| This minifigure has only appeared in video game(s)|
Although this article is about an official minifigure, it never existed in physical form, or appeared in any official LEGO sets.
The Bat Brain is an enemy in the Sonic the Hedgehog series. They are bat-based Badnik models created by Dr. Eggman, as they first appear in Sonic the Hedgehog (1991). Bat Brains hang in dark caves, waiting for its victim to get below it and then attack from above.
Bat Brain, as its name implies, is a robotic bat with wings stretched over their bodies, showing only the tip of their blue head. Firm claws ensure the Badnik stays on the ceiling and it has an engine on its back for propulsion. Its wings, feet and engine are metallic gray in color, while its body is dark blue. In Sonic Lost World, Bat Brains also have small mouths with tiny fangs.