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Mother Brain

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Mother Brain
Mother Brain SSBU artwork.png
Super Smash Bros. Ultimate artwork
First appearance Metroid (1987)
Latest appearance Metroid Dread (2021, cameo)

Mother Brain is a large, biological computer resembling a cycloptic, spiked brain and the leader of the Space Pirates. Since her debut in Metroid, Mother Brain has appeared as an antagonist, in various Metroid titles, often as the main one, and is the main antagonist of Captain N: The Game Master.


Captain N: The Game Master

Mother Brain in Captain N: The Game Master

Mother Brain was given a face and voice for her appearance in the animated television series, Captain N: The Game Master. She was the primary antagonist of the series, with various villains working under her. She was portrayed by acclaimed soul musician, Levi Stubbs.

Nintendo Comics System

In the Nintendo Comics System story "Duh Stoopid Bomb!", the name "M. Brain" can be seen on Wooster's list of people who think the Mushroom King is dumb. She also reprises her role as the main antagonist to Captain N in the Captain N: The Game Master series of comics.

Super Mario RPG: Legend of the Seven Stars

Mother Brain is briefly mentioned by Samus in Super Mario RPG: Legend of the Seven Stars, who claims to be "resting up for Mother Brain" at the Rose Town Inn.

WarioWare, Inc.: Mega Microgame$!

In WarioWare, Inc.: Mega Microgame$!, Mother Brain appears in the microgame Metroid, a recreation of the final boss of the original Metroid. To win the microgame, Samus must blast Mother Brain repeatedly with missiles while dodging her attacks to defeat her.

Super Smash Bros. series

Super Smash Bros. for Nintendo 3DS / Wii U

Mother Brain appears as an Assist Trophy in Super Smash Bros. for Nintendo 3DS / Wii U. When she first appears, several Rinkas appear that damage opponents, and since they are energy-based, Rinkas can be absorbed or reflected. After some time, Mother Brain then uses the Laser Brain Attack for massive damage. When she uses the attack, however, the glass surrounding her container shatters, allowing opponents to attack and defeat her.

Super Smash Bros. Ultimate

Mother Brain returns as an Assist Trophy in Super Smash Bros. Ultimate, having no difference in behavior. She is also featured as a spirit.


Super Smash Bros. Brawl sticker

Name Image Game Effect
Mother Brain SSBB Sticker Mother Brain.png Metroid: Zero Mission Flinch Resistance +147

Super Smash Bros. for Nintendo 3DS / Wii U trophy

Name 3DS trophy Wii U trophy Category Appears in Trophy Box Description
Mother Brain SSB3DS Trophy Mother Brain.png SSBWU Trophy Mother Brain.png Assist Trophy NES Metroid (08/1987)
SNES Super Metroid (04/1994)
26: The Beginning of Metroid Flag of USA.png Hailing from the Metroid series, this evil boss resides on the planet Zebes. When she appears in Smash Bros., she attacks with energy projectiles and a beam from her eye. It's actually possible to defeat her, and for once doing so won't start a self-destruct sequence.
Flag of Europe.png A mainstay of the Metroid series and the final boss Samus faces on Planet Zebes. In this game, she grows to a gargantuan size and fires all sorts of energy blasts at you. Good news: you can beat her! Better news: doing so won't trigger a self-destruct sequence forcing you to make your escape!

Super Smash Bros. Ultimate spirit

No. Name Image Series / game Type Class Strength / effect(s) How to obtain Spirit battle
Opponent(s) Battle conditions Stage Song
278 Mother Brain SSBU Spirit Mother Brain.png Metroid Series Primary (1) Ace Shield
Can be enhanced to Mother Brain (2nd Form) at Lv. 99
World of Light (Final Battle); Spirit Board Dark Samus Rule: Energy Output ↑; Assist Trophy Enemies (Mother Brain)
  • Hostile assist trophies will appear
  • The enemy favors neutral specials
  • All fighter's energy attacks have increased power
Brinstar Depths (Ω) Escape



  • In the Brinstar stage seen in many Super Smash Bros. games, a massive brain can be seen occupying the background, writhing and occasionally sprouting wound-like growths whenever it comes in contact with the acid. Brinstar Depths contains another brain, this one smaller and trapped within a spherical spiked cage. It is unclear if either of these are intended to represent Mother Brain, though they do not particularly resemble any form of hers from the Metroid franchise.
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