<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>
<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>
who does the voice of the captain in spongebob
who does the voice of the captain in spongebob
Michael McKean
Michael McKean