Unlike most guest voices, Gibson recorded the show along with the cast.
The series also regularly employs guest voices for various characters.
Certain episodes featured guest voices from the anime series, and listeners can send in comments of the show on the air.
Sunday's finale takes them to a country music festival loaded with guest voices, including Randy Travis's.
Each radio episode features guest voices from the anime series.
He has also provided several guest voices for episodes of The Simpsons.
He has also been a guest voice in an episode of The Simpsons.
He is also an occasional guest voice for the Washington Post.
Episodes will quite often feature guest voices from a wide range of professions, including actors, athletes, authors, bands, musicians and scientists.
He praises all the guest voices in their appearances, though mainly Tom Wolfe's.
