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Main Character Index | Samus Aran | Metroids (Prime) | Space Pirates (Mother Brain | Ridley) | Galactic Federation | Chozo | Bounty Hunters | Other Antagonists | Others | Noncanonical Characters

Debut: Metroid 1
"The Chozo... Over millennia, this bird-like race of creatures made incredible technological and scientific leaps. Traveling at will through space, they built many marvels across the Universe. Technological wonders of unfathomable complexity and cities unmatched in beauty. They shared their knowledge freely with more primitive cultures and learned to respect and care for life in all its forms. Even as their society reached its technological peak, the Chozo felt their spirituality wane. Their culture was steeped in prophecy and lore, and they foresaw the decline of the Chozo coinciding with the rise of evil. Horrified by the increasing violence in the universe, they began to withdraw into themselves, forgoing technology in favor of simplicity. Tallon IV was one of the several refuges they built — a colony bereft of technology, built of natural materials and wedded to the land and its creatures."
Metroid Prime Manual
"We shall do all that we can to aid her, for she bears our legacy as she bears the ancient armour and weapons of our people."

A mysterious race of avian humanoids known for their highly-advanced technology and mystical wisdom. Having colonized many worlds in their millennia of civilization, they interacted with other advanced races such as the Luminoth and the Reptilicus, and later had a role in the formation of the Galactic Federation. They adopted a young Samus into their culture, training and providing her with the iconic Power Suit. They're also responsible for leaving most of the various Power Suit modules Samus finds in her adventures, knowing that she will need them to save the galaxy from whatever threat she is fighting at the time. Unfortunately, two of the greatest threats the galaxy faced, the Metroids and Mother Brain, were also creations of theirs....


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    In General 

  • Ascending to a Higher Plane of Existence: The logbook in Metroid Prime said they did this.
  • Benevolent Precursors: While it is true that they weren't able to do much in their own lifetimes, they actively worked to put in place a system for Samus to redeem them by seeding various worlds with power suit upgrades for her to collect.
  • Beware the Nice Ones: Samus and the Metroids are proof enough that you do not want the Chozo mad at you.
  • Bird People: The Chozo are very definitely Bird People judging from their relics, the mangas, and the Chozo Memories from Samus Returns.
  • Canon Immigrant: Old Bird, one of Samus's Chozo mentors/adoptive parents, appears in the Japanese version only endings of Metroid Fusion (which you can thankfully unlock in any version of Zero Mission), and makes a blink-and-you'll-miss-it cameo appearance in Metroid Zero Mission in one of Samus's flashbacks. Old Bird first appeared in the Nintendo Power Super Metroid comic and was later imported to the manga (along with Chairman Keaton and Chief Hardy). Some speculate that the second Chozo in the engraving at the end of the game may be Aran's other Chozo mentor, Gray Voice.
  • Doom Magnet: Whatever they touch, be it planet, species, or individual, is universally ill-fated in some way. Planetary destruction and being driven to the brink of extinction happen a lot where they've been. With all the goodies they left behind, it's mostly because their leavings attract Space Pirates.
  • Early Installment Weirdness: Comics and manga made around the time of Super Metroid portrayed them as Exposed Extraterrestrials much like their statues. It later turned out that the statues were heavily stylized depictions of them; living Chozo shown in flashbacks and later manga were fully clothed in either fancy robes or Power Suits.
  • Endangered Species: In the manga, it is implied that the only remaining Chozo are the handful on Zebes and they are basically trying to finish their work on "Metroid" before they go extinct. The games are more vague but make it clear the Zebes Chozo were just one small group of a nomadic civilization, that may be endangered, extinct or simply out of reach.
  • Friend to All Living Things: The only creatures they ever had to take action against were the X. Every other species was fine to them, as shown by the wildlife on Zebes and Tallon IV.
  • Gone Horribly Wrong: Both the Metroids and Mother Brain were created by the Chozo to make SR388 and Zebes nicer places to live. In both cases, the Chozo got a lot more than they bargained for.
  • Idiot Ball: This is what the manga says brought down their civilization. When their technology had advanced to the point they could live for hundreds to thousands of years with near perfect health, they started to really get caught up in their own desires (at this point, they were still warriors), but despite the fact they could live long, they started feeling the effects of old age and had to give that up. It was only then that they realized that their entire civilization had squandered their youth and forgot to reproduce while it was possible. As a result, they became the peaceful scientists who helped form the Galactic Federation as a measure of immortality for their species as they started a near millenia of watching their own civilization die.
  • Immortal Procreation Clause: Due to their great longevity, old age wreaked havoc on their ability to reproduce, causing a steep decline in their numbers.
  • Maybe Magic, Maybe Mundane: Their interactions with the Reptilicans of Bryyo proves they had enough knowledge of magic to forewarn against the conflict between magic and technology. After the Chozo's disappearance much of their technology is succesfully reverse-engineered by the Space Pirates and the Federation, but certain Chozo designs leave them completely stumped. The Federation's attempts to replicate Samus's power suit resulted in gigantic unwieldy mech suits, and the Space Pirates morph ball prototypes wound up horribly maiming their test subjects. Whether Samus's suit has magical aspects or simply technology far beyond the current level is left open to interpretation.
  • Mistaken for Granite: The first Chozo Statue in Super Metroid seems inanimate until you take the powerup it holds and try to leave, at which point the exit seals and it attacks you.
  • Neglectful Precursors: Zigzagged. Not even they, with all their technical and spiritual skill, have what it takes to take care of the doom that follows them around like a puppy they fed, leaving it all for Samus to clean up. On the other hand, they have limited ability to make prophecies, and make a point of preparing for each one they find feasible. The Tallon IV colony stocked up their ruins with power suit upgrades specifically to help Samus save the day in the future, and it's implied that the Chozo on other worlds did the same.
  • Organic Technology: One possible explanation for the X parasites being able to duplicate Samus's suit and one of their statues, as well as how the Elysians were corrupted by Phazon. In addition, one of their Torizo had its life-energy drained and turned into a brittle husk by the enlarged Baby Metroid. Whether or not that's really the case, it's interesting that their solution to the X Parasite was to create an X-immune life form which could hunt it, rather than some non biological method of containment.
  • Perfect Pacifist People:
    • The Chozo have evolved to a point in which they live in harmony with nature, shunning violence and destructive technology. Of course, they were warriors once, and were able to create the advanced armor that Samus uses.
    • Taken Up to Eleven in the manga, where the present Chozo race has a mental block against violence — harming sentient beings for any purpose causes a Chozo to experience immense pain or even death. Training Samus to do it is fine, though.
    • Subverted in the secret Chozo Memories ending in Samus Returns. While it's very vague about what happened, it's clear that at least one Chozo is not above killing its own peers.
  • Precursors: They seem to zigzag all the precursors tropes. Their neglectfulness is mentioned below, their Abusive Precursors status is established by the fact they made the Metroids, then subverted into Benevolent Precursors both by the below mentioned upgrades, and the fact they originally made the Metroids to stop something worse.
  • Proud Warrior Race Guy: What they used to be. Prime shows they consider Samus's weapons to be ancient, but whether that has to do with being primitive to them at this point or simply because no one's bothered to choose the warrior's path for so long is up for debate. The secret Chozo memory in Samus Returns reveals that some of them chose to stay this way, even going up against their own kind, and this faction may still be alive.
  • Psychic Powers: Of the subtle variety.
  • Space Elves: In their warrior phase they were essentially Space Tengu.
  • Steam Punk: They have done some dabbling in this, as seen by the observatory they left on Elysia.
  • Sufficiently Advanced Aliens: A major reason why Samus's suit has such impossibly advanced technology is because these guys didn't have to worry much about regular physics.
  • Technical Pacifist: Chozo themselves are incapable of harming other lifeforms. There are no such restrictions on them creating things to do the violence for them. Just ask Samus, the Metroids, and any of their defense systems.
  • Wide-Eyed Idealist: They tried many times to get the Galactic Federation to demilitarize and become a more peaceful civilization, but their points were always ignored because of threats like the Space Pirates looming. The Chozo themselves had no real alternative to this, other than Samus.

Individual Chozo

     Old Bird
Debut: Super Metroid (comic)

One of the Chozo who served as an adoptive parent to Samus after she was orphaned, and also trained her.

  • All-Loving Hero: He believes all conflict can be ended by understanding the other side and reaching a mutual agreement, though he's not completely naïve and acknowledges that violence can't be ended soon.
  • All There in the Manual: His characterization is limited to the canon manga.
  • But Now I Must Go: Inverted. Once Samus' physical training is complete, he tells her that the mental training she needs can only be achieved through her own efforts and that she must walk her own path.
  • Canon Immigrant: He was introduced in a Super Metroid comic and given an extensive role in the Metroid prequel manga before he made his debut in the games themselves with Zero Mission.
  • Fat and Skinny: He's noticeably more bulky than Gray Voice.
  • Friend to All Children: He has a soft spot for children of all species, stemming from his own inability to have children. He's even willing to leave negotiations to Gray Voice to go play with a child.
  • Heterosexual Life-Partners: With Gray Voice. Though they did raise a child together...
  • In the Hood: He first appears wearing robes and a hood.
  • Killed Offscreen: He's presumed dead in the fall of Zebes.
  • Old Master: Of the spiritual variety. He teaches Samus meditation, philosophy, and various sciences.
  • Older Than They Look: His name includes the word old, but you were probably thinking something around a century. He's been alive much longer than that.
  • Parental Substitute: To Samus.
  • Unwitting Instigator of Doom: Ridley was trailing him when he visited K-2L for fuel, which led to its destruction.
  • Well-Intentioned Extremist: He's the one who ordered the creation of the metroids.

     Gray Voice
"Old Bird!! What do you plan to do by bringing a human child here?"
Debut: Metroid (Manga), Metroid Fusion (Japanese version-only ending)

The other Chozo to serve as Samus' adoptive parent. He was also the one who infused Samus with his own Chozo DNA.

  • All There in the Manual: Like Old Bird, he only appears in still images in the games. You have to read the canon manga to know about him as a person.
  • Armchair Military: His mental blocks prevent him from fighting himself, but his experience and intelligence make him an excellent tactician.
  • The Atoner: He tries to kill Mother Brain to prevent the Chozo's defective creation from endangering anyone else.
  • Break Out the Museum Piece: He uses a centuries old Chozo battle suit to take on Ridley.
  • Co-Dragons: With Ridley after his Face–Heel Turn.
  • Demoted to Dragon: After his Face–Heel Turn he becomes Mother Brain's head tactician.
  • Dying Moment of Awesome: He shoots down the pirates pursuing Samus just before Ridley finishes him off.
  • Dynamic Entry: He blasts his way into Mother Brain's chamber when he tries to kill her.
  • Face Death with Dignity: He spends his last moments calmly reflecting on his adopted daughter.
  • Face–Heel Turn: When Zebes falls to the space pirates, he betrays the Chozo and joins them.
  • Fake Defector: He was just waiting for the right moment to eliminate Mother Brain and Ridley. He helped sell the ruse by allowing Ridley to kill the other Chozo, who had already agreed to it.
  • Fantastic Racism: He considers Space Pirates, and Ridley specifically, to be nothing but animals with the barest veneer of sentience.
  • Fat and Skinny: He's head and shoulders taller than Old Bird and thin as a rail.
  • Foregone Conclusion: Since Mother Brain and Ridley both show up in the games, his attempted assassination was doomed to failure.
  • Heroic Willpower: All Chozo had mental blocks that caused excruciating pain if they attempted to commit violence. He pushes through it to fight Ridley.
  • Heterosexual Life-Partners: With Old Bird.
  • Impaled with Extreme Prejudice: He's impaled by Ridley's barbed tail.
  • In the Hood: The same example as Old Bird, though he pulls it off better.
  • Kill It with Fire: How Ridley ultimately kills him.
  • Made of Iron: He survives being impaled long enough to escape and help Samus.
  • Old Master: While Old Bird handled the mental aspects, Gray Voice taught Samus combat and tactics.
  • Older Than They Look: Centuries old, if he hasn't hit at least a millennia.
  • Parental Substitute: To Samus. Perhaps more than Old Bird, as he was the one to donate DNA for her genetic modification.
  • "The Reason You Suck" Speech: He really likes these, even if the subject isn't around to here them. The Federation, Samus, Ridley, Mother Brain, very few escape his criticism.
  • The Spock: He is far less emotional than Old Bird.
  • Social Darwinist: He accepts that Mother Brain made the Chozo mentally obsolete, and joins her in controlling the space pirates to replace them.
  • Unwitting Instigator of Doom: He was one of the key figures in the creation of the metroids.
  • Well-Intentioned Extremist: He's willing to exterminate a race of peaceful space butterflies to halt the spread of a deadly plant.

Chozo Groups

    Zebes Chozo 
Debut: Metroid 1 (statues only), Metroid: Zero Mission (first onscreen appearance)

The Chozo colonists who inhabited Zebes, built Mother Brain, and eventually raised Samus Aran.

    SR-388 Chozo 
Debut: Metroid II: Return of Samus (statues only), Metroid: Samus Returns (first onscreen appearance)

The Chozo who colonized SR-388. Upon discovering the X Parasites and realizing the threat the organisms posed, they decided to create the Metroids as the ultimate predator.

  • Applied Phlebotinum: Some of their technology is powered by "Aeion", the yellowish planetary energy of SR-388.
  • Build Like an Egyptian: Their ancient buildings in Samus Returns feature quite a few pyramids.
  • Cavalry Betrayal: After having to combat and seal away the Metroids they created, they were forced to send a distress signal to escape the planet. They were then killed by an apparent rogue faction of Chozo.
  • Godzilla Threshold: Most Chozo have been portrayed in a Friend to All Living Things manner. The fact that they nonetheless created the vicious Metroids to eat the X Parasites shows just how frightened they were of the threat the latter posed to the galaxy.

    Tallon IV Chozo 

The Chozo who colonized Tallon IV and abandoned most of their technology to live in harmony with nature.

  • A Fate Worse Than Death: They were pulled from their Higher Plane of Existence by Phazon. They managed to deal with it and return, except for the many that were twisted into insane ghosts by it while sealing the bulk of the stuff away. They had to be left behind. They are the turned.
  • Ascend to a Higher Plane of Existence: It's stated in Metroid Prime that at least some of them have done this. The Phazon pulled them back down, though.
  • Our Ghosts Are Different: Some left their bodies and the game's dimension behind; later, they returned to the game's dimension, still without those bodies. The ones that got stuck in the game's dimension because of Phazon madness are what the other creatures call ghosts. The Chozo call them the turned.
  • Seers: Those on Tallon IV had visions of the future, but they were not perfect visions.
  • Space Amish: More so than the other Chozo colonies, they ditched their advanced technology to live in harmony with nature. Granted, there do seem to be quite a few advanced bits of technology around their ruins, though it's ambiguous how much of it is theirs and how much was introduced later by the Space Pirates.
  • We Have Become Complacent: The Tallon IV colony had decided to give up all but the most basic technology and live in harmony with nature. This unfortunately made dealing with invaders and star born plagues more difficult but they did discover some new tricks, such as prophecy and managed to MacGyver enough things till Samus came, like their visions foretold. Still, some of the machines found on Tallon IV are mere first and second generation equivalent drones, from a society with multiple millennia of continuity.

    Chozo Ghosts

The spirits of dead Chozo from Tallon IV, twisted into abominations by Phazon.

  • Abusive Precursors: Due to Phazon exposure. It has a much greater effect on entities without physical forms.
  • A Fate Worse Than Death: They had their higher plane status revoked before being corrupted.
  • Came Back Wrong: They ascended to a higher plane but became monstrous parodies of their former selves.
  • Face–Heel Turn: They're even called the Turned.
  • Heel–Face Turn: After Samus collects all 12 Chozo Artifacts, they manage to regain their free will long enough to repair the portal into the Impact Crater.
  • Intangible Man: Not that they need it.
  • Invisibility: They're fond of appearing just long enough to shoot you before vanishing from sight.
  • Kill the Lights: A tell that they are around is a dimming of lights.
  • Mercy Kill: Even the Chozo thought they would be better off dead.
  • No-Sell: Every fancy weapon you collected throughout the game? Useless.
  • Our Ghosts Are Different: Energy beings whose minds have been subsumed by the Phazon.
  • Religious Bruiser: They tend to congregate around areas most sanctified by the Tallon IV colony
  • Screaming Warrior: Presumably in agony, but they shriek a lot.

    Elysia Chozo 

Chozo colonists who built the floating settlement of SkyTown in the atmosphere of Elysia as a base to observe and research deep space. They built the Elysians to help them maintain the facilities and eventually left SkyTown entirely in the hands of the intelligent machines.

  • The Smurfette Principle: The Chozo Searcher mentioned in Elysian scan data is to date the only female Chozo in Metroid lore (unless you want to count Samus due to her Chozo DNA Bio-Augmentation).

Chozo Technology

     Torizo Statues

Debut: Super Metroid
"The statues are our sentinels: blind but ever watchful, they are and have always been, repositories for our most precious secrets and strongest powers. The crafting of each is a long and sacred process, performed only by those Chozo who have lifetimes of experience in such things. We have left these relics on planets across the solar system. Some are merely reminders: silent emblems of the Chozo that serve as icons of peace in lands that know only war. Others wield subtle strength, exerting their influence in ways beyond the understanding of mortal creatures. Still others are guardians of our secret ways, and these can be as terrible as they are beautiful. Those who respect and honor these relics will know the friendship of the Chozo. Those who deface or destroy them will know our wrath, unfettered and raw."
Tallon IV, Hieroglyphic Engravings

Statues created by the Chozo that are potent defense systems or attack golems. At first, they appear indistinguishable from the benefactor Chozo Statues that hold Samus's upgrades, but then they surprise her by coming to life and attacking her.

  • Bullet Catch: The Golden Torizo will grab super missiles out of the air and throw them back at Samus. Fortunately it can only grab them one at a time, making super missile spamming a viable option.
  • Cranial Processing Unit: Averted. The first Torizo boss in Super Metroid continues fighting after its head is destroyed.
  • Dodge the Bullet: Golden Torizo, again. It's almost impossible to hit with normal missiles.
  • Dub Name Change: Torizo are simply known as Chozo Statues in Japanese. Giving them a distinctly different name is an addition made by the English localization.
  • Eye Beams: The Golden Torizo can shoot energy rings from its eyes. When it blinks, the rings explode where they hit the ground.
  • Golem: Maybe? They certainly look like stone, but they could just be stylized robots. Plus they were susceptible to Metroid predation and X infection, which could only affect organic material.
  • Grenade Spam: Both Torizo statues can launch a large number of item spheres from their beaks. Rather than providing new upgrades, these promptly explode upon hitting the ground.
  • Inescapable Ambush: The doors lock when they attack.
  • Law of Chromatic Superiority: The most powerful Torizo is gold, while the others are grey or brown.
  • Living Statue: They look just like ordinary Chozo Statues, but then they come to life and combat Samus.
  • Mistaken for Granite: The combat Torizo are identical to the ones that harmlessly hold upgrades. That quickly changes one they activate.
  • The Unfought: There is a third Torizo in Super Metroid, located in Tourian. It's already been drained by the Metroid Hatchling by the time Samus arrives, and is Reduced to Dust with the slightest touch.
  • Weaponized Offspring: As a last-ditch attack, the Golden Torizo releases eggs, which promptly hatch into mechanical chicks that attack Samus.

     Hive Mecha
Debut: Metroid Prime
"A design flaw makes the shielding on Hive Mecha weak around their access ports. These units are second-generation combat drones, able to interface with organic units at a higher level. They train, shelter, and work with hive dwelling predators. Unarmed, they rely on their hive beasts to handle any threats."
Scan Data

A combat drone created by the Chozo to protect the ruins of Tallon IV. Nurtures a nest of vicious Ram War Wasps within it. Fought in the Hive Totem.

  • Attack Drone: Unlike your typical drone though, it's stationary. The War Wasps actually act more drone-like than it.
  • Attack Its Weak Point: It can be damaged by firing at the hatches that release the War Wasps, once they're open.
  • Bee Bee Gun: The Chozo made this machine to weaponize War Wasps.
  • Flunky Boss: It's sole attack is to release the Ram War Wasps that live inside it.
    Scan Data: Unarmed, they rely on their hive beasts to handle any threats.
  • Pest Controller: It controls the War Wasps by emitting signals for them to attack.

     Incinerator Drone
Debut: Metroid Prime
"Device schematics indicate a high risk of malfunction when internal power core is damaged. Unit has minimal combat programming, but can defend itself if necessary. This drone's intense heat blasts compensate for its lack of battle prowess."
Scan Data

Another combat drone created by the Chozo. Fought in the Burn Dome of the Chozo Ruins.

  • Attack Drone: And just like the Hive Mecha, it is stationary as well.
  • Attack Its Weak Point: It has a core. You know what to do.
  • Fire-Breathing Weapon: It's a robotic flamethrower primarily used for garbage disposal, but it also functions as a defense mechanism.
  • Flunky Boss: Accidental example. If its core is shot enough times, its firing mechanism will malfunction and burn the hive of Barbed War Wasps right above it, pissing them off.
  • Mundane Made Awesome: It's a glorified trash burner that doesn't even look that advanced by Chozo standards, yet it's treated as seriously as any other boss, receiving epic boss music and everything.

     Ruins Test

Found deep within the Chozo Ruins of Chozodia, the Ruins Test appears to be a large and impressive mural decorated with hieroglyphics depicting the God of War. During Samus's Zero Mission, the Ruins Test comes to life and the God of War manifests as a ghostly entity that tests Samus's will and proves that she is worthy of the Fully Powered Suit.

  • All There in the Manual: Its only official English name, the Ruins Test, is derived from the Nintendo Power guidebook.
  • Attack Its Weak Point: The God of War is holding a glowing orb, which is its only vulnerable spot. When the orb displays a Power Suit symbol instead of her reflection, Samus must shoot the orb. She must do this four times in order to pass the Ruins Test.
  • Dark Is Not Evil: The room turns dark while the Ruins Test is active, its battle theme is an Ominous Pipe Organ, and its subject is a War God. However, it is simply a test that proves Samus's willpower, restores her lost Power Suit, and rewards her with the most powerful items in the game.
  • Kill the Lights: When the Ruins Test projects itself as a ghostly entity, the room turns much darker, even though there is no apparent light source to extinguish. Once the test is passed, the lights come back on.
  • Our Ghosts Are Different: The God of War appears as a ghost or spirit when it emerges from the mural, although its exact nature is uncertain.
  • Shock and Awe: It attacks by casting lightning bolts upon the ground.
  • Stop Hitting Yourself: The Ruins Test's orb usually shows Samus's reflection. If Samus shoots the orb during this time, she hurts herself.
  • Threshold Guardians: The Ruins Test is meant to test one's resolve and will. By overcoming it, Samus proves that she is worthy of the legendary Fully Powered Suit.
  • Tron Lines: Whenever the Ruins Test is about to use its lightning attack, the outlines of the God of War's mural glow with a bright neon blue light.
  • Turns Red: As the battle progresses, the Ruins Test speeds up, and its lightning attacks begin producing shockwaves that travel along the floor and walls.
  • War God: It is referred to as the God of War in Japanese sources, including an interview with Yoshio Sakamoto on the Zero Mission website.


A race of robots built by the Chozo to help maintain the SkyTown facility and eventually given self-awareness. When the Chozo left Elysia, they left their mechanical progeny in charge. The Elysians continued their creators' task of researching the cosmos until a shortage of fuel and supplies required them to enter a centuries-long hibernation. The Galactic Federation eventually woke them up and negotiated a treaty where the Elysians would be given supplies in exchange for sharing their research data. Unfortunately, the impact of the Leviathan would result in the Elysians being driven mad by Phazon.

  • Benevolent A.I.: They were utterly devoted to their Chozo creators and got along well with the Federation as well. Only being unwillingly corrupted by Phazon was able to turn them evil.
  • Book-Ends: The first line of the first Elysian lore and the last line of the last Elysian lore are: "I am Elysian, descendant of both the Chozo and the First. I am facing the last moments of my life and transferring my memory to the data pod."
  • Brainwashed and Crazy: Phazon corruption really did a number on them, a problem only worsened by the liberties Ghor took with hacking them after he arrived in Skytown.
  • Do Androids Dream?: Elysians installed the ability to "dream" in themselves so that they could be alerted to happenings while they "hibernated". They claim to have seen forms of their builders in between their operational sessions, but given the Talon IV Colony's established abilities, there may have been more to that incident than what the installed dreams were supposed to cover.
  • Let's You and Him Fight: The Elysians nearly got into a fight with the first Federation expedition due to the latter being heavily armed when they landed. Fortunately, the Federation was quickly able to clear up the misunderstanding.
  • Uncertain Doom: It's not clear if the various mechanisms encountered throughout the game are the intelligent Elysians referred to by scans or lesser robots they created. If it's the latter, the true Elysians may well have been completely destroyed by the corruption. If it's the former, there's still some hope they can recover.


Elysians with potent repair and combat capabilities, reduced to little more than drones by Phazon corruption and Ghor's hacking.

  • Badass Cape: Powerful robots who wear capes, though it's best not to question where they got the cloth.
  • Combat Medic: They can repair the other robots of Skytown, even those blasted into inactivity, making it impossible to clear out certain rooms without killing them first.
  • Flight: Typically they just hover, but dropping a bridge out from under one just causes them to fly away rather than fall to their death.
  • Flunky Boss: They always appear with a few steamboat minions, which they revive whenever they die.
  • Invisibility: The only time they're visible is when they're attacking or reviving one of their lackeys. The x-ray visor can see them despite the cloaking.
  • It Can Think: Scans of vaporwings and steamspiders reveal that they were creations of the steamlords. Whether they were the intelligent Elysians referred to in the scan lore or simply particularly intelligent drones with a degree of freedom is up in the air.
  • Lean and Mean: They're thinner than just about every other enemy in the game, being little more than mechanical bones.
  • Mini-Boss: They're of a smaller scale than all the other bosses in the game, including the other minibosses.
  • No-Sell: After Samus acquires the plasma beam, her beam shots will melt the steambots beyond repair, preventing the steamlord from reviving them.
  • Power Floats: The most powerful beings encountered on Elysia, barring the other bosses, and they constantly float above the ground.
  • Recurring Boss: Four steamlords are encountered through the game.
  • Shock and Awe: They attack Samus and revive steambots with arcs of lightning.
  • Skull for a Head: A holographic one, but still. Closer examination reveals it to actually be a depiction of Ghor's head, though given that his head is still quite skull-like, the principle remains.

    Defense Drone

A powerful combat robot defending the boost ball upgrade on Elysia.

  • Armless Biped: Its general design, though it does have a cannon limb situated in the middle of its upper body.
  • Attack Its Weakpoint: Its control module, which must be exposed by shooting its sensory antennae and grappling open its outer casing.
  • Cyber Cyclops: A large robot with one eye.
  • Homing Projectile: The plasma bomb, which can make hairpin turns. The mines it fires when its core is exposed also home in after a few bounces.
  • Macross Missile Massacre: It can fire many missiles in a rapid salvo.
  • Ominous Fog: Once its health drops low enough, it vents obscuring fog when its control core is exposed.
  • Shockwave Stomp: It can hop into the air and land in an electrical shockwave.


A powerful Elysian robot chosen as the guardian of the Elysia Leviathan.

  • A.I. Is a Crapshoot: Not of his own programming. He has been corrupted by Phazon.
  • Ambiguous Gender: One would assume he would have none at all, being a robot, but the scan visor says that Helios is male.
  • Beam Spam: One of the shapes it may take with its swarm is diving them up into rings of six, and having each ring fire a powerful beam at you.
  • Chainsaw Good: Though Helios primarily relies on his Swarmbots for attack and defense, he is not completely defenseless on his own.
  • Deadly Disc: One of the shapes he may take with his Swarmbots.
  • Dual Wielding: Wielding dual chainsaws two years before Madworld.
  • Hive Mind: It controls thousands of Swarmbots through wireless communication.
  • Killer Robot: Helios's original function, much like the swarm bots, is unknown but Phazon has turned them into killers.
  • Meaningful Name: The Swarmbots all revolve around Helios, both figuratively and literally in many cases.
  • Multiarmed And Dangerous: The robot has four arms.
  • Rolling Attack: Another of his forms.
  • Spin Attack: One form he may take is to lay himself on the ground and have his swarmbots form a tornado-like swirling shape above it, and proceed to slide across the ground.
  • Synchronized Swarming: He uses five formations in particular.
  • The Worm That Walks: One shape it takes is to have the Swarmbots form into four limbs for a vaguely human-like appearance.


A completely new boss introduced in Samus Returns, not being present in the original Metroid II. A Chozo robot used for mining operations in SR388, it went rogue at some point after the Chozo vanished from the planet.

  • Advancing Wall of Doom: It forms one of these with its drills to use in a chase scene. it later uses a variation of the tactic during its boss fight.
  • A.I. Is a Crapshoot: Even after the Chozo left the planet, it's still functional and digging through SR388. It also attacks any intruders it comes upon, despite being just a mining robot.
  • Almighty Janitor: It is a mining robot, which is also a surprisingly competent killer for a machine with a relatively mundane design purpose and happens to be one of the toughest bosses in Samus Returns.
  • Ambiguous Situation: It's not clear if Diggernaut is attacking Samus because it has gone haywire or if its regular security protocols have Gone Horribly Right in targeting intruders. Even the official Prima Guide brings up this ambiguity.
  • Background Boss: For much of the fight it stands in the background where Samus can't reach it while swinging its drill arms at her.
  • Call-Back: Its drill arms and head have markings resembling the Spider Ball tracks in the Metroid Prime Trilogy, indicating that Samus can use the Spider ball to climb onto those surfaces.
  • Cyber Cyclops: It has a single red eye.
  • Frickin' Laser Beams: It can fire those from its giant, mechanical eye.
  • The Juggernaut: Fitting for his name, it persistently tries to kill Samus during a section of the game. It's also a Marathon Boss to boot.
  • Killer Robot: It's very deliberately trying to kill Samus despite being designed as a mining robot. Once it believes that she died after their Area 4 encounter, it quickly leaves.
  • King Mook: Subverted. Diggernaut is a much larger version of the mining robots seen throughout Area 3. However, only Diggernaut becomes hostile to Samus and the lesser mining robots remain harmless set pieces.
  • Not Quite Dead: After defeating it in the boss fight, it tries to get up for another round.
  • Offhand Backhand: After the boss fight Samus blows its head into pieces without even looking at it as she goes to collect her upgrade.
  • Red Eyes, Take Warning: Obviously, this giant, murderous robot boss can't have anything else but a single, glowing red eye.
  • Shockwave Stomp: After Samus damages the rotative mechanism of its drills, it has to resort to this by using them as blunt weapons.
  • This Is a Drill: Both of its arms are equipped with gigantic drilling mechanisms.
  • Tripod Terror: It has three stubby legs, though it uses its arms as well to lumber along.


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