SpongeBob SquarePants is an American animated television series created by marine biologist and animator Stephen Hillenburg that debuted on Nickelodeon in the United States on May 1, 1999. The regular voice cast consists of Tom Kenny, Bill Fagerbakke, Rodger Bumpass, Clancy Brown, Doug Lawrence, Jill Talley, Carolyn Lawrence, Mary Jo Catlett and Lori Alan. Most one-off and background characters are voiced by Dee Bradley Baker, Sirena Irwin, Bob Joles, Mark Fite, Thomas F. Wilson, Carlos Alazraqui and Jess Harnell. Throughout the show's run, it has employed numerous guest stars from many ranges of professions. Repeat guests include Ernest Borgnine, Tim Conway, Brian Doyle-Murray, Marion Ross, John O'Hurley and Michael McKean.