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).

Mallick sees a figure in the water, pointing a trident at him and he and Carlo escape, without the body of the merman.

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.

The middle sister Venus is working in a cafe where she swims in a tank with a fake mermaid tail.

When Diana finds her, she is appalled by her sister's behavior and suspects that there is another reason behind her choosing to perform for humans.

Diana forces Earl to give up the tiara and also finds a large seashell, the birthright of another mermaid.

Venus realizes that it belongs to Earl's middle-aged wife Betty who has forgotten her mermaid heritage.

Later, at the end of the film, Randy decides to marry his fiancée, Cynthia, as he does not know that June was the one who saved his life In this version of mermaid mythology, merpeople are magical creatures who gain legs when dry and a tail when wet, an idea that was made famous by the film Splash.

The three sisters in the film also have other magical abilities: Diana has super strength and Venus can hypnotize men to obey her.