Overview
Mermaids is a 2003 television film directed by Ian Barry and starring Serah D'Laine, Nikita Ager and Australian model Erika Heynatz as a trio of mermaid sisters who band together to avenge their father's death. The film is also known in other languages as Sereias (Brazil), Três Sereias (Portugal), Mermaids - Las sirenas (Spain), Oi treis gorgones (Greece), Seireenisiskokset (Finland), Sirènes (France), Sirenas (Argentina and Mexico), Русалки (Bulgaria and Russia), Sirene (Croatia), Mořské panny (Czech Republic), and Morské panny (Slovakia).
Plot
Unscrupulous fisherman John Mallick and his assistant Carlo are fishing with soda bombs in open water to harvest coral reefs when they notice a large creature thrashing in the water, Mallick shoots it and discovers that it's a merman. They attempt to collect the body but the vessel is knocked by a powerful force. Mallick sees a figure in the water, pointing a trident at him and he and Carlo escape, without the body of the merman.
The figure is Diana, the merman's eldest daughter. She has superhuman strength and a magical trident that turns into a comb she can wear in her hair. Diana buries her father's body. Although she loathes humans, Diana ventures onto land for the first time to seek out her sisters Venus and June to help her find Mallick and justice for their father's murder.
From Wikipedia (CC BY-SA 4.0).