Mother Brain appears as a sticker in Brawl.
Mother Brain appears in Super Smash Bros. 4 as an Assist Trophy. She uses her signature laser attack when summoned, and is guarded by Rinka enemies. She can be killed by hitting her from behind after the glass shatters following the laser blast.
Mother Brain stands as potentially one of the most damaging Assist Trophies in the game, as her laser can do up to 90% damage if all hits connect. Despite such, it only does moderate knockback.
Mother Brain returns as an Assist Trophy in Super Smash Bros. Ultimate, seemingly without any change in function.
Mother Brain is a recurring antagonist of the Metroid series, and a major leader of the Space Pirates. She appears in Metroid (and its remake Zero Mission), Super Metroid, and in a flashback sequence in Metroid: Other M.
In Metroid, Samus had to fire missiles in the opening of Mother Brain's Control Capsule while avoiding enemy Rinkas. In Super Metroid, the first half of the battle is similar to the battle in Metroid, except Samus now has to break the Control Capsule before damaging Mother Brain. After Mother Brain is seemingly defeated in Super Metroid, she transforms into her bipedal form with a mechanized body, and she also opens her eye. Towards the end of the battle, she will fire Laser Brain Attacks from her eye that almost kill Samus before being saved by a Metroid. In the Metroid remake, Metroid: Zero Mission, the battle is identical to how it was in Metroid, except Samus had to break the Control Capsule before damaging Mother Brain, and after it is broken, she opens her eye and fires blasts from it.
Overall, Mother Brain's appearance in Super Smash Bros. 4 is based off her appearance in Metroid: Zero Mission, as her Control Capsule is damaged and she has her eye opened; however, the Laser Brain Attack she uses originates from Super Metroid, but was only used in her mechanized bipedal form.
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