A playboy business tycoon, Liu Xuan, purchases the Green Gulf, a wildlife reserve, for a sea reclamation project, and uses sonar technology to get rid of the sea life in the area. Unknown to him, the Green Gulf is the home of merpeople, and the sonar has caused many of them to succumb to illness or die. Xuan's business ventures in the area are threatened when he crosses paths with the mermaid, Shan, who is sent to avenge her people.
The checkered past of Capt. Jack Sparrow (Johnny Depp) catches up to him when he encounters Angelica (Penélope Cruz), a beautiful pirate that Jack once loved then left. Angelica forces him to accompany her to the Queen Anne's Revenge, the ship of the notorious Blackbeard (Ian McShane). Accompanied by a zombie crew, the trio sets sail to find the legendary Fountain of Youth. However, Jack's rival, Barbossa (Geoffrey Rush), also seeks the fountain, as does a ship from Spain.
The story of an Irish fisherman who discovers a woman in his fishing net who he believes to be a mermaid.
The superintendent of an apartment building, Cleveland Heep (Paul Giamatti), rescues a mysterious young woman (Bryce Dallas Howard) and discovers she is actually a narf, a character from a bedtime story who is trying to make the treacherous journey from our world back to hers. As Cleveland falls in love with the woman, he works together with the tenants to protect his new fragile friend from the deadly creatures that are determined to prevent her from returning home.
Following a violent storm, a beautiful and sassy mermaid named Aquamarine (Sara Paxton) washes ashore and into the lives of Claire (Emma Roberts) and Hailey (Joanna Levesque), two teenage girls. After Aquamarine falls for a local, hunky lifeguard, she enlists the girls’ help to win his heart.
A mermaid (Erika Heynatz) joins her sisters (Nikita Ager, Sarah Laine) on the land to track down their father's killer.
Two carnies (Sewell and Gugino) abduct a mermaid in Ireland, circa 1900, and decide to transport her to America. As their ship loses its way and heads towards the mythical Forbidden Islands, the mermaid begins to display its deadly side.