collecting, only for its tentacles to grab it and melt away.
  • Flunky Boss: Its cocoon form spawns Inglets while its mutated form attracts swarms of nightbarbs and some unidentified flying thing.
  • Horns of Villainy: Three large horns in its final form that resemble the front of a crown.
  • Interface Screw: Not to the degree of the Rezbits, but the beam it fires in its eye form cancels Samus's beam charge and prevents her from firing for a short time.
  • King Mook: Its final form resembles a giant warrior Ing, while its first is rather like a titanic Inglet.
  • Large and in Charge: It's only slightly smaller than Quadraxis.
  • Light 'em Up: The Emperor Ing is unusual for an Ing in that it is not particularly weak to the Light Beam (It's considered "neutral", like the Chykka's first form), and in fact is capable of using light-based attacks right alongside the standard Ing dark-based ones. This is probably because it has ingested the last portion of the Light of Aether. Given that that's usually the best way to kill an Ing but this one took it in without using the energy transfer module, it's a testament to the Emperor's toughness.
  • Lightning Bruiser: Deceptively fast and able to leap across the room in its final form.
  • Load-Bearing Boss: Not technically, but Samus absorbs the last of the planetary energy in the same cutscene where it dies, which puts all of Dark Aether on a countdown to destruction.
  • Orcus on His Throne: It's unclear if it's actually capable of leaving the sky Temple in its un-mutated form, and until Samus is at its doorstep it's not desperate enough to try merging with the final Energy Controller to attain its highly-mobile final form. Which is good, because if it tried to attack Samus before she got the Light Suit she likely wouldn't have been able to survive.
  • Omnicidal Maniac: As with all Ing. As the leader it may be the only true example, with the rest of the species following its lead.
  • Ramming Always Works: In its final form it can slide forward across the ground, using its bladed legs like skates.
  • Red Eyes, Take Warning: When its eye is red it is hard to hurt.
  • Shockwave Stomp: In the final form.
  • Spikes of Villainy: Its final form has spikes and barbs on it legs and body.
  • Stationary Boss: In its first form it just swivels to face you, while its chrysalis form has all the mobility of, well, a chrysalis. Averted with its final mutated form.
  • Thinking Up Portals: It its initial form it sill sometimes stick its tentacles through portals to attack Samus from all angles.

Debut: Metroid Prime 2: Echoes
"The enormous Amorbis can move through solid rock and earth with ease, and can sense the location of surface-level prey deep within the ground. They will attempt to ram any target they can find in their domain. They are vulnerable to all forms of weapons fire, but are incredibly strong and resistant to pain."
Scan Data
The three Amorbis worms in their dark form
A trio of gargantuan worm-like creatures kept as guards by the Ing in the Dark Agon Wastes temple.

  • Attack Animal: The Ing were said to breed and raise worms for various tasks; these were, if not their guard dogs, then at least something they left in the general area to ensure nobody got the dark suit or stolen planetary energy.
  • Boss Battle: For the Dark Agon Wastes area.
  • Casting a Shadow: Not on their own, but once attached to the dark sphere, they will be capable of flinging safe zone-neutralizing shots of darkness or channel thick purple energy beams. The dark attacks seem to take on a different characteristic around the dark sphere, which prevents you from clearing away beacons the way you normally do.
  • Feed It a Bomb: The only way to damage them is to let them inhale you and then lay a bomb in their mouths. Rather than really letting them inhale you, you're hitting them hard enough to make them fall over and gasp for air... at which point you give them a metal ball laying bombs. Damage to their hides will only slow them down till you directly hit the internal organs it seems.
  • Gate Guardian: For the Dark Agon Temple.
  • King Mook: They're giant Sandiggers.
  • Nice Job Fixing It, Villain!: If it hadn't shattered the area sphere in its thrashings, Samus would never have obtained the Dark Suit and would have almost certainly died in the safe-zone scare later areas before she got a chance to get the Light Suit.
  • Pivotal Boss: While using dark attacks.
  • Sand Worm: While not to Dune levels, they are close. Very large sand worms Amorbis are.
  • Screw This, I'm Outta Here!: Kill one and the others will flee, never bothering Samus again.
  • Third Eye: That makes nine between them.
  • Wave-Motion Gun: They can fire three huge, sweeping dark beams when attached to the dark sphere.
  • Wolf Pack Boss: What's that? You've beaten giant worms before, not too long ago in this very game you say? Fine, here's three of them bigger than any we threw at you before!
  • Wormsign: The sand above where they're about to emerge will begin to flow outward as if being pushed up from below. If the sand you're directly standing on is doing this, MOVE.

Debut: Metroid Prime 2: Echoes
"The Chykka has rapidly aged to its adult form. It will attack by firing high-powered bursts of dark water at rapid speed. If frustrated, it will attempt to dive and ram you."
Scan Data
Adult Chykka in its light form
At first a large cocoon obstructing passage into the Dark Torvus Bog temple, it hatches into a vicious aquatic larva before evolving into its adult form.
  • Barrier Change Boss: While any weapons will damage it, during the second phase it switches between being weak to light and dark.
  • Big Creepy-Crawlies: Chykka is a big dragonfly thing.
  • Boss Fight: For the Torvus Bog area.
  • Deader Than Dead: You can scan Chykka's corpse after the battle is over (nearly every other boss either fades away or explodes), which basically goes to assure you, in no uncertain terms, that the creature is finally dead:
    "Bioscan complete. Target Chykka has been terminated. Lifesigns are at flatline. No regenerative ability in effect. No evidence of symbiotic corpse possession. Resurrection does not appear likely."
  • Enemy Mine: The larva sometimes collides with dormant ing-possessed creatures. Rather than attack it for disturbing them they instead make a beeline for Samus.
  • Eyeless Face: The larva form.
  • Gate Guardian: It guards the Dark Torvus Temple.
  • Giant Flyer: Once an adult.
  • Grimy Water: Lives in and shoots it at you.
  • Hermaphrodite: Self-impregnating, no less.
  • King Mook: Its adult form is a super-sized War Wasp. In other ways, it has a strong resemblance to both Shredders and Shriekers—though both of those are plants, not insects.
  • Making a Splash: In all forms really but in the most literal way during the larva sequence. That's when you shoot it.
  • Marathon Boss: One of the longest boss battles in the series.
  • Rapid Aging: It started out as an egg. Within a few minutes, it's a fully mature adult.
  • Sequential Boss: The first phase is against its larval form, which for all intents and purposes behaves like a fish in the dark waters. After being defeated, it retreats and rapidly metamorphs into its adult stage, which is a massive wasp-like insect that alternates between light and dark forms.
  • Super Spit: Its larval form spits digestive juices on you.
  • Weaponized Offspring: As Dark Chykka, it often births swarms of Chykklings to harass you (and provide easy health/ammo refills).

A colossal Luminoth war machine stolen by the Ing to guard the Ing Hive temple. See Metroid - Others.

    The Sub-Guardians 

The Ing who stole and used Samus's upgrades.

In General

  • King Mook: All of them are for various other enemies. Given that most of the mooks they're the kings of are light creatures that the Ing tend to possess and transform into larger, more powerful versions of themselves, it's to be expected.
    • The Bomb Guardian is the exception, as the alpha sanddigger was already a king mook.
    • The Space and Boost Guardians are both warrior Ing.
    • The Grapple Guardian is a grenchler.
    • The Spider Guardian is a pillbug.
    • The Power Bomb Guardian is a sporb.
  • Mega Manning: They all use the abilities they stole from Samus to fight against her.
  • Mini-Boss: They're all minor bosses Samus beats to get upgrades so she can progress through other areas.

Bomb Guardian

An Ing infected Alpha Sanddigger that holds the morph ball bombs.
  • A Head at Each End: Averted. Unlike normal sanddiggers, and the alpha itself before infection, the bomb guardian only has one head.
  • Spikes of Villainy: Quite a few, cresting its head and lining its back.
  • Throw Down the Bomblet: It trails bombs almost constantly, will occasionally shake clusters of them around the arena and will sometimes just lob one at you

Jump Guardian

A powerful warrior Ing that stole and uses the space jump boots.

Boost Guardian

A warrior Ing that stole the boost ball.
  • Horns of Villainy: It has a large, blade-like horn over its eye.
  • Ramming Always Works: Its most common move is to use the boost ball to ricochet around the arena, slamming into Samus in the process.
  • Reused Character Design: It's identical to the Jump Guardian that you fight earlier in the game.
  • Voluntary Shapeshifting: It can transform into the morph ball to utilize the boost ball, despite not having the morph ball upgrade itself.

Grapple Guardian
The Ing that stole the grapple beam and subsequently possessed a grenchler.
  • Armless Biped: Due to its host creature.
  • Attack Its Weak Point: Its back, which requires stunning it to make it drop the shield covering it. Doing that requires shooting it in the eye, a secondary weak point that doesn't actually hurt it.
  • Body Horror: The presence of the grapple beam seems to have caused the grenchler to mutate more drastically than the dark grenchlers (which still mostly resembles the unpossessed specimens aside from pigmentation and some of its eyes being moved to the jaw joints). One of the more unusual mutations (and potentially endangering if not for the grapple beam) that the Grapple Guardian received after possession is a big hole in its lower jaw.
  • Deflector Shields: The grapple beam is modified to provide an energy shield for its weak point, requiring Samus to stun it so it drops the shield.
  • Evil Is Bigger: It's noticeably bigger than normal and dark grenchlers.
  • High-Voltage Death: In the first part of the fight it must be tricked into using the grapple beam on the electrified pillars in the room in order to stun and immobilize it.
  • Horns of Villainy: It has a rhino-like horn it uses to fire the grapple beam.
  • In the Back: Where its weak point is.
  • Turns Red: Partway through the fight it shorts out the pillars in the room and starts moving faster, making it harder to stun it.
  • You Will Not Evade Me: If it hits Samus with the grapple beam, it drags her into biting range.

Spider Guardian
An Ing possessed pillbug that holds the spider ball.
  • Collision Damage: It harms Samus this way even without its electrical field.
  • High-Voltage Death: Both ways, it's surrounded by an electrical field that harms Samus and is killed by tricking it into ramming electrical pylons.
  • Puzzle Boss: It doesn't attack Samus directly and none of her attacks can hurt it, forcing her to use a series of bomb slots and electrified pylons to kill it.
  • That One Boss: Acknowledged the point that the Wii versions chose to make it easier.

Power Bomb Guardian

An Ing possessed sporb that holds the power bomb.
  • Puzzle Boss: Samus's weapons can't penetrate its armor, so she spends the boss fight avoiding its attacks while she destabilizes the ceiling to fall and crush it.
  • Stationary Boss: That's what happens when you possess a plant.
  • Throw Down the Bomblet: It throws power bombs.

    Dark Alpha Splinter

The first boss of Echoes, an Ing-possessed alpha splinter.
  • Fangs Are Evil: In the game it has no mouth, but the manga gives it a mouth bristling with pointed teeth.
  • Four-Legged Insect: Thanks to its host body.
  • King Mook: It was a bigger, stronger splinter even before being possessed.
  • The Pawns Go First: A pack of dark splinters attack Samus before it shows up.
  • Ramming Always Works: More of a leap than most examples, but its main attack it to hurl itself at Samus.
  • Warm-Up Boss: It's the first boss of Echoes.
  • Super Spit: It spits globs of purple liquid at Samus from a distance.
  • Villain of Another Story: It was the Ing entrusted with siphoning the last of Aether's energy and sealing the Ing's victory. Given the Ing's war-based society, that's not the kind of honor one is randomly assigned.

    Dark Missile Trooper

The corpse of a Federation trooper possessed by an Ing.
  • Ambiguous Gender: The gender of the trooper is unknown, as the Federation employs both men and women as combat troops. Though at the point Samus fights them they're really just a convenient meat suit for an Ing, so their gender is rather irrelevant.
  • Ambiguous Situation: Was the trooper corpse carrying a missile weapon or is this the host of the Ing that stole Samus's missile launcher? Scans indicate the former, but the dangling plot thread of the missile launcher leaves it open to interpretation.
  • Boom, Headshot!: It's clear that the trooper was killed by a blow to the head. Not only is their helmet significantly more broken open than the other dark troopers, a fragment of something is still embedded in their exposed skull.
  • He Was Right There All Along: Justified example, their corpse was laying right on the ground in front of Samus when she arrived in the room the first time, before she encounterd the Ing. It's only when she returns later that the Ing possesses the corpse and attacks her.
  • King Mook: Little more than a particularly tough dark trooper with a better weapon.
  • Mini-Boss: It's a minor boss even by the standards of the other minibosses in Echoes.
  • Nightmare Face: Looking at its model reveals glowing red eyes set into withered, blackened flesh that peels back to reveal teeth and bone.
  • Our Zombies Are Different: Like the normal dark troopers, it's a corpse possessed by an Ing.
  • Skippable Boss: It's an out of the way fight that only grants a missile tank upon defeating it, so it's easy to miss.


    Zoomers and Geemers
Debut: Metroid 1

Spiky-backed insects that are common pests on multiple worlds.
  • The Goomba: The most basic and common Metroid enemy.
  • Inconsistent Dub: In Metroid and Zero Mission, they are called Zoomers. In Super Metroid and Other M, they are called Geemers. This is reconciled by Metroid Prime, which treats Zoomers and Geemers as separate species. For added inconsistency, the Zoomer artwork from Zero Mission is used for the Geemer spirit in Super Smash Bros. Ultimate.
  • Related in the Adaptation: Played with. In Japanese, Zoomers and Geemers are the same species (at least, in the 2D games). In the English translation, they are given different names due to an Inconsistent Dub, which would later be established as separate but related species in Metroid Prime.
  • Suspiciously Similar Substitute: There are other enemies such as the Moheeks and the Green Kralees that have the exact same behavior as the Zoomers.
  • Took a Level in Badass: A downplayed example, as they are still among the weakest enemies in the game. In the 2D and Prime games, Zoomers and Geemers ignore Samus and can only hurt her if she happens to make contact with them. In Other M, Geemers actively lunge at Samus.
  • Typhoid Mary: The logbook in Hunters reveals that Zoomers are carriers of flesh-eating bacteria, which has caused the extinction of many Zebesian species. Likewise, the Corruption logbook says that Geemers carry other diseases due to their diet of other species' waste.
  • Unique Enemy: In Super Metroid, there is a single Geemer that has a unique color scheme and will actively follow Samus's movements (whereas most Geemers completely ignore her). It can be found in Crateria near the Wrecked Ship.

Debut: Metroid II: Return of Samus
"A native life-form that swallowed the Spring Ball Item Sphere and inadvertently absorbed its power, Arachnus is an armadillo-like beast that spins and spits projectiles to attack its enemies. The Spring Ball gives it the ability to jump in the air while curled into its shell. Defeating it shakes the Item Sphere loose, giving you the opportunity to take it for yourself."
Metroid: Samus Returns Official Guide
An armadillo-like creature native to SR388. Its form was mimicked by an X-parasite aboard the BSL Station.
  • Adaptational Badass: In Return of Samus, Arachnus was originally an easy Puzzle Boss that could only curl into a ball and jump around or stand still and spit fireballs. In the Video Game Remake Samus Returns, Arachnus is bigger, much faster, and much more powerful and resilient, even retaining some abilities from the X-infected Arachnus in Metroid: Fusion.
  • Breath Weapon: Arachnus can spit fireballs.
  • Chest Monster: In Return of Samus and Samus Returns, Arachnus is found curled up in its shell, resting in the hands of a Chozo statue in such a way that mimics the appearance of an item sphere, only to spring up and attack when Samus tries to obtain the item. Additionally, the official guide to Samus Returns claims that Arachnus swallowed the Spring Ball, suggesting that Arachnus not only mimics a fake item sphere but actually replaced a real item sphere.
  • Depending on the Artist: The in-game Fusion sprite for Arachnus closely resembles the Return of Samus artwork for Arachnus, although its head and neck are colored purple instead of red. However, the Fusion boxart depicts Arachnus with dark red skin, along with bright green fur on its neck, shoulders, and hips; this is the only time Arachnus (natural or X parasite) is depicted with hair.
  • Glass Cannon: The X-infected Arachnus is this when compared to the natural Arachnus (as originally depicted in Return of Samus). On one hand, it is bigger, has sharper claws, and has more projectile attacks that are longer range and more damaging. On the other hand, it is vulnerable to all of Samus's weapons (while the natural Arachnus was originally only vulnerable to Morph Bombs) and can't jump.
  • Ground Pound: In Samus Returns, Arachnus has a new move that lets it spin in mid-air and slam into the ground in ball form.
  • He Was Right There All Along: In Return of Samus and Samus Returns, Arachnus is found in a room containing only a Chozo statue holding what appears to be an item sphere. Arachnus does not engage Samus until she tries to obtain the item, at which point it will reveal its true form.
  • Lamprey Mouth: Similar to the post-larval Metroid stages, Arachnus has a radial mouth with three prominent fangs.
  • Lone Wolf Boss: In Return of Samus, Arachnus is the only non-Metroid boss in the entire game.
  • Non-Indicative Name: Despite its name, Arachnus does not have any arachnid features, more closely resembling an armadillo than a spider.
  • Puzzle Boss: In Return of Samus. While it's a pushover of a fight, it's up to the player to figure out that you can only damage Arachnus with the Morph Ball Bombs. The game gives a vague clue to it due to the Arachnus curling up and bouncing around like a Morph Ball.
  • Rolling Attack: In Fusion, Arachnus can curl into a ball and then roll quickly to ram into a wall. This was also retconned into the normal Arachnus's moveset in Samus Returns.
  • Sword Beam: In Fusion, when Arachnus slashes with its claws, it generates an energy wave that greatly extends the melee attack's range. This was also retconned into the normal Arachnus's moveset in Samus Returns.

A large creature Samus fights in the depths of Norfair.
  • Advancing Boss of Doom: It slowly advances on Samus, driving her back into a spike-covered wall of it gets too far.
  • Barrier-Busting Blow: It smashes down the spiked wall in its final moments.
  • Berserk Button: Do not use a Power Bomb against it. Failing to heed this warning will cause it to charge forward much further than usual.
  • Breath Weapon: It fires projectiles from its mouth a multiple angles, which serve to stop Samus's own shots from hitting it in the face. If you can shoot more while jumping to its eye level enough it will be pushed back.
  • The Cameo: In Donkey Kong Country Returns, of all places, where its skull can be seen in the background of the Foggy Fumes level. Considering the game was developed by Retro Studios, the developers of the Prime games, it doubles as a Development Gag.
  • Cruel and Unusual Death: It falls into a pool of acid and the flesh melts off its bones. You get a graphic view of this process as it desperately tries to climb out before sinking out of view.
  • Dummied Out: It was almost in Zero Mission, but was cut, though it can still be found in the game files.
  • Extra Eyes: It has eight eyes.
  • Mini-Boss: Referred to as "the Mini-Boss of Norfair" in the manual, with Ridley being the main boss of the area.
  • Nigh-Invulnerability: None of Samus's attacks actually damage it, they just hurt it enough to make it retreat.
  • Nothing but Skulls: All of its bones but its skull vanish after it dies.
  • Not Quite Dead: After falling into the acid, it bursts through the wall for one last try at Samus. Given that the acid has already reduced it to a skeleton, it dies almost immediately after.
  • Ring-Out Boss: You have to knock it backwards onto a bridge too weak to support its weight to defeat it.


An eel-like creature encountered in Maridia.
  • Attack Its Weak Point: Its head is the only vulnerable part of its body.
  • Mini-Boss: Referred to as a mini-boss in the NTSC guidebook and in the Japanese soundtrack, with Draygon being the main boss of Maridia.
  • Segmented Serpent: Although it appears much more natural and smooth in artwork, the Botwoon's in-game sprite is comprised of many segments.
  • Super Spit: It spits green projectiles when it emerges from a hole in the wall.
  • Turns Red: As it takes more damage, the Botwoon becomes faster and faster. It also literally turns red when low on health.
  • Underwater Boss Battle: Botwoon is fought in the underwater section of Maridia, although the Gravity Suit should negate any effects of fighting underwater.
  • Whack-a-Monster: Botwoon pops up from holes in the wall. To damage it, Samus must shoot it in the head when it peeks out of one of the holes to spit projectiles.

    Namihe and Fune
Namihe (top) and Fune (bottom)

Two closely-related types of worm-like creatures that reside in Norfair. Specimens are also found on the BOTTLE SHIP and BSL Station, with the former featuring a Namihe and Fune together as a Dual Boss.
  • Dual Boss: In Other M, a Namihe and Fune appear together in a boss fight. They both attack Samus at once, and when she defeats one, the other becomes tougher to kill.
  • Eyeless Face: The Fune, which heightens its Xenomorph Xerox features.
  • Invincible Minor Minion: The Namihe in Super Metroid cannot be killed, although it can still be frozen by the Ice Beam.
  • Kill One, Others Get Stronger: During the Dual Boss fight in Other M, when Samus kills one of them, the other one becomes much faster and harder to kill.
  • Metamorphosis Monster: In Fusion, most Fune are replaced by Namihe after a certain point in the game. This implies that Namihe is the mature form of Fune, much like how Kihunter is revealed to be the mature form of Zero in the same game.
  • Mook Promotion: While Namihe and Fune were regular enemies in Super Metroid and Metroid Fusion, they were promoted to a Dual Boss in Metroid: Other M.
  • Shock and Awe: The projectiles they shoot are depicted as electric in Other M.
  • Swallowed Whole: In Other M, after fully emerging from the walls, a Namihe or Fune can swallow Samus whole and then spit her out.
  • Took a Level in Badass: The natural Namihe and Fune in Norfair are fairly passive creatures that reside in walls and occasionally spit fireballs. In contrast, the specimens encountered later on the BOTTLE SHIP and BSL Station are much more aggressive. In the former, they can even fully emerge from the walls and no longer need to hide.
  • Whack-a-Monster: Similar to Botwoon. In Other M, the Fune and Namihe hide in the walls and ceiling and occasionally emerge from holes to spit an electric projectile at Samus. When they emerge, that is Samus's opportunity to shoot them with missiles.
  • Xenomorph Xerox: The Fune is yet another H. R. Giger-esque design of an eyeless creature in the Metroid series. In particular, it resembles the Xenomorph's tongue, especially in the later games where it can extend its neck and emerge from the wall.

    Plated Beetle

A large species of beetle Samus fights in the Chozo Ruins.
  • Artificial Brilliance: If Samus stands somewhere it can't reach it burrows back underground rather than continue to try and chase her, preventing her from simply getting to a higher vantage point and shooting it in the weakpoint without risk.
  • Attack Its Weak Point: The front plating of its carapace is invulnerable to all of Samus's weapons, but is abdomen is not.
  • Bizarre Alien Biology: It lacks any visible mouth or sensory organs and its front carapace seems to be made of metal.
  • Degraded Boss: Later in the game, a plated beetle replaces the normal beetles in the main plaza of the ruins and will respawn just like any other common enemy.
  • Ramming Always Works: Its only attack is to charge Samus.


An apex artic predator encountered by Samus in the Phendrana Drifts.
  • Armless Biped: Its young even provide the current page image.
  • Attack Its Weak Point: After using its breath weapon the sheegoth hyperventilates, leaving its mouth vulnerable. Alternatively, careful morphball rolling can allow you to attack a sheegoth's belly. For the young, it's the icy shells on their backs.
  • Breath Weapon: It can spray a mist in an arc that freezes Samus solid.
  • Degraded Boss: After getting the plasma beam, adult sheegoths can be found in many of the rooms where baby sheegoths used to be and some where they weren't.
  • Energy Absorption: All beams but the plasma beam will be drawn into the crystals on its back, absorbed, and spat back out as orbs of energy.
  • Extra Eyes: As adults, sheegoths have six eyes. Scans also show what seems to be yet another set of eyes that aren't visible on the creature itself, though those may be some other form of sensory organ.
  • Eyeless Face: Younger sheegoths have shells of ice that cover most of their heads, including their eyes.
  • Mighty Glacier: As adults they can pack a mean punch but they don't move very fast, besides for the occasional quick burst. Babies are a little more agile but all sheegoths are poor jumpers. Retreating to higher ground will cause adults to stomp the ground, creating tremors that gradually draw prey towards the edge.
  • No-Sell: Any beam weapon but the plasma beam will just be absorbed by the crystals on its back.
  • Spikes of Villainy: Adults have crystalline spikes growing from their backs. The scan images show these are actually the outer layer of the bony spikes that eventually grow from the nubs found on the backs of the young sheegoths.
  • Super Drowning Skills: They do not do well in water.
  • Super Spit: It can launch ice balls if you stay out of range for its frigid breath and it does not feel like charging after you.

    Charge Beam Beast

A burrowing creature that holds the charge beam.
  • All There in the Manual: Its English name is derived from the official Nintendo Power guide for Zero Mission, while its Japanese name (Deiorumu) is from the Zero Mission website.
  • Cowardly Boss: It flees the battle if Samus doesn't kill it quickly, and then she needs to track it down again.
  • Creepy Centipedes: Definitely evocative of one.
  • He Was Right There All Along: When Samus first enters Corridor No. 5, the room is shaking due to the Charge Beam Beast's presence, but it will not emerge to attack until Samus grabs the Missile Tank and attempts to leave the room.
  • Go for the Eye: It can only be damaged with missiles aimed at its open eye.
  • Recurring Boss: It reappears several times if the player doesn't kill it and it retreats.
  • Skippable Boss: Since the Charge Beam is not required to beat the game (unless going for 100%) and the Charge Beam Beast can end the battle early by fleeing, it's entirely possible to beat the game without defeating the Charge Beam Beast.
  • Spike Shooter: Fires off a sharp something while it's eye is closed. Accuracy is about as poor as you'd expect.
  • Super-Persistent Predator: It attacks Samus many times if she doesn't kill it.
  • Tactical Suicide Boss: It would be invincible if only it wouldn't open its eye.
  • Tunnel King: It's capable of burrowing through the ground extremely rapidly.

    Acid Worm

A massive worm that lives in an Acid Pool in Kraid's Lair. Samus encounters this beast shortly after activating the area's zipline system.
  • All There in the Manual: Its English name is derived from the official Nintendo Power guide for Zero Mission, while its Japanese name (Mua) is from the Zero Mission website.
  • Attack Its Weak Point: The bulbous sacs below its mouth are its only vulnerable spots.
  • Big Creepy-Crawlies: It resembles a large worm.
  • Bullfight Boss: After snapping its jaws, it lunges out of the acid pool to attack Samus. Therefore, an effective strategy is to jump out of the way just before it lunges, and then Attack Its Weak Point before it retreats again.
  • Informed Attribute: Its title on the Japanese website translates to "Lava's Corruption", but the Acid Worm itself is not associated with lava (a separate substance from acid) in the game itself.
  • Personal Space Invader: Its primary attack is grabbing Samus with its jaws and then pulling her into the Acid Pool.
  • Super Spit: One of its attacks is spitting globs of acid at Samus. It will perform this attack if she is too far away for it to lunge at.


A bee-like monster fought in Ridley's lair.
  • Androcles' Lion: Subverted. Samus saves it from being consumed by tangle vines as a larva, but it's out for her blood as an adult.
  • Bee Afraid: It looks like a giant alien bee.
  • Extra Eyes: It has eyes running the length of its body.
  • Mama Bear: It attacks Samus when she crushes its eggs underfoot.
  • Monster Is a Mommy: It has several eggs in the chamber it fights Samus in.
  • Purple Is Powerful: It's an apex predator with a purple carapace.
  • Ramming Always Works: Its most common attack it to strafe the ground and try to ram Samus.
  • Spike Shooter: Later in the fight, it fires stingers at Samus.

    Alpha Blogg

A dangerous aquatic predator Samus fights in the Torvus Bog.
  • Attack Its Weak Point: The inside of its mouth, vulnerable only when its charging at you.
  • Interface Screw: It has a sonic attack that breaks lock-on, dismisses Samus's weapon charge, and turns her views briefly into static.
  • King Mook: It's a more dangerous blogg with some extra tricks.
  • Lone Wolf Boss: It's the only boss fought in Echoes that isn't used by Ing in some way besides Dark Samus and the caretaker droid. And even the latter at least belongs to a faction.
  • Make Me Wanna Shout: It fires projectiles that the scan data says are sonic disruption blasts.
  • More Teeth than the Osmond Family: It has three jaws and they're all packed with jagged teeth.
  • Ramming Always Works: Its most common attack it for to swim straight for Samus, jaws wide open, to try and ram her.
  • Sequence Breaking: By utilizing a jump trick, players can escape the battle without actually beating it.
  • Turns Red: When it gets low on health the time between its charges becomes much shorter and it doesn't open its jaws until the last second, making it much harder to hit and avoid.
  • Underwater Boss Battle: The only one in the whole Prime series, in fact.

Artic on top, Fire on bottom

Silicon based predators that live in extreme environments found in the Alimbic System. Two are fought over the course of the game, a fire spawn on Alinos and an artic spawn on Arcterra.
  • Elemental Powers: They launch projectiles of fire or ice that deal additional effects. The fire spawn's projectiles light Samus on fire and damage her over time, while the artic spawn's freeze her solid and leave her helpless.
  • Eyeless Face: Neither spawn has eyes.
  • Flower Mouth: Pretty much their entire heads.
  • Logical Weakness: They're weak to weapons utilizing temperature extremes they aren't used to. The fire spawn is weak to the cold-based Judicator, while the artic spawn is weak to the high-temperature Magmaul.
  • Magma Man: The fire spawn's appearance gives this impression, as well as the fact that it lives in a pool of lava.
  • Silicon-Based Life: The fire spawn's scan says it is particularly unfriendly towards carbon based life forms, which could be a joke but its molten lava dwelling is a common indicator for "silicon based organism". The rationale behind the arctic spawn is not as clear.
  • Tunnel King: The artic spawn can quickly burrow into the ground and reemerge.

    Brug Mass 

A mass of insectoid creatures gathered around a king brug to form a composite body.
  • Attack Its Weakpoint: The eye, actually the king brug.
  • Combat Tentacles: It has these for arms.
  • Decapitated Army: After Samus kills the king, the rest scuttle away harmlessly.
  • Eyes Do Not Belong There: The king brug has a large eyeball on its back.
  • Four-Legged Insect: The brugs that make up its body have four legs. Justified, as they're alien creatures and never actually referred to as insects.
  • Goomba Stomp: After its arms are destroyed, it hops around and tries to crush its enemies underfoot.
  • King Mook: The king brug, which forms the creature's eye.
  • The Only One: If you wait long enough while the brug mass is frozen, the marines will try to overblast it. It easily shakes them off, leaving the task up to Samus.
  • Worm That Walks: It's a towering creature composed of a swarm of smaller bugs.


A creature dwelling in a volcano caldera in Sector 3.


A large creature that lives in lava that Samus fights in Sector 3 of the Bottle Ship.
  • Attack Its Weak Point: A number of purple nodules on its stomach serve as its weakpoint.
  • Extra Eyes: It has eight eyes. How it uses them considering it lives in lava, which isn't exactly transparent, isn't quite clear.
  • Fish out of Water: A literal example. Samus can sue the grapple point stuck in its teeth to drag it out of the lava and leave it flopping helplessly on land.
  • Lava is Boiling Kool-Aid: It swims through lava like a shark swims through water, without being hindered by density or temperature.
  • Super-Persistent Predator: It really does not like Samus. In her first moments in the sector it bites through a passageway to get at her and doesn't stop hunting her until she finally puts it down.
  • Throw Down the Bomblet: It drops fiery bombs as it leaps over the platforms Samus stands on.


Large aquatic creatures fought by the Federation Force on Excelcion.
  • Expy: Seaserpent-like creatures with an armored segmented appearance? You sure that isn't Serris?
  • Fusion Dance: When damaged enough, the two sawken will combine into a single larger creature.
  • Make My Monster Grow: They're not usually that big, the Space Pirates experimented on them to make them much larger.

    Rohkor Beetle

An absolutely gigantic creature that threatens a Federation data probe on Bion.
  • Advancing Boss of Doom: The longer the fight goes on, the closer it gets to the probe.
  • Attack Its Weakpoint: The inside of its mouth is the only place that can hurt it.
  • Breath Weapon: A laser it sweeps across the area in front of it.
  • Eye on a Stalk: Its eyes are on short stalks.
  • Four-Legged Insect: It has four legs, yet it's called a beetle.
  • Kaiju: Even compared to the Golem troopers, who are already much larger than usual due to their mech suits, this thing is huge.
  • Knee Capping: Its knees are weakpoints. Destroying all of them will temporarily immobilize it and cause it to keep its mouth open.
  • Mook Maker: It spawns and summons various other creatures to aid it.
  • Not Quite Dead: After the Federation Force severely wounds it and it collapses, it tries to get back up. It takes a Gunship Rescue from Samus to finally put it down.


Debut: Metroid Prime: Hunters
"Without warning, our doom fell from the sky. From whence it came we do not know. The horror shrieked its name: GOREA. Gorea is power beyond reckoning and evil unrelenting. The universe has not known terror such as this. At first we thought Gorea was a comet. It crashed upon our planet and emerged as a vapour, it mimicked our cellular structure and replicated itself in solid form. We have seen Gorea alter its atomic structure between polarizing states. Our scientists believe it may also possess other SHAPE-CHANGING abilities. We deployed our deadliest weapons to defeat the beast. To our horror, every weapon was somehow used against us. The war only lasted a few standard galactic months. Even with the galaxy's most powerful technology at our disposal, we fell like dry grass beneath the blade. For Gorea was immune to even our most sophisticated weaponry, while we were defenseless against its relentless attacks. It devoured our people's life energy and grew even more powerful from such sustenance. Death swept across our worlds, and we despaired. We feared not only for the extinction of our race and our galaxy, but the possibility that the evil would sweep across the entire universe, annihilating all in its path. We gave our lives to confine the foul monstrosity known as Gorea. Do not seek this creature unless you have the means to DESTROY it."
The Alimbic Order of Elders
A mysterious being that arrived in the Alimbic System and began laying waste to all it found. The Alimbic managed to seal it away in a pocket dimension called the Oubliette, from which it managed to send a message intended to incite others into inadvertently freeing it.
  • Alien Geometries: It can throw rocks through walls and through floors while leaving them intact.
  • Arm Cannon: Both arms of its first form are type 1s.
  • Barrier Change Boss: For most of the first phase.
  • Batman Gambit: It sent the distress signal to all of the Hunters in the galaxy so that they would find the Octoliths and set it free. It even managed to get Hunters with weapons equivalent to the now gone Alimbics, to make assimilating them that much easier.
  • Big Bad: Of Hunters.
  • The Chessmaster: It engineers its escape with a single sentence.
  • Cognizant Limbs: While Hunters has no lock-on feature, Gorea's arms have their own health bars. As does the seal sphere.
  • Combat Tentacles: Either this or a Tractor Beam, depending on how you interpret it. Either way, Gorea can drain Life Energy with them and assimilate weapon systems this way. Can't get Samus's power beam, which unfortunately won't do any meaningful damage anyway.
  • Curbstomp Battle: The fight between it and the other antagonists of the game sees Gorea win pretty easily, the other antagonists being all six of the other hunters at once.
  • Damage-Sponge Boss: Standard for the Prime series, Gorea takes a lot of damage before its first form goes down. The second form, being weak to the Omega Cannon, is an aversion.
  • Despair Event Horizon: The survivors of its initial assault were said to seem lifeless, even if they weren't injured.
  • Dishing Out Dirt: Its second phase does this.
  • Eldritch Abomination: Was originally this, but became a Humanoid Abomination after stealing that form from the Alimbics. It degenerates a little as you fight it, though.
  • Floating Limbs: Its head, much like Trace.
  • "Get Back Here!" Boss: The only way to defeat its final phase is to let it run, track it down and then repeat the process. It will immediately appear when you can't hurt it but as soon as you can it will vanish before any damage can be done, forcing you to find it the hard way.
  • Guide Dang It!: How to unlock its final phase. More specifically, you have to shoot a number of colored panels on the walls of its arena in a certain order with the proper weapons corresponding to the color of the panel. This is actually hinted at in several of the logbook scans, but it's so vague that most people needed a guide to figure it out anyway.
  • Homing Boulders: Samus is perfectly capable of dodging them, or simply shooting them before they reach her, but that doesn't change the fact the boulders launched by Gorea travel in trajectories that should be impossible.
  • Improvised Weapon: It likes throwing the frozen colonies of cyanobacteria that float around in its prison.
  • Mega Manning: Its first phase sees it steal and use weaponry. Oh, and most of the weapons it employs are much more dangerous when in Gorea's possession, except possibly the shock coil. Also, it ends up using the seal sphere meant to seal off its powers as a battery to siphon energy off of and continue on with.
  • One-Winged Angel: In its second form it trades its versatile weaponry for flight, teleportation, and Reality Warping attacks.
  • Only a Flesh Wound: Blowing off its arms doesn't bother it much in fact, the limbs are the only thing Samus's weapons can damage. The final stage is against a flying torso! If you're not quick, it will grow its arms back too.
  • Oubliette: Tailor-made cans hold it and the remain Alimbics.
  • Sealed Evil in a Can: Apparently no one thought to gag it though, since it can still talk or otherwise send messages.
  • Sealed Good in a Can: One of these acts as its Restraining Bolt.
  • Soiled City on a Hill: The Alimbics got invaded by aliens. They built a lot of weapons, chased out the aliens, declared themselves invincible, and told everyone to stay away. Gorea then came and wrecked everything.
  • Starfish Alien: Don't let that picture fool you. That's just a familiar form it took on to make the Alimbics uncomfortable.
  • Suicidal Overconfidence: Not really, which makes it more annoying once it truly realizes something can hurt it.
  • Telepathy: How it communicates.
  • Tripod Terror: Its initial form has three legs. Unlike Metroid Prime it's as slow going forwards as you'd expect, although it pivots very well
  • Verbal Tic Name: The Alimbics call it the first thing it said.
  • Villain Teleportation: Once you unlock its final stage, though it mainly just uses this to stay out of Samus's crosshairs.


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