This article is about the character herself. For the event match named after her, see The Mother Brain.
Mother Brain
Mother Brain
Metroid symbol
Mother Brain's artwork.
Universe Metroid
First appearance Metroid
MG appearance(s) Super Smash Flash 2
Species Bio-mechanical supercomputer
Gender Female
Alignment Evil
Company Nintendo

Mother Brain (マザーブレイン) is an organic super computer and a recurring antagonist in the Metroid series. In Super Smash Flash 2, she is an Assist Trophy character and a boss in the event, The Mother Brain.

Character description

Mother Brain resembles a human brain, though she is more spherical in shape. She has short metal spikes protruding from the top of her scalp, and a single large eyeball with an iris colored differently in each game she appears in. The brain is also a bright red. Several power cables come off the bottom of her body, and she appears to be permanently attached to the floor of her tank. Her tank, called the Control Capsule in the Super Metroid comic, is protected by Rinkas.

In Super Smash Flash 2

As an Assist Trophy

Mother Brain
SSF2 Mother Brain
Metroid symbol
Mother Brain in Super Smash Flash 2.
Universe Metroid
First appearance Metroid (1986)
Type Offensive
Effect Summons Rinkas that damage opponents and fires her Laser Beam Attack that deals heavy damage and knockback.
Rarity Common

In Super Smash Flash 2, Mother Brain is a common Assist. She summons Rinkas that bounce and deal flame damage on contact. Her eye also can rapidly change colors for about 2 seconds and then fire a colorful beam called the Laser Beam Attack that deals heavy damage (81%) and knockback in multiple hits. The beams are extremely accurate, and you can only dodge them by spot dodging, air dodging or shielding. Power shielding reflects the beam right back at Mother Brain. Players can also stand on her tank as if it was another platform. She can be attacked, but she has very high durability. When she is defeated, she explodes.

As a boss

Mother Brain
Samus on Tourian
Metroid symbol
Samus facing Mother Brain in Tourian.
Universe Metroid
Health points 200
Stage(s) it appears Tourian

Mother Brain can also be encountered as a boss in event #40, The Mother Brain. In this event, the player must defeat Mother Brain, who has 200 "hit points" (HP), using Samus in the stage Tourian. Mother Brain maintains the AI she has as an Assist. Additionally, her beams, when reflected at her, will deal immense damage.




  • Mother Brain, Metroid, and Starfy are the only Assist characters that the playable fighters can attack.
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