Kang and Kodos Johnson are a duo of recurring characters in the animated television series The Simpsons. Kang is voiced by Harry Shearer and Kodos by Dan Castellaneta. They are aliens from the fictional planet Rigel VII and appear almost exclusively in the "Treehouse of Horror" episodes. The duo has appeared in at least one segment of all twenty-six Treehouse of Horror episodes. Sometimes their appearance is the focus of a plot, other times a brief cameo. Kang and Kodos are often bent on the conquest of Earth and are usually seen working on sinister plans to invade and subjugate humanity.