Saburo "Sab" Shimono (born July 31, 1937) is an American actor. He began his career on stage on Broadway and in regional theaters, starring in musicals like Mame, Lovely Ladies, Kind Gentlemen, and Pacific Overtures. He has appeared in dozens of films, including Midway (1976), Gung Ho (1986), Presumed Innocent (1990), Teenage Mutant Ninja Turtles III (1993), Waterworld (1995), Southland Tales (2006), and Old Dogs (2009). He also has extensive television credits including episodes of M*A*SH, Quincy, M.E., Remington Steele, The X-Files, Seinfeld, Mad Men, and The Blacklist. Shimono's voice roles include Uncle Chan in Jackie Chan Adventures, the Emperor in Samurai Jack, and Monk Gyatso in Avatar: The Last Airbender.