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Various alien creatures in the series, with little purpose to their existence other than to feed and/or survive.


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Original Series

    The Metroids 
"The dominant species of planet SR388, Metroids are energy-based parasitic predators. A Metroid will latch onto its prey and drain energy, growing larger as it does. The only way to shake an attached Metroid is to enter Morph Ball mode and lay a Bomb."
Metroid Prime's Logbook

The series' eponymous bio-form, engineered by the Chozo for the sole purpose of combating the most dangerous parasitic organism in the universe. The X. As an energy leeching predator, they either hatch from eggs laid by a Queen and evolve through a complicated metamorphosis into beasts capable of untold destruction, or divide by mitosis upon exposure to Beta rays; and are therefore an object of power to those who would harness their incredible abilities for war and profit. Or else revolutionize energy usage and consumption till the end of time.
https://static.tvtropes.org/pmwiki/pub/images/sv_metroid_sm_2053.png
"Skreee!"

  • Achilles' Heel: They're really weak to ice attacks, but the SR388 and Tallon IV strands outgrow this weakness eventually, trading it for others. The Super Metroid was also ice beam proof but Mother Brain managed to kill it, and that was after she lost the hyper beam.
  • Antagonist Title: Though unusually, not the main antagonists.
  • Asteroids Monster: Fission Metroids split into two Metroids when killed, each of which is only vulnerable to a specific beam weapon.
  • Attack Animal: For the Chozo. The space pirates and Ing, not so much.
  • Batman Can Breathe in Space: Phazon Metroids, which to be fair, may be because of their ability to leave local spacetime, but Miniroids do it too without that benefit.
  • Bizarre Alien Biology: They are flying jellyfish with mouths like leeches and weakness to cold and/or missiles.
  • Bizarre Alien Reproduction: They usually have two known methods of reproduction, with their "normal" one being eggs laid by the Queen, who seemingly doesn't need any help to fertilize her eggs, and an alternative method being fission after exposure to Beta rays. This isn't even getting into how the Phazon mutated variants are able to propagate.
  • Boss in Mook's Clothing: First two games, of the wolf pack variety.
  • Combat Tentacles: Hunter Metroids and Metroid Hatchers.
  • Depending on the Writer: The Omega Metroid and Queen Metroids of Fusion and Other M are nothing like their original counterparts from Metroid II, beyond basic appearance. This can be explained by Fusion and Other M having a different director than Metroid II.
  • Endangered Species: After Metroid 2, which is after Zero Mission and the Prime Trilogy.
  • Even Evil Has Loved Ones: As the Hatchling proves, Metroids are capable of emotional attachment and bonding, particularly right after hatching. The hatchling never evolves beyond the larval stage (only growing larger), so we never see whether or not the bond sticks through other stages of maturity. Also, this only applied after all other Metroids (including the Queen) were dead.
  • Everything's Better with Dinosaurs: The Zeta, Omega, and Queen Metroids are basically alien dinosaurs.
  • Evolution Powerup: Instantly adapt to whatever planet they're brought to. The ones on SR-388 are different from the ones from Zebes are different from the ones on Tallon IV are different from the ones on Aether... And that's not counting the ones on Bottle and Biologic Space Lab (GMO's) or the ones on Dark Aether (symbiotes with Ing).
  • Face Hugger: Well, mostly a Head Hugger.
  • Gone Horribly Wrong:
    • They were created by the Chozo to act as predator to the X Parasites on SR-388. This worked pretty well, but then the Metroids ran out of X to eat, so they moved on and began to feed on any other lifeform they could. Fortunately, it is implied that the Chozo fully anticipated this, and raised Samus with the expectation that she would combat the Metroids too.
    • The infant Tallon Metroid, a state that exits the egg less developed than even a larval Metroid. The Space Pirates created this state to be more manageable Metroids, with the idea they would serve as portable batteries, unfortunately Infant Tallon Metroids are mindlessly aggressive, flinging themselves with reckless abandon at all living things and can mature beyond the larval stage within seconds if they make contact with a large enough concentration of phazon (a puddle is enough).
  • Ground Pound: How Hopper Metroids attack after entering hyper mode.
  • Homing Projectile: The Queen Metroid shoots them in The Return Of Samus.
  • I Believe I Can Fly: Unless explicitly told otherwise, never assume any of them are ground bound, even if they look like it or have spent a large amount of time not in the air.
  • Insectoid Aliens: Alpha and Gamma Metroids fall into this category.
  • Intangible Man: Phazon Metroids hatched by the Metroid Hatcher that can only be killed with Hypermode.
  • Joker Immunity: They are almost as bad as the Daleks in terms of going extinct and coming back - though the Daleks don't have the on-screen justification of total idiots trying to clone them.
  • Kill It with Ice: Though at first it was just "freeze them before a shower of missiles" - and even then, in the first game they thaw out faster than any other freezable thing in the game. Later games makes them weak to cold (although in Metroid II, only infants and larva take such damage).
  • Ledge Bats: Fission Metroids in the Impact Crater in Prime. They obscure your visor when they latch on, making jumps even harder, the morph ball tends to roll off slope and they can lift the morph ball as well as the bouncing bomb explosions to detach them cause.
  • Life Drinker: They prefer to eat Life Energy, and it's never proven if they can die from old age. They can drain all types of energy but they'll get sick if they only eat electricity, for example. The Ing used them for their ability to feed directly off Phazon and not die but had to be careful since Metroids still preferred to eat them.
    Pirate Notes: Metroid dissection continues to produce more questions than answers. Our research teams have isolated the energy conduits that run from the invasive twin mandibles to the energy core in the creature's quadripartite nucleus, but the manner in which the Metroid actually extracts the life force from its prey remains an utter mystery. The victim does not lose blood or any other vital fluids, and yet the Metroid extracts energy; identifying this energy is our central problem. It takes no physical form, and yet without it, the victim dies.
  • Mascot Mook: Being the namesake of the franchise, it makes sense that Metroids are some of the most iconic creatures in the series.
  • Maybe Magic, Maybe Mundane: The Metroids drain an unidentified energy from their prey, and what this energy is may have been lost with the Chozo forever.
  • Living Battery: Super Metroid reveals that Metroids' ability to feed on ambient energy and impossibly efficient metabolisms make them an ideal power source.
  • Mega Manning: Metroid Prime and the Super Metroid both steal and assimilate weapons used by the Space Pirates.
  • Metamorphosis Monster: Their exact lifecycle depends heavily on their environment, with the conditions of their native SR388 producing the most dramatic transformations. SR388 goes Infant-Larva-Alpha-Gamma-Zeta-Omega with some becoming Queens. Tallon IV have even weaker than normal Infant stage before Larva, which becomes Hunter or Fission. In Corruption we see Mini-Phazon-Hopping-Hatcher and possibly Prime.
  • Miracle-Gro Monster: Instead of metamorphosing, the Super Metroid just kept getting bigger, actually surpassing a queen in size, being able to swallow Samus completely without the morph ball. Metroid Prime was also small at one point in time. Then there are the rapid maturing infant tallon Metroids, the Space Pirates failed attempt at a more manageable Metroid.
  • Monster Lord: The Queen Metroids. Mother Brain sorta plays this role in lieu of a Queen (she can effectively control them in the manga but not in the games). The Metroid Prime commanded a few as well.
  • Names to Run Away from Really Fast: Metroid is revealed to be Chozo for "Ultimate Warrior".
  • Not Always Evil: The hatchling is, to date, the only "good" Metroid the series has shown. It's unknown whether or not its attachment to Samus can ever be replicated, since at the time, it was the last known Metroid. In Other M, Samus makes an attempt to bond with another (cloned) baby Matroid, but it only saw her as food.
  • Our Monsters Are Weird: The people in the story itself cannot make much sense out of them.
  • Palette Swap: In the first game, red Metroids always seek out Samus, though lazily, while green Metroids are a little more likely lie in wait but charge much faster. Their absence in Zero Mission indicates Canon Discontinuity. Echoes has red variants of Tallon Metroids, however they behave no differently than green Tallon Metroids seen in Prime before it.
  • Personal Space Invader: They were worse in the first game where it took multiple bombs to dislodge them, which might result in you accidentally being blown back into their grip. It only takes one to get them off in Zero Mission.
  • Powerup Let Down: The stage between Phazon and Hatcher can't even fly.
  • Removed Achilles' Heel: The Space Pirates' long-term goals for the Metroids are to tame them so they'll follow orders and only attack other races, then remove their weakness to sub-zero temperatures, giving their organization an unstoppable army. In Other M, Adam and Samus find to their horror that the Federation has been thinking along similar lines, only with the utterly-suicidal oversight of having not trained the Metroids first, essentially taking a dreaded wild animal and making it invincible.
  • Shoddy Knockoff: In-universe, the Mochtroids are this to the genuine article. Sure, they drain Samus's energy, but they can't latch onto her properly, and they are weak against any weapon, not just ice and missiles. And they don't even have the right number of nuclei.
  • Stationary Boss: The Queen Metroid; if you can't beat it, you can leave and come back with more ammo.
  • Starfish Aliens: There is not a single thing in their biology that makes any sense by our standards.
  • Summon Bigger Fish: The basis of their existence.
  • Super Spit: An annoying trait of the SR388 Metroids as they develop.
  • Vampiric Draining: No puncture wounds though. Those teeth/claws are used for gripping their victim, not as the mechanism for the draining.
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    The Metroid Hatchling 
"I next fought the Metroids on their home-world of SR388. I completely eradicated them except for a larva, which after hatching, followed me like a confused child..."
Samus Aran

https://static.tvtropes.org/pmwiki/pub/images/flat550x550075f_6179.jpg
The Last Metroid

  • Androcles' Lion: A major plot element in the series. In Metroid II, Samus is tasked with exterminating the Metroid species, but stops at killing a newborn showing no hostility toward her. In Super Metroid, the baby is kidnapped, and Samus goes to get it back. Samus is eventually reunited with the Metroid, who is now gigantic after being nursed by the Space Pirates. It starts to swallow her, but recognizes her as its surrogate mother, and lets her pass. At the final fight with Mother Brain, the baby sacrifices itself to heal Samus and give her the hyper beam. This episode is the major thematic introduction for Metroid: Other M. Later in Metroid: Fusion, in a posthumous example, after Samus is infected by the X parasite, a cell sample of the same baby Metroid is used as part of the cure that destroys the parasites inside her and saves her life.
  • Big Damn Heroes: During the final boss fight of Super.
  • The Cavalry: And sort of continues to be posthumously.
  • Chekhov's Gunman: In Super Metroid you could get the brief impression Samus was going to drop it off and do something else but the whole game turns out to be about it, especially the end of it.
  • Heel Realization: Just as it's about to finish Samus off, it recognizes her as its "mother" and chirps apologetically.
  • Heroic Sacrifice: One of the most iconic examples of the medium.
  • Implacable Man: None of Samus's weapons can so much as slow down the Super Metroid, not power bombs, not the ice beam, not beam combos. Mother Brain had weapons able to damage it though and the hyper beam was not one of them in the original take as she killed it after it was stolen. (in Other M, Mother Brain uses the Hyper Beam to kill it, which begs the question of how exactly Samus got it? Maybe she's just remembering the events wrong?)
  • Insect Queen: Since Other M's Metroid Queen is cloned straight from the baby and only special infants have the genetic coding to become queens, it would appear that the hatchling was indeed an infant Queen. (Note to the Chozo, there is a reason real hive species don't work this way!)
  • Last of His Kind: At least until it is later cloned by the Federation, which still does not bode well for Metroids in the long run, if they are all descended from one individual.
  • What Measure Is a Non-Cute?: Subverted as far as Samus is concerned.
  • Your Size May Vary: In Super Metroid they were not kidding. It had grown gigantic, covers Samus completely as opposed to they way Metroids usually just latch onto her head and was half the size of Mother Brain. The Other M version is significantly smaller, half the size of Samus at best.

    The X 
"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

https://static.tvtropes.org/pmwiki/pub/images/79d77c7c2e56ee1baacdca190a0ea0e3_2162.jpg
Man, is the warmest place to hide.
Parasites that evolved on SR388, where they began to greatly endanger the planet's ecosystem by throwing it out of balance. 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, Rildey was killed off for real on Zebes, and Nightmare was 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.
  • Big Bad: Of "Metroid Fusion". It formed the SA-X, which 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 or mimic the body, typically while mutating the original form into something much worse. Samus doesn't have even have to be fully infected for this trope to come into play for her.
  • 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.
  • Enemy Mine: The SA-X decides to assist Samus in destroying an escaped Omega Metroid, apparently considering it to be the greater threat. Justified in that SA-X is an X-Parasite doppleganger and Metroids were engineered to be their predator.
  • 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. This could only go so far, though, since Metroids outgrow their ice weakness anyway.
  • 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.
  • 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.
  • Implacable Man: The SA-X. 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.
  • 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.
  • 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.
  • Stealth Pun: The X infect a machine with the acronym B.O.X. So, it's the X-Box. Core X come in two varieties, referred to as Fast and Hard. Fast X and Hardcore.
  • 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.

Ing

    The Ing 

The Ing

"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."
U-Mos

https://static.tvtropes.org/pmwiki/pub/images/ing_warrior_1736.jpg
'Ing' means terror

  • 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 portals. They primarily use this tactic to push targets out of safe zones.
  • Bee People: They behave like them.
  • Big Bad: Emperor Ing in 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.
  • 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.
  • 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.
  • 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: 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.
  • Mecha-Mooks: They quickly learn how to possess machines created by the Luminoth, and promptly turn them against their creators.
  • 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.
  • 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.
  • Wall Master: Darkling Tentacles
  • Weakened by the Light: Aether's atmosphere is just as dangerous to the Ing as Dark Aether is to Aether creatures, and light energy 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.

     Amorbis 

https://static.tvtropes.org/pmwiki/pub/images/amorbis_by_razputin93-d7886ac_1300.jpg

  • 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.
  • Call-Forward: The destruction of the dark sphere looks just like that of Zebes.
  • 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.
  • King Mook: They're giant Sandiggers.
  • Pivotal Boss: While using dark attacks.
  • Sand Worm: While not to Dune levels, they are close. Very large sand worms Amorbis are.
  • 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.
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     Chykka 

https://static.tvtropes.org/pmwiki/pub/images/chykka_by_rundash-d52w20x_4982.jpg

  • 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.
  • 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: Some ing-possessed creatures may show up while you fight it; naturally, they focus on you, not the giant bug that provoked them.
  • Eyeless Face: The larva form.
  • 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).

Phazon

    Phazon 
"Darkness... coming..."
Aurora Unit 313

https://static.tvtropes.org/pmwiki/pub/images/phazon_9554.jpg
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.

  • Applied Phlebotinum: It's a mutagenic substance that the Space Pirates exploit for a power-up.
  • 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 it, turning the corpse into Phazon. Fitting, considering it's status as The Corruption.
    Cradle: "It eats relentlessly, worming out life wherever it blooms and corrupting what it cannot kill."
  • 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.
  • 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. It 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.
  • The Virus: Long term exposure that does not result in death changes organisms for the worst. It becomes even more so when space pirates start using an actual virus to infuse a strand of it into creature's DNA. Ironically the literal viral phazon has a much lower fatality rate. Once Phaaze produces a mature Leviathan, it travels towards a suitable planet to infect, then it starts to spread Phazon until the planet is essentially another Phaaze.
  • 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 and 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 could arguably be made out of literal pure evil, and are in fact 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.

    Metroid Prime / Dark Samus 
"Investigations into a possible ingress point for the impact crater continue to meet with failure. The shield of strange energy that protects it is impermeable, and all attempts to tunnel past it have proved fruitless. Our continued futility in this matter is made all the more significant in light of recent life form readings we've discovered emanating from deep within the crater. Analysis of the readings indicates that a massive creature is gestating in there, absorbing enormous amounts of Phazon from the Phazon core at the heart of the impact crater. This discovery makes accessing the crater doubly important - not only will it open the door to the vast deposits of Phazon within, but it will also lead us to this creature, whatever it may be..."
Log 11.156.9

"Our scanners have detected the remains of Dark Samus, who has revived herself within our Phazon storage. Surely, we are cursed. The fiendish shrew consumed all of the Phazon, then wiped out a third of the crew in a matter of minutes. Now she moves at will through the halls of Colossus, using her witchery to beguile the minds of my men. We are unable to call for aid, and only a few of us remain to stand against her. All is lost."
Captain's Log

A metroid that encountered a strange meteor that landed on Tallon IV. It is the reason Tallon IV is slowly being corrupted by the Phazon but Samus manages to stop its ingress by recovering the Artifacts and fighting it within the Impact Crater.

Though it was thought destroyed by Samus, the remains of its body fused with Samus's stolen Phazon Suit and traces of her DNA, being reforged and reborn as "Dark Samus", a being that has same abilities as the Hunter but empowered with Phazon. With its newfound power and intelligence, it now seeks to find the source of the Phazon and harness it for its own gain.


https://static.tvtropes.org/pmwiki/pub/images/the_true_essence_by_chrysaetos_pteron_3254.png
The Core Essence
https://static.tvtropes.org/pmwiki/pub/images/need____more____phazon____by_larosenoire1989-d4d3lrx_5965.jpg
The Black Demon
  • A God Am I: She takes over the Space Pirates in Corruption and forces them to worship her.
  • Antagonist Title: Metroid Prime is the Final Boss of the eponymous first game of the series, and technically remains as Dark Samus for the other two games.
  • Arc Villain: Of the trilogy, as it wants to spread Phazon as far as possible.
  • Ax-Crazy: Dark Samus during the events of Echoes was certainly depicted as being completely insane, namely due to being imbalanced at a molecular level, almost to Kefka Palazzo levels.
  • Bag of Spilling: Just as much as the real Samus, it seems.
  • Barrier Change Boss: And it is foreshadowed in some Pirate data, too.
  • Big Bad: Of the Metroid Prime Trilogy. She manages to fight Samus multiple times and survive, something only Ridley accomplished prior, she manages to survive a destablizing dimension, gets revived in Corrruption and manages to take control of a whole planet of Space Pirates, including RIDLEY, curb-stomps and corrupts all four Hunters and manages to turn three of them against Samus. Put simply: Ridley might be Samus's nemesis, but Dark Samus is arguably her most powerful opponent yet.
  • Breath Weapon: As Metroid Prime she can spit an ultra-frigid breath from a "mouth" on the underside of the armor stolen from the Space Pirates.
  • Broken Bridge: Invoked and subverted in that Samus is able to cross the gap despite her efforts.
  • The Chessmaster: In Echoes she lures Samus into an Ing ambush at their first meeting, but it's in Corruption that she really displays this. She takes control of the Space Pirates and the planet Phaaze; attacks three specific planets to cripple the Galactic Federation by removing their spy satellite network, fuel reserves, and garrisoned forces; and infects Samus and the other Hunters with Phazon corruption ensuring its only a matter of time before they're all under her control.
  • Dark Action Girl: Sadistic and violent, Dark Samus is the antithesis of Samus Aran.
  • Combat Tentacles: Can project these from her armor. In fact, these are how Dark Samus was made!
  • Curbstomp Battle: Her skirmishes with the space pirates on Aether all see her quickly cut through them. Then she applies it to the Hunters from Prime 3, in case anyone had doubts about her threat level already.
  • Deflector Shields: Has them at a couple points.
  • Demonic Possession: Tries her hand at it in the third game.
  • Determinator: No matter how many times she is put down in Echoes, she keeps on coming back to manipulate the Aether situation to siphon as much Phazon as possible.
  • Does Not Like Shoes: To emphasize her savagery and insanity, she's notably barefoot half of the time.
  • Doppleganger Attack: In Corruption, and it calls back to Echoes despite not being present there.
  • Early-Bird Boss: Some of her abilities are things Samus could duplicate or at least counter if the power-ups were present in the Prime series. She also uses super missiles long before the player can get them.
  • Evil Makes You Ugly: The Final Boss battle in Echoes has Dark Samus visibly disfigured by Phazon overload (and the Skull for a Head even brings a Call-Back to the original Metroid Prime)
  • Evil Counterpart: Dark Samus is an obvious one, but even the original Metroid Prime had similarities to Samus. Both wore mechanical suits with similar abilities (the beam weapons, missiles, the tractor beam attack similar to the grapple beam) and a blue 'true form' under it (the Essence for Metroid Prime and the Zero Suit for Samus).
  • Evil Knockoff: Though unlike the SA-X from Fusion, Dark Samus isn't quite as much of a carbon copy, seeing as it used to be a Metroid and has several distinct abilities.
  • Eviler Than Thou: Even though she initially helps the Warrior Ing attack Samus, some of the space pirates she is seen fighting with over some Phazon were Ing possessed, suggesting one of them went back on any possible deals that could have been made. Since Ing don't make much use of the phazon they already have, it can be assumed they were simply trying to halter Dark Samus. She then takes control of the source of Phazon in Corruption!
  • Eyes Do Not Belong There: If one pays attention, they will notice her final form in Echoes has eyes on the back of her hands! Her Morph Ball form even has eyes on each side of the sphere.
  • Flight: A consistent ability she keeps after developing that Samus doesn't really have, though at points she can only hover over the ground.
  • From a Single Cell: Or single Phazon particle...Echoes claimed that nothing short of "total atomic disruption" would finish her for good and she survived the destruction of Dark Aether, an entire separate dimension. It takes destroying every bit of phazon in the universe to finally kill her.
  • From Nobody to Nightmare: As Metroid Prime she had some major significance, yes; but in the grand scheme of things she was the byproduct of just a random Leviathan. And then Dark Samus would go on devising a way to become the very mind of Phaaze itself...
  • Galactic Conqueror: She tries her best in Corruption, and very nearly succeeded.
  • Going to Give It More Energy: Played with throughout the trilogy. Overloading it with its own Phazon energy will cause its physical form to be destroyed, but doing so does nothing to prevent it from reviving itself and regenerating back to normal. As Dark Samus, she continually absorbs Phazon to grow stronger, but ends up destabilising her body in the process. However, by the third game she manages to maintain her composure and can absorb Phazon directly from its source with no negative effects. In the end, it takes destroying the very source of all Phazon in the universe to destroy her, which is done by overloading its controller with Phazon energy.
  • Hero Killer: Not only does she terrify the prophetic Chozo, tear through the pirates, casually dispatch Ing, break Luminoth technology and take over two planets but she also takes down four named characters in Corruption.
  • Hoist by Her Own Petard: Subverted all three times. She can't necessarily help being majorly composed of the thing to defeat her with, can she?
  • Homing Projectile: The particle wave generator, stolen from the pirates, makes these. Also the core form in Prime Pinball could shoot some from her tentacles.
  • Humanoid Abomination: She started out as a Metroid heavily mutated by prolonged exposure to Phazon before being destabilized and exploding. Absorbing Samus' Phazon Suit enabled her to reform as a black, biomechanical doppelgänger of Samus bent on spreading Phazon throughout the universe and even other dimensions, and she was unkillable as long as Phazon existed.
  • Implacable Man: Best displayed after beating her at the end of Metroid Prime 2, where she uses the last of her strength to crawl and attempt to grab Samus one last time. Similar to another Implacable Man. Then she returns in Metroid Prime 3 more dangerous than ever.
  • Invisibility: She tries a few different forms of it, to counter Samus's constantly updating methods of tracking.
  • Joker Immunity: She can reform herself from phazon particles. You destroy her for good in Prime 3, though.
  • Laser Cutter: Her version of the charge beam. Rather than draw energy for a larger blast, she shoots a continuous blast and sweeps with it.
  • Laughing Mad: Dark Samus often laughs rather maniacally in some of her appearances in Echoes. For a "woman" her voice is pretty deep. By Prime 3, it's ascended to one of her main forms of "battle dialogue".
  • Load-Bearing Boss: In the first and third games. As Metroid Prime, her defeat made the Impact Crater presumably cave in on herself. In Corruption, her death makes Phaaze die because she merged with the device she was using to control it, one assumes. Averted in Echoes, because the Load-Bearing Boss had already been killed.
  • Made of Phlebotinum: Dark Samus is made of Phazon.
  • Mega Manning: First some space pirate armor and weapons, then the phazon suit, and finally she acquires the abilities of other Hunters besides Samus during the events of Metroid Prime 3 Corruption.
  • Mind Control: Does a whole lot of it later.
  • Mook Maker: As the Metroid Prime she was a Metroid maker, and as Dark Samus in Corruption she could produce copies of herself.
  • Nigh Invulnerable: Conventional weaponry is useless against her once she absorbs enough Phazon; only Phazon-powered weapons have any real effect, and even then she takes a massive level of punishment before going down. Best shown in Corruption during the final battle, where despite the fact Samus is in permanent Hypermode and discharging Phazon attacks like there's no tomorrow, Dark Samus takes damage comparable to what standard weaponry does to most foes.
  • Pet the Dog: Despite her psychopathic nature, she actually shows some degree of compassion towards Metroids held captive by the Space Pirates in the second game. This makes sense because she is a Metroid. It's also implied that she was responsible for bringing Metroids to Phaaze, where the creatures seem to thrive judging by the absurd number of them.
  • Phlebotinum Dependence: Her Metroid nature allows her to absorb Phazon and grow more powerful. She spends most of Echoes seeking out Phazon deposits to absorb in between fighting Samus. By Corruption she decides to stop seeking existing Phazon and instead turn every planet in the galaxy into pure Phazon.
  • Pistol-Whipping: It is not entirely clear if her cannon makes contact, but she has a striking move she'll use on players who don't keep their distance as well as to stop their missiles, forcing them to wait for an opening if they are determined to hit her with them.
  • Poisonous Person: Heavily infused with phazon but beyond that, she used to have missiles that left behind damaging green clouds. Green being a video game shorthand for "poison".
  • Power Parasite: She absorbs each of the other three bounty hunters in Corruption after their defeats and uses variations of their techniques during the final battle: Phazon pillars similar to Rundas' ice ones; Ghor's plasma beam, and Gandrayda's ground-based energy wave attack.
  • Powered Armor: As Metroid Prime she was covered in an exoskeleton of assimilated Space Pirate technote  As Dark Samus she was clad in a biomechanical version of Samus' armor.
  • Recurring Boss: Throughout the trilogy
  • Red Baron: She is referred to by the Space Pirates as the Dark Hunter. After she took over, they take to calling her the Dark One, and the Black Demon. note 
  • Sanity Strengthening: She starts out as being completely insane in Echoes. By the time of Corruption, however, she has become sane enough to make complex plans that ensure that she succeeds, although she does retain a high degree of instabilitiy.
  • Shadow Archetype: To Samus, obviously, but given the series continuity, this is partly retroactive. In Fusion, Samus talks about how the SA-X must be stopped before it ever realizes its potential and becomes a threat to the galaxy, which is exactly what we see Dark Samus do. The kicker is that by becoming part Metroid, she is even more like Dark Samus, despite having an opposite motivation, and is fighting what functionally might as well be her old self, since it has most of her old abilities.
  • Short Range Shot Gun: Cruelly averted, she has a scatter shot version of the power beam fans call the "shrapnel beam". It's about as easy to dodge as it sounds (not at all without cover).
  • Suspiciously Similar Substitute: Of SA-X. Although Retro declared more influence from the "mirror boss battle" in Zero Mission. That said, Fusion was in development before Prime, and they were handled by different teams, so it's a bit nebulous which is the substitute of which.
  • Wave Motion Gun: The armored form of Metroid Prime has one whose color depends on the current barrier, and both forms of Metroid Prime in Metroid Prime Pinball regularly let off powerful shots that can quickly kill you.
  • Wrong Genre Savvy: Despite her name and her comfort in its atmosphere, Dark Samus is not from Dark Aether nor is she a Darkling, but a Metroid from Tallon IV, meaning the Light Beam is worthless against her, but the Dark Beam is devastating.
  • You Will Not Evade Me: Formerly, with a "snare beam".

     Flaahgra 

https://static.tvtropes.org/pmwiki/pub/images/flah11tugd_8280.jpg

  • 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.
  • 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 int the Chozo Temple (which disappears once it's defeated), it is not the great poison referenced in these scans..
  • 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.
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