They appear to be pink, pseudopod creatures with a brainlike head and eyes. Without their special pods, they can't move very well. The mouth is on the chest as seen on Brain Pod 13.
History
Under construction.
Culture
Under construction.
Government
They work under the rule of Zurg so their original government is unknown.
In The Adventure Begins, Zurg asks a Brain Pod how long he's been in the organization, to which the brain pod replies by asking "In total or as a brain in a jar?", implying that they were originally a different species before his brain was taken out and put into a pod. However, in the episode Shiv Katall it is revealed that the brains are actually a species that resemble brains, complete with mouths and tendrils that serve as arms and legs, contradicting the original statement about the species.
