Dr. Linda Denman is a Marine Biologist, and a huge threat to the girls. In "The Denman Affair" Lewis applies for a job with her so he can use her high grade technology to study a D.N.A sample of Cleo. Dr. Denman finds the sample when Lewis carelessly leaves it in the lab, when he goes home for the day. Dr. Denman finds the sample and adds water to it. She then observes the cellular mutation of the sample. Dr. Denman persistently inquires Lewis about the sample. She writes a paper called "H2O: Just Add Water" which is presumably where the series gets its name. Lewis sees the article on her computer and erases it. Dr. Denman leaves town then reappears in the two part episode "Dr. Danger"/"A Twist in the Tail". Dr. Denman finds out the girls secret and traps them in the Moon Pool, planning to do some tests on them, Harrison Bennett helps her but wants no harm to come to the girls. Zane frees them, with the help of Lewis, but the girls come back to the island to give up their powers during the Lunar Eclipse. The girls only lose their powers temporarily for 12 hours, but Dr. Denman believed it to be forever and gives up. Dr. Denman is never seen or again mentioned in the series. She is the primary villain of Season 1.

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