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 yells a prolonged "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.