BB is a Transformer in the Beast Wars Universe. He is one of the Predacons stationed on the planet Gaea. His vehicle mode is a Fighter Jet and Tank. He is serving Galvatron as well. He can combine with Starscream to form "Formation Scream". He was later upgraded into Max-B whose beast mode is a Transmetal 2 Wolf. Max-B likes his new beast mode.
In the marvel cinematic universe BB and Starscream there were battling Captain Marvel and Captain Marvel shot her energy blast which possibly kill them but when they absorbed the energy and he became the transmetal 2 wolf becoming Max-B and he like his new form.