In which year, did this earliest guest star in 1999 for SpongeBob SquarePants stop providing the voice?
Mermaid Man and Barnacle Boy Mermaid Man and Barnacle Boy are fictional superheroes in the Nickelodeon animated television series "SpongeBob SquarePants". Mermaid Man was voiced by Ernest Borgnine from 1999 to his death in 2012, and Barnacle Boy is voiced by Tim Conway. Mermaid Man and Barnacle Boy were created and designed by Stephen Hillenburg. The characters debuted on August 21, 1999 in the series' episode "Mermaid Man and Barnacle Boy".
All Singing, All Dancing "All Singing, All Dancing" is the eleventh episode of "The Simpsons"' ninth season. It originally aired on the Fox network in the United States on January 4, 1998. In the fourth clip show aired by "The Simpsons", Homer claims he hates singing, so Marge shows family videos of musical numbers from the previous seasons of the series. The original material was directed by Mark Ervin and written by Steve O'Donnell. It was executive produced by David Mirkin. It features guest appearances from George Harrison, Patrick Stewart, and Phil Hartman, although these are all clips and none of them recorded original material for the episode.