Mermaid fought crime with the Freedom Brigade until retiring twenty years ago. She married partner Mister Might and together they had a son, Awkward Man, who was forced to become a hero with the Inferior Five. Mermaid has become a teacher at Dean Egghead's Academy for Super-Heroes.
- This version of Mermaid (Earth-Twelve), including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths limited series. Even though versions of the character may have since appeared, this information does not apply to those versions.
- 4 Appearances of Mermaid (Earth-Twelve)
- 1 Images featuring Mermaid (Earth-Twelve)
- Quotations by or about Mermaid (Earth-Twelve)
- Character Gallery: Mermaid (Earth-Twelve)
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