Syrena was first introduced in Pirates of the Caribbean: On Stranger Tides. Syrena was a beautiful and alluring young mermaid. She was one of many who were involved in the quest for the Fountain of Youth. Not much is known about Syrena's early life. Syrena wasn't a typical mermaid, while the other mermaids are quite dangerous, she was rather timid. During Jack Sparrow's search for the Fountain of Youth, she was kidnapped by the Crew of the Queen Anne's Revenge on Blackbeard's orders, as they need a mermaid's tear in order to make the Fountain work. At some point during the search, Syrena fell deeply in love with a young missionary named Philip Swift, who also served as Blackbeard's captured slave.