<Tr> <Th> Gender </Th> <Td> Male </Td> </Tr> <Tr> <Th> Nationality </Th> <Td> American </Td> </Tr> <P> Mermaid Man and Barnacle Boy are fictional characters 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 . They are a spoof of both Aquaman and Aqualad and Batman and Robin . 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". </P> <P> Mermaid Man and Barnacle Boy are semi-retired superheroes in the fictional city of Bikini Bottom . Within the show's fictional universe, they are real superheroes . In addition to fighting crime, the duo has been extensively franchised throughout Bikini Bottom, including the television series The Adventures of Mermaid Man and Barnacle Boy, a long - running comic book series, trading cards, and kids' meals at the Krusty Krab . Mermaid Man and Barnacle Boy currently reside at Shady Shoals Retirement Home . However, their two biggest fans, SpongeBob SquarePants and Patrick Star, convince them to come out of retirement in their first appearance . </P>

Who did the voice of mermaid man in spongebob
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