Movie where mer people are at war with mankind

Black Manta seeks revenge on Aquaman for his father's death. Wielding the Black Trident's power, he becomes a formidable foe. To defend Atlantis, Arthur (Aquaman) forges an alliance with his imprisoned brother. They must protect the kingdom.

Aquaman must battle foes in the air, on land and in the depths of the Seven Seas, along with some help from The Justice League, to save the day.

An other-worldly story, set against the backdrop of Cold War era America circa 1962, where a mute janitor working at a lab falls in love with an amphibious man being held captive there and devises a plan to help him escape.

An American couple, Paul and Marianne, spend their vacation in Italy and experience trouble when Marianne invites a former lover and his teenage daughter to visit, which leads to jealousy and dangerous sexual scenarios.

A successful businessman falls in love with the girl of his dreams. There's one big complication though; he's fallen hook, line and sinker for a mermaid.

Barbie stars as Merliah, a surfer who learns a shocking secret: she's a mermaid! She and her dolphin friend set out for an undersea adventure to rescue her mother, the queen of Oceana.

A mermaid is ripped from the Pacific, her tail is chopped off and she's thrown into a mental home where no one believes she is a mermaid.

On the coast of Cork, Syracuse is a divorced fisherman who has stopped drinking. His precocious daughter Annie has failing kidneys. One day, he finds a nearly-drowned young woman in his net; she calls herself Ondine and wants no one to see her. He puts her up in an isolated cottage that was his mother's. Annie discovers Ondine's presence and believes she is a selkie, a seal that turns human while on land. Syracuse is afraid to hope again.

When a fearsome and ancient species emerges from the ocean, dramatically revealing themselves to humanity, an international crisis is triggered. With the entire population at risk, UNIT step into action as the land and sea wage war.