By answering a seemingly impossible riddle, Perseus, the son of Zeus, wins the hand of the Princess Andromeda in marriage. Trouble appears in the shape of Calibos, the princess’s former love, and his mother, the Goddess Thetis. In order that the dreaded Kraken not be released, Andromeda has to be sacrificed and Perseus searches for the Medusa; her head is the only thing that can stop the Kraken.

Just before their wedding, Elizabeth Swann and Will Turner are arrested by Lord Cutler Beckett for helping the pirate Captain Jack Sparrow, but Cutler proposes a deal to Will: their freedom per Jack’s compass. Meanwhile, Jack is afraid of the sea, because he owes his soul to the evil Davy Jones, the Captain of the Flying Dutchmen. When Will meets Jack, the pirate proposes to exchange his compass by a key owned by Davy Jones. Will goes to the Flying Dutchman without knowing how dangerous and diabolic Davy Jones and his crew are.

Having to leave Melbourne in a hurry to avoid various marriage proposals, two song-and-dance men sign on for work as divers. This takes them to an idyllic island on the way to Bali where they vie with each other for the favours of Princess Lala. The hazardous dive produces a chest of priceless jewels which arouses the less romantic interest of some shady locals.

A gang of jewel thieves board an empty luxury liner in the South Seas to find that the crew and passengers have been killed by a monster that kills its victims and sucks the water from their bodies that looks like a mix of a giant squid and the monster from “Aliens”.

In 1840, there’s work on the Florida Keys for honest salvagers (like the Claibornes) and outright pirates like King Cutler, who bribes sailors to cause wrecks. When Capt. Stuart’s ship is wrecked, Loxi Claiborne rescues him, falls for him, and travels to Charleston to convince the owners the wreck wasn’t his fault; company lawyer Steve Tolliver returns with them to Key West to investigate. Tolliver and Stuart’s rivalry for Loxi’s hand complicates their swashbuckling adventures in pursuit of Cutler, ending in a trial and a dangerous dive for evidence.

After Elizabeth, Will, and Captain Barbossa rescue Captain Jack Sparrow from the the land of the dead, they must face their foes, Davy Jones and Lord Cutler Beckett. Beckett, now with control of Jones’ heart, forms a dark alliance with him in order to rule the seas and wipe out the last of the Pirates. Now, Jack, Barbossa, Will, Elizabeth, Tia Dalma, and crew must call the Pirate Lords from the four corners of the globe, including the infamous Sao Feng, to gathering. The Pirate Lords want to release the goddess Calypso, Davy Jones’s damned lover, from the trap they sent her to out of fear, in which the Pirate Lords must combine the 9 pieces that bound her by ritual to undo it and release her in hopes that she will help them fight. With this, all pirates will stand together and will make their final stand for freedom against Beckett, Jones, Norrington, the Flying Dutchman, and the entire East India Trading Company.