Batbrains are robots based off of bats. Their upper body is blue with their lower body being gray. They possess bat wings as well as a rocket for a tail that allow them to fly.
After Sonic the Hedgehog arrived in the Marble Zone, he decided to take shelter in a nearby ruin. Within this ruin, he encountered several Batbrains that attempted to attack him, but they were swiftly taken care of and had their Rockies released.