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-five 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. The duo first appeared in season two's "Treehouse of Horror". The first drawing of Kang and Kodos came from writers Jay Kogen and Wallace Wolodarsky. The finished design was based on an EC Comics issue cover. Kang and Kodos had brief cameo appearances in several non-"Treehouse of Horror" episodes and have appeared as villains in several of The Simpsons video games.