|| "It's Squidward, silly!"
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The Atomic Flounder is a retired villain Mermaid Man and Barnacle Boy, who can blast people with his atomic breath.
In "Mermaid Man and Barnacle Boy II", he is gray, has a green shirt with checkered pants and a black hat on his head. His super villain form wears a hazmat suit.
In "The Bad Guy Club for Villains", he has a shark fin, two fish legs, human hands, one eye, an eye stalk on the left side of his head, and has a shark tail.
|| I can turn into a skyscraper!
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- The Atomic Flounder's atomic ray, which was seen in "Mermaid Man and Barnacle Boy II," is possibly a reference to Godzilla.
- He was actually a fish in a lab experiment, but it went haywire and he became the villain he is now.
- The Atomic Flounder is the only retired villain and the only one who has aged besides Viro Regnato.