John Ratzenberger as Cliff Clavin.

John Ratzenberger is the actor who plays Cliff Clavin. He appeared in all 271 episodes of Cheers . Ratzenberger was born on April 6, 1947 in Bridgeport, Connecticut, USA. Ratzenberger is also known for playing Hamm in the Toy Story franchise and appears in every feature-length Pixar film to date.

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