Scruffy , various In addition to the main cast, Frank Welker voiced Nibbler and Kath Soucie voiced Cubert and several supporting and minor characters. Like The Simpsons, many episodes of Futurama feature guest voices from a wide range of professions, including actors, entertainers, bands, musicians, and scientists. Many guest-stars voiced supporting characters, although many voiced themselves, usually as their own head preserved in a jar. The studio would receive the completed script of an episode and create a storyboard consisting of more than drawings. It would then produce a pencil-drawn animatic with 1, frames. Rough Draft's sister studio in South Korea would render the 30,frame finished episode.