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".
Chris Gifford (actor) Chris Gifford (born May 3, 1959) is a writer and executive producer at Nickelodeon, where he co-created the Peabody Award-winning children's series "Dora the Explorer" where he was the voice of the Big Red Chicken, the Grumpy Old Troll, the Pirate Captain Pig, etc. and its successful spin-off "Go, Diego, Go!". He was also a cast member (Danny) on the 1980s syndicated children's series, "The Great Space Coaster".