Guest Stars Mary Elizabeth Ellis voices Waitress T.J. Hoban as Rex Jessica Collins as Jackie Denardo Peter MacKenzie as Doctor Josh Groban as Himself Co Starring Raymond Lee as Cashier April Scott as Glenda the Gorgeous Gunman Isabella Crovetti as Sarah Brian McGovern as Tom Stuart Allan as Jack Andrew Thacher as Detective Seth Ayott as Gunman Brian Fong as Old Asian Man Justin Lopez as God Christine Clayburg as Interviewer