The Brain, seen in the Fireball XL5 episode Hypnotic Sphere, was on planet Suventa, inside a glass container. The Brain wanted to use the fuel from the Space Fuel Tankers, which would power thirty more spheres. Then they would go out and hypnotise the universe and the brain would become in charge of everything. Steve Zodiac kills the brain by destroying the heat system, causing the brain to freeze to death.

The Brain was voiced by John Bluthal.

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