Mother Brain
BM Boss1
Battle with Mother Brain


Area 1


Hyper Beam

Pause Trick




The Mother Brain is the boss of Blaster Master's Area 1. When defeated, it drops the Hyper Beam.

In Blaster MasterEdit


Mother Brain appears to be a giant, mutated jellyfish, that sports the color red.


Mother Brain slowly follows Jason wherever he goes. It is protected by a spinning, contorting shield of mini "brains".

As long as the player keeps their distance from Mother Brain, and avoids the mini brains, they can simply wail on it with a barrage of grenades.

Other AppearancesEdit

Blaster Master (novel)Edit

The Mother Brain was the mass of protoplasm that Jason fought at the end of each area. After the first encounter with the real form, the Plutonium Boss cast a holographic form over the rest, of something that would either terrify Jason or invoke such emotions that would make him unable to fight, such as with Fred.

Blaster Master: Enemy BelowEdit

An identical boss appears in Enemy Below, known as the Jellyfish.

Blaster Master ZeroEdit

Mother Brain returns as the guardian of the Hyper Beam, now intermittently dismissing its (now destructible) orbiting brain shields to act as a stationary turret and rapid-fire a stream of brains at Jason. It is also the only top-down mode boss to double-dip for rematches in Area 9, with the second fight being against two Mother Brains with a shared life bar.

In her EX Character mode, Shantae can acquire the Brainy Dance, allowing her to transform into a Mother Brain in top-down mode to float over pits and launch auto-fire brain swarms.


  • In prerelease photos and articles of Blaster Master Zero, Mother Brain is referred to as Chlameatle.