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.
Mona Simpson (The Simpsons) Mona Penelope Simpson (née Olsen) is a recurring fictional character in the animated television series "The Simpsons". She has been voiced by several actresses, including Maggie Roswell, Tress MacNeille, Pamela Hayden, and most prominently, Glenn Close. Glenn Close's performances as Mona have been well received by critics and she was named one of the top 25 guest stars on the show by IGN.