The Control Capsule is the glass tank in which Mother Brain resides in her appearances in Metroid, Metroid: Zero Mission and Super Metroid. It is always located at the very end of a Zebesian Command Center. It is also heavily implied in various sources that the Control Capsule is the only thing protecting Mother Brain from being devoured by the Metroids at her disposal.
Samus Aran is always required to destroy it with Missiles before she is able to inflict damage to Mother Brain. In Metroid, a single Missile is sufficient to create an opening in the Control Capsule, but Zero Mission and Super Metroid forces Samus to fire numerous Missiles in order to do so. Interestingly, Zero Mission's capsule breaks down entirely as soon as an opening is made, while Super Metroid's falls apart gradually whether Samus is shooting Mother Brain directly or the remaining sections of the glass. The Metroid-based microgame in WarioWare, Inc.: Mega MicroGame$! and WarioWare, Inc.: Mega PartyGame$! still requires only a Missile, but the opening made in the glass will be larger.
- In Metroid, the broken Control Capsule varies in appearance when the game is played on different consoles. On the Family Computer Disk System, the entire lower half of the Control Capsule is shattered. On the Nintendo Entertainment System, only the middle of the Control Capsule is broken.
- The Cortex Chamber seems to be similar in function and appearance to the Control Capsule.
- Each Aurora Unit possesses a similar Aurora Unit tank, which is also seen in the Future Aurora Complex blueprint resembling the Zebesian Command Center. MB, who was modeled after Mother Brain, likewise had a similar tank in her original brain-like form.
- For more artwork, see Mother Brain/Gallery