Pirates of the Caribbean is the fourth film. In this part, Jack Sparrow was arrested to find the fountain of youth, and finding the fountain of youth requires the tears of mermaid, so the mermaid appeared in this part.

The mermaid caught in Pirates of the Caribbean 4 is called Selena. Selena is different from other mermaids. She has human feelings and is no longer a cold mermaid. It is Philip who changed Selena, and Selena also changed Philip. From the moment they first met, they felt deja vu about each other.

Introduction to Pirates of the Caribbean 4.

Pirates of the Caribbean 4 tells the story that Captain Jack was caught by King George II of England and ordered to look for the legendary "fountain of youth". He went with his old friend, Captain Barbossa, who had been accepted. However, the voyage got off to a bad start. Captain Jack met his old lover Angelica. He didn't know whether she really loved herself or was using him to find the "fountain of youth". However, Jack was forced to board her thief boat and go with her father to find the fountain of youth.