In which year, did this earliest guest star in 1999 for SpongeBob SquarePants stop providing the voice?
SpongeBob SquarePants (season 1) The first season of the American animated television sitcom "SpongeBob SquarePants", created by former marine biologist and animator Stephen Hillenburg, aired from May 1, 1999 to April 8, 2000, and consists of 20 episodes. The series chronicles the exploits and adventures of the title character and his various friends in the fictional underwater city of Bikini Bottom. The show features the voices of Tom Kenny, Bill Fagerbakke, Rodger Bumpass, Clancy Brown, Mr. Lawrence, Jill Talley, Carolyn Lawrence, Mary Jo Catlett, and Lori Alan. Among the first guest stars to appear on the show were Ernest Borgnine and Tim Conway voicing the superhero characters of Mermaid Man and Barnacle Boy, respectively.
Dunces and Dragons "Dunces and Dragons", also known as "Lost in Time", is the sixth episode of the fourth season and the 66th overall episode of the American animated television series "SpongeBob SquarePants". It was written by Zeus Cervas, Erik Wiese and Tim Hill, and the animation was directed by supervising director, Alan Smart and Tom Yasumi. Cervas and Wiese also functioned as storyboard directors. The episode originally aired on Nickelodeon in the United States on February 20, 2006 as a half-hour special.