BB3B is an animated UK children's television series produced by TellTale Productions in 2005. The entire series consists of thirteen episodes of twenty minutes each. It is shown on CBBC in the UK and ABC in Australia.
The series centres on the life of triplet children, a brother and two sister, Lucy Hanna and Louie, and their fears about their new baby brother, Billy Bob. BB3B actually stands for Billy Bob Third Baby. The plot generally involves a circumstance where the twins suspect the brother as usual of being an extraterrestrial, and they go on a wild adventure trying to prove it and stop him from launching an invasion.
The triplets are babysat by Chubba, a teenage boy with a fondness for pizza. Chubba often goes along with the idea of an alien brother, sometimes very seriously, and at one point he cracks and tells the parents of the twins plans to build a time machine. The show is set in the fictional American city of Sunnyfield, which is shown as having a central urban area and outer suburban area, the latter being the home of the family portrayed. The twins' grandmother lives in a trailer in the house's front garden.