Patrick Warburton is one of the busiest "Seinfeld" alumni, and has been working steadily since the show ended. He is particularly popular in the cartoon world, where he's provided voices for "Family Guy," "The Tick," "The Venture Bros." and "Robot Chicken." The 51-year-old also appeared in more than two dozen movies ("Men in Black II," "Get Smart") and recently starred in the CBS series "Rules of Engagement."—XFINITY Entertainment Staff (Photo: Jesse Grant/Getty Images)
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