 The episode was also previewed at the 2007 Comic-Con International.In addition to the regular cast, actors Chevy Chase and Beverly D'Angelo, musician Mick Hucknall, singer Helen Reddy, and political commentator Rush Limbaugh made guest appearances.Recurring guest voice actors Phil LaMarr, Johnny Brennan, Jon Benjamin, Lori Alan, Adam West, Ralph Garman, writer Danny Smith, writer John Viener, executive producer Steve Callaghan, Kirker Butler, executive producer Mark Hentemann writer Wally Wingert and Alec Sulkin also made minor appearances in the episode.