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"Upcoming guest stars for The Simpsons and Family Guy have been announced by Fox. Both animated series will welcome a lengthy list of performers in autumn.  The Simpsons&amp;#039; 26th season will feature the voices of The Newsroom&amp;#039;s Jane Fonda, Spider-Man&amp;#039;s Willem Dafoe and Parks and Recreation&amp;#039;s Nick Offerman. Comedians Sarah Silverman and Jeffrey Ross, as well as Frasier&amp;#039;s David Hyde Pierce will also guest star in the Fox series.  Meanwhile Seth Macfarlane&amp;#039;s Family Guy will welcome the guest voices of Liam Neeson, Julie Bowen of Modern Family and Allison Janney of Mom. Aside from an A-List line-up of actors, both series will also take part in a crossover episode. The crossover episode - entitled The Simpsons Guy - is set to air on Fox, September 28. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/the-simpsons/news/a585300/the-simpsons-and-family-guy-reveal-slate-of-celebrity-guest-stars/>