Barnacle Man is a villain who is only seen in the episode: Mermaid Man and Barnacle Boy V. He is part of Every Villain Is Lemons. He is the alter ego of Barnacle Boy when he was briefly a villain. He has the same powers as Barnacle Boy. He is just Barnacle Boy with a cape.
- The same powers as Barnacle Boy
- The same weaknesses as Barnacle Boy