Mother Brain

From SmashWiki, the Super Smash Bros. wiki

Mother Brain is one of the recurring main antagonists in the Metroid universe, along side Kraid and Ridley. "She" is an organic, biological, supercomputer used by a group known as the Space Pirates to plan and lead their operations. Mother Brain was the final boss of Metroid as well as Super Metroid and is commonly considered Samus Aran's main enemy.

[edit] Trivia

• She appears as a sticker in Super Smash Bros. Brawl.