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Who? George Wendt, John Ratzenberger and Rhea Perlman show up on Kelsey Grammer's show "Frasier."
Why? Frasier runs into Cliff Clavin at the Boston airport and gets roped into attending his going-away party. Soon he's face-to-face with his past and partying it up with Norm and Carla while Niles, Martin and Daphne get to know the gang.