The Mother Brain is the leader of the Space Pirates
in the Metroid
universe. She is basically a giant brain in a tank of liquid and it was her idea to study the possibility of breeding and mutating the Metroid
species for conquest purposes. She first appeared at the end of the original Metroid NES video game
in the Tourian
area of Zebes
where she was basically a sitting duck for heroine Samus Aran
to blast. She returned in Super Metroid
for the Super NES
where she, once again, was pretty much an easy target... until her tank was shattered. That's when the brain rose from the ground, revealing a massively large and powerful alien creature
This embodiment of the Mother Brain fired energy orbs and electric shocks from her fingertips as well as the occassional bomb. Her most powerful weapon, however, is a blast of pure energy that spews from her gaping maw. Samus shot missiles at the creature's exposed brain, but eventually it took the power of the Metroid hatchling to defeat the Mother Brain once and for all. Upon her defeat she turned to dust and disintegrated.
Aside from her appearances in the Metroid series, the Mother Brain was also the main villain in the Captain N: Game Master animated cartoon. In her TV incarnation she had a face attached to her brain and was capable of sight and speech. Her two lackeys, Eggplant Wizard (from Kid Icarus) and King Hippo (from Punch Out!) carried out her evil plans, although in the end the three of them were always foiled by Captain N and his video game pals (Kid Icarus, Simon Belmont, Mega Man, Game Boy, and Princess Lana).