Summary

SPOILER ALARM!

Note: This are possible plots! Naught is sure!

The third Pirates film chronicles Will Turner's journey to "the end of the world", as he hopes to
save the soul of his deceased friend, Jack Sparrow, who was killed in the finale of Dead Man's Chest.
While there, he runs afoul of the Asian pirate Captain Sao Feng (Chow Yun-Fat), and later Jack's
nemesis - the villianous Captain Barbossa (Geoffrey Rush) from the first movie.

source: wikipedia.com

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The age of piracy is coming to a close, but not before one final dispute is settled. Lord Cutler Beckett (Hollander), Davy Jones (Nighy) and Admiral James Norrington (Davenport) have formed a wicked alliance that threatens the freedom of Captain Jack Sparrow (Depp), Will Turner (Bloom), Elizabeth Swann (Knightley) and their new friend Captain Barbossa (Rush). Emerging victorious requires that the Jack lead his crew off the edge of the map and into uncharted territory on the seven seas.

source: movies.go.com