John Ratzenberger has performed the voice of a character in every feature-length Pixar film to date.
He is, however, probably most famous for his Emmy-nominated role as Cliff Calvin on the TV show Cheers. Besides voicing a character in a Pixar films, he's also a team member of the Pixar Softball Team. Ratzenberger also hosted the documentary film Pixar: 20 Years of Animation and Counting. He said in an interview that out of all the characters he's voiced for Pixar, P.T. Flea from A Bug's Life is his favorite one that he's done. Ratzenberger was married to Georgina Stiny from 1984-2004 (divorced) by whom he has two children: a son named James John Ratzenberger born in 1987 and a daughter named Nina Katherine Ratzenberger in 1989.
- Toy Story, Toy Story 2, Toy Story 3: Hamm
- A Bug's Life: P.T. Flea / Fly in Bug Bar
- Monsters, Inc., Monsters University: Yeti
- Finding Nemo: Moonfish
- The Incredibles: The Underminer
- Cars: Mack / Car versions of Hamm, Yeti, and P.T. Flea
- WALL•E: John
- Ratatouille: Mustafa
- Up: Construction Foreman Tom
- Cars 2: Mack
- Brave: Gordon