Bill is the titular main antagonist of the Kill Bill series and particularly in Kill Bill Volume 2. He is the leader and founder of the Deadly Viper Assassination Squad, the older brother of fellow assassin Budd, and the archenemy of the Bride (AKA Beatrix Kiddo); having murdered her husband and caused the premature death of her unborn child (or so she believes), Bill is the ultimate goal of the Bride's "roaring rampage of revenge. He was portrayed by the late David Carradine.