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Kennedy occasionally shared the role of Dr. Teeth with Bill Barretta until 2005, when Bill became his main performer, as John had been chosen to be Floyd Pepper's performer following Jerry Nelson's retirement until Matt Vogel took over that role.
- Jack's Big Music Show: Mel
- The Wubbulous World of Dr. Seuss: Horton the Elephant, Little Cat C, Mr. Knox, Norval the Fish
- Kermit's Swamp Years: Blotch, Arnie the Alligator, Hector the Spider Monkey
- The Muppets: Dr. Teeth (1991 - 2003), Floyd Pepper (2005 and 2006)
- Dinosaurs: Baby Sinclair (eyes), Spike, Sid Turtlepuss, Bryant, Mindy, Richard (animatronic/radio puppeteer only)