Mermaid Man is a retired superhero who lives in the Shady Shoals retirement home. In his younger days, he appeared on an old TV show with his young ward Barnacle Boy. SpongeBob and Patrick are huge fans of this show, and consider the two heroes their idols. In his old age, Mermaid Man is rather slow-witted and laidback, though the slightest mention of evil sends him off the wall. His cynical, more intelligent partner Barnacle Boy is pretty much all that's keeping him in check. He's also ornery when his nap is disturbed.