<P> John Dezso Ratzenberger ( born April 6 , 1947 ) is an American actor , voice actor , and entrepreneur . He played Cliff Clavin in the TV show Cheers , for which he earned two Emmy nominations , and plays voice roles in the Pixar Animation Studios ' films , including Hamm in the Toy Story franchise , The Underminer in The Incredibles franchise and Mack in the Cars franchise . He is the only actor to appear in all of Pixar 's feature films , and with minor appearances in major films such as Superman and The Empire Strikes Back , he is one of the most successful actors of all time in terms of box - office receipts . </P>
<P> John Dezso Ratzenberger ( born April 6 , 1947 ) is an American actor , voice actor , and entrepreneur . He played Cliff Clavin in the TV show Cheers , for which he earned two Emmy nominations , and plays voice roles in the Pixar Animation Studios ' films , including Hamm in the Toy Story franchise , The Underminer in The Incredibles franchise and Mack in the Cars franchise . He is the only actor to appear in all of Pixar 's feature films , and with minor appearances in major films such as Superman and The Empire Strikes Back , he is one of the most successful actors of all time in terms of box - office receipts . </P>
who did the voice of mack in cars
who did the voice of mack in cars
John Dezso Ratzenberger
John Dezso Ratzenberger