The same cast of characters from the first two movies returns with the addition of several Pirate Lords played most notably by Chow Yun Fat and Keith Richards (in the role of Jack Sparrow's father, although I couldn't immediately tell a difference from his last Stones appearance, and I kept waiting for one of the other pirates to call him Keef). The story is a bit confusing as it consists of a meeting of the same Pirate Lords, the release of a mythical creature called Calypso, attempts to free Jack from Davy Jones Locker (the world of the dead?) and the battle(s) to gain control of the chest with Jones heart in it, control of the Black Pearl, control of the high seas, etc. I think there were at least three sides in the movie with the British Navy as one, Davy Jones & crew as another, and then the collection of the main characters as the third.
The problem is that at any given moment one group is in league with another, someone from one group betrays the others and crosses sides, etc. After awhile I gave up on understanding where the plot was supposed to be going and just enjoyed the action and humor. Johnny Depp just seems made for this character and he is consistently funny throughout. The action sequences and special effects are as good as they come and although the movie was little too long at 2:45, the time went by fairly fast. If you consider yourself a fan of the first two, it's worth seeing in the theater once. If you weren't, this won't win you over. I give it a mild thumbs up.