Greg Baldwin is an American voice actor. He is best known for inheriting numerous voice roles originated by Japanese-American actor Mako following his death in 2006, including Aku from the fifth season of Samurai Jack (2001) and the video game Cartoon Network Universe: FusionFall, Iroh in the third season of Avatar: The Last Airbender (2005) (a role he later reprised in its sequel series The Legend of Korra (2012)), and Master Splinter in TMNT (2007). Baldwin also made guest appearances on SpongeBob SquarePants (1999) The Marvelous Misadventures of Flapjack (2008), and Star Wars: The Clone Wars (2008).