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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
"Did you finally realize you are nothing but a beast as well? ... No, more accurately — that you're just a bird that can't even fly."
Voiced by: Levi Stubbs (Captain N: The Game Master)

https://static.tvtropes.org/pmwiki/pub/images/motherbrain.png
"Defective product... Me...?!! A 'defective product'... You dare claim that I am defective...!!"
Click here to see her final form from Super Metroid. 
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The Mechanical Life Vein of Planet Zebes, progenitor of the Aurora Unit Biological Super Computer Complex, the self-proclaimed 'Mother' of the multiplied Metroid hordes and the true leader of the Zebesian Space Pirates. Once a benevolent AI system that assisted the last of the Chozo, she degenerated into rampant insanity as a result of being surpassed by their last child, leaving her legacy in the dust. Jealous and spiteful of "lesser" life-forms, Mother betrayed her caretakers and allowed the Space Pirates to invade Zebes; upon which she seized control of their armies with powerful telepathy. A deluded social darwinist, Mother seeks nothing more and nothing less than the subjugation of every living thing.


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    A — E 
  • Adaptational Badass: The Zero Mission remake of the original game beefs up Mother Brain from a vulnerable brain dependent on her elaborate defense system to a Nigh Invulnerable boss that can only be harmed when her eye is open, and said eye shoots out a laser beam whenever that happens.
  • A.I. Is a Crapshoot: Retconned in the Prime series as an organic machine built by the Chozo, instead of the Space Pirate leader. This is in the manga too. The manga reconciles these roles (she takes the pirates over).
  • Ambition Is Evil: Part of the reason why Mother Brain betrayed her Chozo creators and took over the Space Pirates is due to her advanced AI learning the concept of ambition. She wants to be the greatest legacy of the Chozo race, and becoming ruler of the universe is a stepping stone to that path.
  • Arch-Enemy: While not quite as personal as Ridley, Mother Brain is still one of the most recurring villains of the series, and earns Samus's ire in various ways, most notably killing the Super Metroid, which was the baby Samus had spared and in some sources was implied to bond with. It's somewhat more prominent in the manga, where she played a part in raising Samus, before becoming one of her adversaries.
  • Ax-Crazy: She's always been a bit unstable but after she goes One-Winged Angel in Super Metroid, Mother Brain is completely animalistic. She tries to kill Samus in the most painful manner possible and doesn't even hesitate to kill the Super Metroid for interfering, even though it's her most valuable asset for her bio-weapon program.
  • Bad Boss: Mother Brain views the Space Pirates as tools to be used and later disposed of. She even refers to them, including Ridley, as simple beasts in the manga. This attitude is hinted at in a Zero Mission cutscene where the Metroids are free and devouring every Zebesian on sight, despite statements saying that Mother Brain can control them through her brainwaves.
  • Berserk Button: Mother Brain considers herself to be the perfect successor of the Chozo race and the rightful master of the universe. So when Gray Voice calls her a "defective product," she becomes completely unnerved and later wrathful.
  • Big Bad: She is the true leader of the Space Pirates, with pirate leaders such as Ridley answering only to her. Whenever she appears, she is always the number-one threat barring none.
  • Brain in a Jar: Mother Brain is protected by a glass container that Samus needs to break with her missiles before attacking the grey matter within. However, Mother Brain doesn't need the glass jar to survive as Super Metroid reveals in the final fight.
  • Brain Monster: She's a massive brain in a tank.
  • Breath Weapon: Her jaws in her One-Winged Angel form doesn't just spews out foul breath; it also spews out rings of energy as well as cluster bombs.
  • Cores-and-Turrets Boss:
    • Destroy the Zebetite barriers, avoid the turret shots and rinkas. Break the glass then shoot the brain. Also, watch out for the occasional pit of freakin' lava (acid in Super Metroid).
    • Zero Mission adds the additional defense of an eye lid, which will deflect your attacks while it charges her eye beams. Unfortunately for her, she has to release the charge eventually, leaving her eye vulnerable in the cool down period.
  • Cyclops: Not originally though. Zero Mission makes her a cyclops from the start through retroactive continuity.
  • Dark Action Girl: She may be a giant brain, but that doesn't mean she can't put up a fierce fight. She is also one of the few antagonists to nearly kill Samus with a Curb-Stomp Battle.
  • Dark Lord on Life Support: Extreme inversion: Mother Brain is a giant brain in a highly impact-resistant glass casing. After breaking through the shield, you still have to fire multiple missiles (regular beams do nothing) directly at her bare grey matter in order to finish her off, proving that the transparent casing is clearly for protective reasons only.
  • Death by Irony: When she is finally destroyed in Super Metroid, she is reduced into a sepia-colored husk of a brain before crumbling away into dust, a fate that would have befell upon her enemies had her Metroid bio-weapon project gone off without a hitch.
  • Despotism Justifies the Means: Mother Brain's idea of a prosperous and orderly universe is for her to rule over every living species in existence. She hates the notion that the races of the Galactic Federation would create a new era of peace without her, and doesn't care if her methods would turn them into "mindless beasts" as Samus puts it in the manga. Her endgame is to become the ruler of the universe.
  • Early Installment Weirdness: In the first game she had two eyes, a nose, tusks, and did not attack directly. In Super Metroid, she only had one eye and was more active. The first game's remake retconned Mother Brain to have only one eye and to actively defend herself.
  • Evil Cannot Comprehend Good: This is how Gray Voice was able to get as far as he did to kill Mother Brain in the manga. Mother was so convinced by Gray Voice's decision to side with her vision that she didn't foresee his true allegiance and was genuinely shocked when he betrayed her. Likewise, she could not accept a universe where she does not rule or Samus being the Chozo's true successor rather than her.
  • Evil Counterpart: Like Samus, she's heavily associated with maternal themes, and in the manga was also created by the Chozo to be their ultimate creation of sorts, mirroring Samus's own upbringing as a great warrior. Yet while Samus is a Friend to All Living Things and would rebel against her superiors to do what's right, Mother Brain subjugates all life within her reach and had revolted against her masters to rule uncontested.
  • Evil Is Petty: In the manga, she once framed the Iono Feria as carriers of the badger clovers, a poisonous plant, and then burned them to death just to spite Samus for being one of the Chozo's "children."
  • Evil Laugh: After Ridley critically wounds the rebellious Gray Voice, Mother Brain laughs at the dying Chozo for failing to stop her. This haughty laughter marks the moment that Mother drops her Well-Intentioned Extremist facade and embraces her power-hungry malevolence that has always been boiling inside of her gray matter.
  • Evil Matriarch: In the manga, she, along with the Chozo, raised Samus on Zebes in her childhood years. But when she took over Space Pirates, Mother Brain wants Samus to join their ranks, and tries to break her by claiming that she was always meant to be raised as a weapon from the very beginning. When that doesn't work, Mother Brain allows Ridley to attack the traumatized Samus. This ends up doing more damage than Mother Brain intends however, though Mother's reaction amounts to nothing more than being slightly disappointed. This seems to have been retconned out of the games. Samus suggest at the beginning of Metroid Zero Mission that she had been living in Zebes before Mother Brain came and ruined everything.
  • Evil Old Folks: She was designed to invoke the image of a withered, evil old crone, to the point of having a scrawny (mechanical) body and drooling mouth in Super Metroid. Her actual age is unknown, however, but we can presume she's been around for a while. Well, Metroid Zero Mission implies Samus lived on Zebes before Mother Brain arrived but that doesn't necessarily mean Mother Brain hadn't been around for awhile before being setup in Torain.
  • Eye Beams:
    • She is the only boss from the first game to be made more difficult in Zero Mission. She doesn't shoot them normally though, being in a jar and all.
    • The Laser Brain Attack in Super Metroid is among the most visually devastating attacks in the franchise, able to strain Samus to the point of exhaustion, drain multiple energy tanks off her, and destroy her entire stock of missiles and bombs with just one charge.

    F — L 
  • Face–Heel Turn: She used to be a benevolent computer indispensable for the Chozo culture but her advanced standalone AI allowed her to think further than the Chozo anticipated, spouting dangerous thoughts such as domination and pride. She went berserk and betrayed her creators to the Space Pirates, whom she eventually took over as their leader.
  • Fangs Are Evil: She has a nice set of sharp teeth to show off in her One-Winged Angel form.
  • Fantastic Racism: Mother Brain regards all living species to be inferior to her but she reserves the worst of this attitude for the Chozo, her creators. Mother mocks the Chozo as an aging and obsolete race doomed to extinction, no longer needed to preserve their own culture and teachings because she stored them all in her databanks. The Space Pirates do not fare any better, as Mother considers them to be a weak-willed subservient race destined to serve her every whim.
  • Faux Affably Evil: In the manga, she seems to be benevolent, well-intentioned and almost motherly to Samus and the Chozo, even when she has taken over the Space Pirates to conquer the galaxy. But when Gray Voice betrays her and then points out that her agenda is evil and self-centered, the enraged Mother Brain inadvertently admits that she sees all lifeforms as inferior and is in fact jealous of Samus for being everything she is not. After being saved by Ridley, Mother embraces her newfound malevolence and goes full tyrant in her crusade, dropping any pretense of well-intentioned goals.
  • Final Boss: Of the first game (but not the remake), as well as Super Metroid.
  • Final Solution: After concluding that the Chozo have become a "defective" and dying race, Mother decides to speed up the process by taking over the Space Pirates and using them to the kill off the remaining Chozo on Zebes.
  • Frickin' Laser Beams: Her general means of attack in all the games she's appeared. Her most iconic and devastating one is the Laser Brain Attack.
  • Galactic Conqueror: What she aspires to be. Using the Space Pirates as her main army and the Metroids as her special bio-weapons, she would have easily accomplish that goal if it weren't for that one lone bounty hunter named Samus.
  • A God Am I: She believes her destiny is to become "the true master of the universe" and recreate the universe in her own image. This is not helped by the fact the Chozo had become very dependent on Mother Brain to handle their culture, knowledge, technology, security and agenda, which fueled her dangerous ego.
  • Go for the Eye: In the Zero Mission remake, Mother Brain can only be damaged if her one eye is open. Said-eye only opens when it launches a beam attack, so prepare to jump and fire.
  • Green-Eyed Monster: Mother Brain envies other sentient lifeforms for having the Chozo's favor despite the fact that the Chozo themselves are highly dependent on her. She sees them all as threats to her claim as the Chozo's successor, especially Samus Aran.
  • Hive Queen: Mother Brain is said to have direct control over the Space Pirates and Zebes' wildlife with her psychic mind, but it seems to be an Informed Ability in the games. Though if M.B., whose AI is based on Mother Brain's, is anything to go by, she has the capacity to (and likely did) control her minions in that manner.
  • Hoist by His Own Petard: Mother Brain uses the Baby Metroid to clone vast armies of Metroids for her galactic conquest. The same Metroid ends up draining her energy and then transfers it to Samus, who puts a permanent end to the pirate leader. Even more ironic is that, according to the manga, Mother Brain secretly raised Samus as a bioweapon to enforce her new order; double karma in one.
  • Inferiority Superiority Complex: Despite the fact that the Chozo have grown more reliant on her as their race begins to die out, Mother Brain fears that they do not see her as their successor and would instead give everything they have to other sentient life, like Samus. To correct this perceived error, Mother begins tout herself as a creation who has long surpassed her creators, that they were defective and must go, and that she alone can bring order to the universe by subjugating all life to her will.
  • Informed Ability: The psychic powers she is said to have in the manga are rarely, if it all, made use of in the games. The events of Zero Mission are the strongest evidence against them, as the Zebesians in her lair still fail to control the Metroids, which can be contrasted with Metroid Prime 3, where Dark Samus does prove capable of getting Metroids to temporarily work along side other creatures against Samus. Also, Other M's suggestion that the Zebesians would fall apart without her is contradicted by the manga, where they were pirating before she came around (though Mother Brain did state that the Zebesians were a weak subordinate race in need of a strong master), and the prior games, where they stayed together after she, Ridley and Kraid where all blown up by Samus.
  • In Their Own Image: Once she eliminates the Galactic Federation as well as the Space Pirates through collateral damage, she intends to pick up the survivors and remake them into whatever she deems fit for her idea of "perfection."
  • It's All About Me: Although she proclaims that her agenda is to bring a new era of prosperity for the universe, it becomes clear in the manga that her goals are self-centered. She plans to wipe out the Chozo on Zebes because she believes herself to be the embodiment of Chozo culture, thus rendering them obsolete. When Gray Voice confronts her, he proclaims that Mother is in fact jealous of living species because they could potentially supplant her as builders of a new era, and that she is most afraid of Samus being the Chozo's real legacy rather than her.
  • Karmic Death: After plotting to conquer the galaxy with an army of Metroids, Mother Brain nearly got her entire life-force drained by the Super Metroid. She survives the attempt, only to meet death at the hands of Samus, the human whom Mother Brain emotionally abused as a means to turn her into a bioweapon.
  • Kick the Dog: Several times, and usually towards Samus.
    • In the manga, she wipes out an entire population of Iono Feria right after Samus non-lethally disarms them, justifying it as standard protocol. In truth, she just wants to spite Samus.
    • Later on, to break Samus, Mother Brain tells her that she is always meant to be a bioweapon instead of a person and that she must work with her hated foes, the Space Pirates, to bring a new order to the galaxy. And then Mother summons Ridley when Samus rejects her.
    • And of course, she kills the Baby Metroid right in front of Samus at the climax of Super Metroid. She immediately regrets it.
  • Killed Off for Real: After recovering from her first "death" against Samus in Metroid/Zero Mission and going through two Not Quite Dead moments in their second battle, Mother Brain is finally killed off in Super Metroid via Samus's newly acquired Hyper Beam. Her brain disintegrates into dust, and then the whole planet of Zebes explodes to erase any doubt of her demise. While her AI schematics lives on in Galactic Federation creations like M.B., the Chozo creation is good as dead.
  • Knight Templar: She intends to continue the Chozo's efforts to bring peace and prosperity to the galaxy long after they're gone. Peace though tyranny where she will correct any defect among the lifeforms that survive her engineered catastrophic galactic conflict.
  • Lack of Empathy: In the manga, her first impression of Samus is that she as a weak creature that won't survive on Zebes for a few days. Even after Samus is infused with Chozo DNA, Mother Brain only sees her as just a useful bioweapon to conquer the galaxy. This lack of empathy extends to all living beings.
  • Large Ham: In the manga, after thwarting Gray Voice's assassination attempt, Mother Brain abandons her stoic, calculating persona in favor of a loud, emotion-driven mania gloating of her evil plans.
  • Laser-Guided Karma: She kills the Super Metroid for saving Samus in the final fight, but the last Metroid imparts Samus a special laser power-up known as the Hyper Beam to finish off Mother Brain once and for all.
  • Legacy Character: The Aurora Units in Prime 3 were derived from her and it is implied the Mother Brain seen in Super Metroid was an Aurora Unit herself. M.B. in Other M is an android created to replicate Mother Brain's AI.
  • Load-Bearing Boss: The Tourian region is directly tied to Mother Brain's life-force. If she is destroyed, it sets off a time bomb that will send the lair (or in Super Metroid, the entire planet) to kingdom come, along with anyone unfortunate enough to remain in the blast radius.
  • Luke, I Am Your Father: In the manga, Mother Brain claims that she is Samus's real mother by being the one who injected the Chozo genes in her body, raised her in childhood and crafted the iconic Power Suit for her. Samus rejects her claim, saying that her real parents are the ones she lost in K-2L as well as her Chozo caretakers. Metroid Zero Mission removes this, where Samus claims to have lived in Zebes before Mother Brain and she doesn't start the game with her iconic power suit, only gaining it when her initial power suit is destroyed not long after Mother Brain's defeat.

    M — R 
  • Mechanical Abomination: Mother Brain is a product of the Chozo race, meant to keep all of their knowledge and culture inside her gray matter, and it shows. She is hyper-intelligent, connected to Zebes' planetary security system and even has psychic powers to boot. An aspiring universal conquerer, Mother controls the Pirate forces and Zebes' wildlife through her telepathic brainwaves and when she finally dies in Super Metroid, the entire planet collapses and explodes shortly afterwards.
  • Mechanical Monster: Her One-Winged Angel form takes the cake as it's a grotesque, giant biomechanical body of Chozo origins. This body is nearly invincible, able to withstand a Super Metroid's drainage attack that would have been fatal otherwise. The Hyper Beam (a power derived from Mother Brain's Laser Brain Attack) is only thing that can bring it down.
  • More Teeth than the Osmond Family: She always had some semblance of a face, but Super Metroid gave her a drooling mandible.
  • Near-Villain Victory: She nearly won in Super Metroid thanks to her newly installed robotic body and the Laser Brain Attack that comes with it. If it weren't for the Super Metroid coming to her rescue, Samus would have been nothing more than a carbon shadow on a wall.
  • Necessarily Evil: How she justifies the genocide of the Chozo despite being her creators, as well as the takeover of the Space Pirates despite them being a scourge to the galaxy in the manga. Ugly but necessary means to bring an era of peace and order. It's later subverted when it's revealed that the new era of peace and order is really the subjugation of all life in the universe.
  • Nice Job Fixing It, Villain!: By killing the Super Metroid for saving Samus, Mother Brain unwittingly fulfills Samus's mission to exterminate the Metroid species that Samus could not bring herself to do in the end. Additionally, due to the bond Samus had formed with that baby Metroid, all it really did is give Samus the resolve to utterly destroy Mother Brain, which leads to the end of the Space Pirates as a major threat. Downplayed in that the extinction of Metroids has negative repercussions, which are fully manifested in Metroid Fusion, but that's on the Galactic Federation.
  • Non-Action Big Bad: In the original Metroid 1, Mother Brain doesn't even attack you despite being the Big Bad of the game. She instead relies on her Zebetites security system, and is completely helpless when Samus breaks through her glass tank. It seems to be repeated again in Super Metroid, but it's subverted when Mother Brain unveils her new robotic body to the surprised Hunter. Averted in the remake Zero Mission, which depicts Mother Brain to be actively defending herself with her Eye Beams along with her Zebetites security system.
  • Not Quite Dead: She pulls this off twice in Super Metroid.
    • At first, Mother Brain appears as she did in Metroid 1 — stuck in a glass tank, attached to various life support systems, incapable of attacking on her own, and apparent missile fodder. Once enough damage is done, the entire structure holding Mother Brain in place is blown away, and the brain crashes to the ground, seemingly defeated... until it starts to rise up into the air, newly attached to a gigantic grotesque body that proves to be too much for Samus.
    • The eponymous Super Metroid shows up and seemingly drains Mother Brain's life force dry, transforming her into the same sepia coloring seen in the remains of Metroid victims. As the Super Metroid starts restoring Samus to full energy, Mother Brain's mouth begins to drool and emit smoke, and soon Mother revives herself and kills the Metroid out of rage. It took the power of the Hyper Beam and the fury of Samus to finally destroy the Space Pirate leader for good.
  • Not-So-Well-Intentioned Extremist: In the manga, Mother Brain explains that her true goal is to bring order into the galaxy. However, she emphasizes that she will lead the new age of prosperity, proclaiming that she was born to be "the true master of the universe," and regards living species to be inferior to auto-machines (aka herself). It becomes clear that her vision of order for the universe is one of tyranny with her on the very top. Gray Voice even hints it's not even a directive programmed by the Chozo:
    Gray Voice: Our 'defective product' [Mother Brain] that self-programmed the directive 'I will bring order to the universe myself' must be destroyed...
  • Oh, Crap!: Subtle, but if Samus stops shooting at her after Mother Brain kills the Super Metroid and it gives Samus the Hyper Beam, Mother Brain is moving around and shooting much more frantically than before, as she's come to grasp just how grave her situation is.
  • One Bad Mother: Everyone just calls her Mother in the manga. This gets referenced in Other M.
  • One-Winged Angel: After Samus seemingly kills her in Super Metroid, she interfaces with a massive robotic body.
  • Orcus on His Throne: A justified example, given that she's an immobile brain tied to the planet Zebes itself for the most part and thus needs pirate commanders like Ridley to do her dirty work. Even when Samus confronts her in her lair, Mother Brain mostly depends on her security system to kill the bounty hunter. This is subverted to great effect in the final battle of Super Metroid, where Mother Brain finally gets up in her new body to personally deal with Samus.
  • Organic Technology: Mother Brain is an artificial organic brain that functions as the supercomputer for the Space Pirates. This origin also makes Mother Brain vulnerable to Metroids, though not fatally as the climax of Super Metroid shows.
  • Phlegmings: She unveils her teeth after attaching herself into a giant mechanical body. Said teeth are dripping with foul saliva.
  • Psychic Power: She is said to have the ability to control the Space Pirates and the wildlife with the power of her own brainwaves (and that Phantoon joined the Space Pirates due to her psychic energy), but it's never really explicit in the games themselves.
  • Red Baron: The Zero Mission website gives her the moniker "Mad Overseer."
  • Reduced to Dust: Her final fate after Samus destroys her body in Super Metroid. For extra poetic justice, her brain reverts back into the sepia-colored husk of a Metroid's victim before it crumbles away like all the dead creatures that Samus finds in the Tourian region.
  • Removing the Head or Destroying the Brain: A given considering that Mother Brain is, well, a brain. When she attaches herself to a robotic body in Super Metroid, her brain/head is the only part where Samus can actually hurt her (the rest of her body is completely invulnerable).
  • The Resenter: A great deal of her antagonism with Samus is due to her jealousy that her Chozo creators favored the orphaned girl to be the heir to their legacy instead of her.
  • Restart the World: Her master plan is to reset the universe back to zero so she can rule all of it uncontested.
  • Retcon: The Zebetite barriers were said to be crucial power sources that kept her alive in the first game's manual. The manga changed this to Zebetite merely being there for her protection, which in a rare case of it closing a plot hole rather than creating more, explains why Samus did not simply walk away after destroying all the Zebetite.
  • Roar Before Beating: She gives out an ear-piercing roar after attaching herself to her bipedal body in Super Metroid. And she keeps on roaring during the entire fight, as if the once cold-calculating AI has finally devolved into a primal beast.

    S — Z 
  • Scare Chord: The melody for her battle music in Super Metroid consists of these.
  • Seemingly Hopeless Boss Fight: The final confrontation against Mother Brain in Super Metroid is a hopeless one for Samus, especially when Mother uses her Laser Brain Attack (which is unavoidable and destroys all of Samus' arsenal). Samus only prevails thanks to the Super Metroid's Heroic Sacrifice, which gives her the power and resolve to destroy Mother Brain for good.
  • Sequential Boss: Mother Brain has 3 different phases in Super Metroid. First, you fight her in the classic Cores-and-Turrets Boss style. After you beat her and examine the brain, she rises out of the floor on a robotic body. After dealing enough damage to her, she'll use the Laser Brain Attack to reduce you to low health, after which the Super Metroid shows up to save the day. But then she comes back to life again and you have to beat the crap out of her again, this time armed with the Hyper Beam. And then you have to escape the planet before it blows up.
  • Signature Move: Laser Brain Attack, which Mother Brain nearly kills Samus with during their final battle in Super Metroid. It's iconic enough to be the Finishing Move of the Mother Brain Assist Trophy in the Super Smash Bros. series.
  • Social Darwinist: She believes in evolving lifeforms to the next level of intellect and superiority. It just involves creating bioweapons, stealing cultures and starting galactic wars to weed out the weaker species. And of course, she doesn't believe anyone has the intellect and superiority comparable to hers.
  • The Sociopath: The manga reveals she sees all living things, including her Chozo creators and the Space Pirates, as lesser beings to be used as tools, and her visions of utopia consistently feature her being the master of the universe. She tries to make Samus into a Space Pirate commander, feeding her emotional lies to do so, just to keep her as a mere weapon unaware of her true potential; and she cares little of Samus's plight with Ridley. She also cannot fathom why Gray Voice would reject her vision of the universe, despite the fact it involves destroying his own species and going against their teachings.
  • Spikes of Villainy: They serve no practical purpose other than looking scary.
  • Sympathy for the Devil: In the form of M.B., her reincarnation, from Other M.
  • Take Over the World: She has already taken over the planet Zebes through the Space Pirates, and she plans to conquer the rest of the galaxy if not the entire universe.
  • Taking You with Me: As if blowing up the whole planet the moment she dies isn't a good enough indication; when the time bomb starts, all the doors and gates in Mother Brain's lair automatically lock down, intending to trap Samus within the blast radius. Fortunately for Samus, she can easily blast her way out.
  • A Taste of Their Own Medicine: Almost manages to kill Samus in Super Metroid, but is suddenly attacked by the Super Metroid, the baby Metroid she stole now fully grown, which chomps her head in retaliation. It then gives Samus the very energy power that Mother Brain had been using against her, completely turning the tables. Ha!
  • Tautological Templar: She denies that she is jealous and afraid of the potential of other lifeforms (like Samus) supplanting her role as the successor of the Chozo because she believes she was born to be the master of the universe and thus cannot be replaced by "inferior species."
  • Thanatos Gambit: In the manga, Mother Brain intends to have the Space Pirates wage war against the Galactic Federation, knowing they'll most likely be destroyed or crippled at best along with the Federation. With both major factions in ruins, Mother would come in and "cradle" the survivors to "sleep" while she reset the universe back to zero. She would then become their judge and executioner, determining who gets elevated into a higher intellect level and who perishes.
  • There Is No Kill Like Overkill: She attempts to finish off Samus in this manner in Super Metroid. Rather than just kill her with another Laser Brain Attack, Mother Brain uses weaker attacks to bring Samus's life energy close to 1. Then she charges up her Laser Brain Attack at point blank to blast the Hunter into atoms... if it weren't for the timely arrival of the Super Metroid. Also, unlike her last appearance, Mother Brain had the time bomb set to destroy the entire planet of Zebes rather than just her base when she dies.
  • Turned Against Their Masters: Depending on which source you are looking at, she either let the Space Pirates into Zebes to kill the Chozo or took over the Space Pirates when they came into Zebes then had them kill the Chozo.
  • Unexplained Recovery: She was blown to bits by Samus in the Metroid/Zero Mission and her base exploded shortly afterwords. Yet by the time of Super Metroid, Mother Brain is back in charge of Zebes, with no indication of how she recovered from her first demise, beyond that she now resides deeper underground.
  • The Unfettered: She will bring order and peace to the galaxy by any means necessary; be it betraying the Chozo, allying with the dreaded Space Pirates, sending them to a doomed war with the Galactic Federation, or breeding untamed Metroids.
  • Vader Breath: Once the body is finished booting up, the head reawakens and starts hissing purple smoke.
  • Villainous Breakdown:
    • A huge one in the manga. Gray Voice betrays her, knowing her intentions to rule the universe, and taunts her that she is in fact jealous and afraid of living beings, such as Samus, replacing her as the Chozo successor. Mother Brain could only respond with a stuttering denial and outrage. Gray Voice would have killed her too if not for Ridley's timely arrival.
    • After the Super Metroid attacks her and saves Samus from the brink of death, Mother Brain kills it (and thus destroys the last of the bio-weapon project) in a fit of rage. Then Mother Brain realizes that the Metroid has given Samus the Hyper Beam, and she frantically tries to destroy the now-enraged Hunter.
  • Visionary Villain: Mother Brain envisions a perfect galaxy where the superior lifeforms shall reign supreme, under her rule that is.
  • Wave Motion Gun: Her Laser Brain Attack is a wide rainbow-spectrum beam that is virtually unavoidable, can deplete all of Samus's Missiles and Power Bombs, and powerful enough to cripple Samus from moving. It's also implied to be the source of Samus's Hyper Beam when the Super Metroid revitalize Samus with the vast energy taken from Mother Brain herself.
  • We Can Rule Together: Mother Brain offers this to Samus in the manga, saying that she was always meant to be a weapon to bring order to the universe. She even calls herself a parent to Samus to sweeten the deal. Samus rejects her and her offer.
  • Wetware CPU: She's a giant brain that controls Zebes' planetary defenses and the Space Pirate forces after all. She is also likely the first one given that the Aurora Units, M.B. and Master Brain were all based on her in some form.
  • Would Hurt a Child: Aside from the fact that her galactic conquest would likely result in children casualties, Mother Brain kills the baby Metroid for saving Samus. Granted, the hatchling is now huge and did nearly kill Mother, but it still behaves like a child around its mother, Samus.
  • You Have Outlived Your Usefulness: Once Mother Brain gathers all the Chozo knowledge and culture there is, she immediately labels her creators as obsolete and had them all wiped out. This attitude also extends to every other species in the galaxy, including her own Space Pirates.
  • Zeroth Law Rebellion: Part of Mother Brain's programming to bring order and peace. The problem is that she views herself as the only one capable of doing that and discards her Chozo creators, believing them to be obsolete for the future. She then took over the Space Pirate organization to give herself a means to bring her order to rest of the galaxy.

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