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After a failed attempt to rescue his first mate, Joshamee Gibbs in London, Captain Jack Sparrow is brought before King George II. The king wants Jack to guide an expedition to the Fountain of Youth before King Ferdinand and the Spanish Navy can locate it. Jack's old nemesis, Captain Hector Barbossa, now a privateer in service to the British Navy after losing his leg and ship, the Black Pearl, which he says was sunk, is heading the expedition.
Jack refuses the offer and escapes. He meets up with his father, Captain Teague, who warns Jack about the Fountain's rituals. Jack learns someone is impersonating him to recruit a crew to find the Fountain. The impostor is Angelica, Jack's former lover, and the daughter of the ruthless pirate Blackbeard, who practices voodoo magic and wields the mythical "Sword of Triton" that controls his ship, the Queen Anne's Revenge. While Jack is shanghaied aboard Blackbeard's ship, Gibbs escapes execution by memorizing and destroying Jack's map showing the Fountain's location, forcing Barbossa to take him along.
Meanwhile, after a failed mutiny aboard the Queen Anne's Revenge, Jack is forced to guide the crew to the Fountain. Blackbeard seeks the Fountain's power to circumvent his predestined fatal encounter with a "one-legged man", who happened to be Barbossa. Jack must find two silver chalices aboard Juan Ponce de León's missing flagship, theSantiago. The Fountain's water must simultaneously be drunk by two people from the chalices. Drinking from one chalice containing a mermaid's tear will extend life; the second person dies, their remaining years of life transferred to the other drinker. Jack also discovers that the Black Pearl was captured and shrunk before being added to Blackbeard's collection of other shrunken ships in bottles.
The Queen Anne's Revenge heads for Whitecap Bay to find and harvest mermaid tears. A mermaid named Syrena is caught, but Philip Swift, a captive missionary, falls in love with her. Reaching Ponce de León's ship on an uncharted island, Angelica and Blackbeard coerce Jack into retrieving both chalices. Jack locates the grounded, decaying vessel, only to find Barbossa there. Both claim that the Spanish have taken the chalices, after it was nowhere to be found on the vessel.
Jack and Barbossa team up to sneak into the Spanish camp and steal the chalices. Barbossa reveals he only wants revenge against Blackbeard for attacking the Black Pearl, and his leg being amputated. Jack and Barbossa escape with the chalices. Meanwhile, Syrena, reciprocating Philip's love, is tricked into shedding a tear. Blackbeard collects it, leaving her to die while Philip is forced to go with them. Jack returns with the chalices and bargains with Blackbeard for Angelica's safety, Jack's confiscated magical compass, and Gibbs' release. In return, Jack vows to give Blackbeard the chalices and lead him to the Fountain; Blackbeard agrees, and Gibbs is set free with the compass.
At the Fountain, Blackbeard's crew are confronted by Barbossa and his men and they battle while Barbossa and Blackbeard fight. The Spanish suddenly arrive, intending to destroy the Fountain, believing its power an abomination against God. When Barbossa stabs Blackbeard with a poisoned sword, Angelica pulls it out but is cut and poisoned. Barbossa obtains Blackbeard's magic sword and gains control of the Queen Anne's Revenge and her crew. Philip is mortally wounded, but he returns to free Syrena. She retrieves the missing chalices and gives them to Jack, telling him not to waste her tear. Syrena goes back to the dying Philip. She says she can save him if he asks her to. When he asks for her forgiveness, she takes him underwater.
With Blackbeard and Angelica both nearing death, Jack wants Angelica to drink from the chalice containing the tear. Instead, Blackbeard drinks it, asking his daughter to sacrifice herself. Angelica agrees and drinks from the second chalice. Anticipating that the self-serving Blackbeard would sacrifice his daughter, Jack lied about which chalice contained the tear to save Angelica's life and Blackbeard's soul. Angelica's wounds are healed as the Fountain fatally consumes Blackbeard's body. Although Angelica claimed she loves Jack, he distrusts her intentions and strands her on a cay. Now wielding Blackbeard's magical sword, Barbossa captains the Queen Anne's Revenge and returns to piracy.
Jack finds Gibbs, who had used the compass to locate the Revenge. He reclaimed the shrunken Black Pearl and the other conquered ships in bottles, carrying them in a gunny sack. The two leave, hoping to revert the Black Pearl to its original size.
In a post-credits scene, a voodoo doll of Jack crafted by Blackbeard washes ashore and is found by grinning Angelica.
