Mermaid Man and Barnacle Boy

Mermaid Man and Barnacle Boy
Mermaid Man and Barnacle Boy
SpongeBob SquarePants characters
	Mermaid Man (left) and Barnacle Boy (right)
First appearance	"Mermaid Man and Barnacle Boy"; SpongeBob SquarePants; August 21, 1999;
Created by	Stephen Hillenburg
Voiced by	Mermaid Man: Ernest Borgnine (1999–2012); Joe Whyte (in SpongeBob SquarePants: Employee of the Month and SpongeBob SquarePants: Battle for Bikini Bottom); Joe Alaskey (in SpongeBob SquarePants: Lights, Camera, Pants!); Daniel Hagen (in SpongeBob Moves In); Tom Kenny (young; in "Mermaid Man and Barnacle Boy" and The Patrick Star Show); Adam West (young, in "Back to the Past"); Barnacle Boy: Tim Conway (1999–2012); Burt Ward (young; in "Back to the Past"); Tom Kenny (young; in The Patrick Star Show);
In-universe information
Species	Humans
Occupation	Superheroes
Origin	Shady Shoals Rest Home, Bikini Bottom, Pacific Ocean

Mermaid Man and Barnacle Boy are a duo of fictional characters from the American animated television series SpongeBob SquarePants. They were respectively voiced by guest stars Ernest Borgnine and Tim Conway, who both previously starred in the 1960s sitcom McHale's Navy. Mermaid Man and Barnacle Boy first appeared in the eponymous season one episode that premiered on August 21, 1999, and have since been featured as recurring characters. Following the deaths of Borgnine and Conway in 2012 and 2019 respectively, the characters have been relegated to non-speaking cameos after creator Stephen Hillenburg made the executive decision to not recast them.

Mermaid Man and Barnacle Boy are two elderly superheroes who live in a retirement home and are stars of SpongeBob and Patrick's favorite television show. Mermaid Man appears to suffer from memory loss and dramatically yells "Evil!" whenever he hears the word, while Barnacle Boy seems to be the more sensible and more irritable of the two. They are among the few humans who can breathe underwater and speak to the inhabitants of Bikini Bottom. They made their final regular appearances in the season 9 episode "Patrick-Man!"