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William Jackson HarperNathaniel (voice)
Demetri Martin(voice)
Ron PerlmanFang (voice)
Courtenay TaylorCrash Test Scientist (voice)
Kari WahlgrenPenis Cream Scientist (voice)
Parker Deay(voice)
Ted DansonDr. Ray Petit (voice)
Kevin Michael RichardsonBilly (voice)Joe Chandler(voice)
Patrick StewartAvery Bullock (voice)Daisuke SuzukiToshi Yoshida (voice)
Eddie Kaye ThomasBarry Robinson (voice)
Curtis ArmstrongSnot Lonstein (voice)
Richard KindAl Tuttle (voice)
