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"Conan O&amp;#039;Brien is to guest star in Family Guy. O&amp;#039;Brien will be playing himself in an episode of Seth MacFarlane&amp;#039;s animated series that sees Peter and Quagmire become a singing duo after discovering that they can scream in harmony.   Peter and Quagmire go on to make an appearance on Conan, which proves to be a disaster for the duo, according to Entertainment Weekly. O&amp;#039;Brien famously wrote for fellow Fox series The Simpsons early in his career, and made a cameo on that program in 1994. Downton Abbey&amp;#039;s Michelle Dockery has also lent her voice to an upcoming episode of Family Guy that spoofs the British period drama. Family Guy airs Sundays at 9/8c on Fox. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/ustv/news/a487057/conan-obrien-to-guest-star-in-family-guy/>