<Tr> <Td> Mark Fite </Td> <Td_colspan="2"> Various characters </Td> </Tr> <Tr> <Td> Thomas F. Wilson </Td> <Td_colspan="2"> Various characters </Td> </Tr> <Table> <Tr> <Th> Actor </Th> <Th> Character (s) </Th> <Th> Notes </Th> </Tr> <Tr> <Th> Tim Conway </Th> <Td> Barnacle Boy </Td> <Td> Conway first appeared in 1999 with his former McHale's Navy co-star Ernest Borgnine, who voiced Mermaid Man; he has since appeared in over 15 episodes . </Td> </Tr> <Tr> <Th> Brian Doyle - Murray </Th> <Td> The Flying Dutchman </Td> <Td> Doyle - Murray appeared in ten episodes throughout the first eight seasons . He returned in 2017 for a guest appearance in "The Legend of Boo - Kini Bottom" after a six - year absence . </Td> </Tr> <Tr> <Th> Marion Ross </Th> <Td> Grandma SquarePants </Td> <Td> Ross has appeared since 2001 . </Td> </Tr> <Tr> <Th> John O'Hurley </Th> <Td> King Neptune </Td> <Td> O'Hurley has appeared three times as King Neptune since the character's first appearance in 2000 . </Td> </Tr> <Tr> <Th> Michael McKean </Th> <Td> Captain Frostymug Lonnie </Td> <Td> McKean appeared twice during the show's ninth season, voicing Captain Frostymug in "License to Milkshake" and Lonnie the shark in "Sharks vs. Pods". </Td> </Tr> </Table> <Tr> <Th> Actor </Th> <Th> Character (s) </Th> <Th> Notes </Th> </Tr>

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