Bob Papenbrook (September 18, 1955 - March 17, 2006) was an American voice actor. Fellow voice actors often nicknamed him "Pappy". He was very well-known in the worlds of anime and video game voice-overs for his voice acting of "gruff" characters. However, he was especially well-known in his various live-action voice-overs which, most notably, included the Power Rangers franchise. His best-known roles included the voices of Rito Revolto in Mighty Morphin' Power Rangers and Power Rangers Zeo, Shadowborg in Big Bad Beetleborgs, Scorpix in Beetleborgs Metallix, and Deviot in Power Rangers Lost Galaxy. Dynasty Warriors players will recognize him as the original voice actor of Zhang Fei. Aside from acting, he also taught kickboxing and other martial arts.On March 17, 2006, Papenbrook died of chronic lung complications at the age of 50. He is survived by his wife Debbie Rothstein and son Bryce Papenbrook (both of whom are also voice actors), as well as his parents and a brother.