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Zebetite (ゼーベタイト) is the name of the theme that plays during the battle against Mother Brain in Metroid and Metroid: Zero Mission. It begins playing as soon as Samus enters the Zebesian Command Center. In Zero Mission, it also plays as Samus is descending into Norfair for the first time, during a cutscene where Mother Brain watches her from the Zebesian Command Center.
The theme is named after the life force of the Mother Brain, the Zebetite. The Aurora Unit 313 theme in Metroid Prime 3: Corruption, while a remix of Darkness, is arranged in such a way to resemble Zebetite. The boss itself resembles Mother Brain to a great degree in terms of physical appearance and attacks.