5. Hank Azaria
Best known as voicing Apu Nahasapeemapetilon, Moe Szyslak, Chief Wiggum, Comic Book Guy and numerous other characters on The Simpsons, Hank Azaria special guest-starred in the Family Guy episode "No Country Club for Old Men". Hank provides the voice of Reginald Barrington, who meets the Griffins when Chris befriends his granddaughter Amanda and scores an invitation to join his country club. At the club, Carter is less than pleased to see Peter, and tries to get him kicked out by kissing up to Barrington, before annoying him and getting kicked out himself, as Peter takes his place. Interesting fact - Azaria is the third Simpsons voice actor to have a role on rival Family Guy, after Nancy Cartwright and Dan Castellaneta.