"Black BB" is a black and evil clone of BB. Who is already evil.
Beast Wars II cartoon
Voice actor: ? (Japanese)
After a mysterious device was uncovered by the Autorollers and brought to the Predacon base, BB investigated the machine's properties, accidentally activating it to scan himself and create a black and gray duplicate of him. The two BBs got into a scuffle, which prompted Galvatron to end the distraction by ordering the Predacons to shoot the clone. Black BB's Death was signaled by his outline being filled with a rainbow effect and then him disappearing. The Black Lio Convoy
Note:The above summary was written by someone who does not speak Japanese, and some fine points may have been lost in translation. (Fair warning.)