Back in December we were treated to the first full-length feature Pirates of the Caribbean: On Stranger Tides trailer. A series of posters, set photos, teasers and a Super Bowl spot later, we're beginning to get a fairly well-rounded idea of what's going on in the fourth installment of the Disney Pirates franchise.

The previous trailer and clips showed us the more humorous side to the movie including the winsome antics of Captain Jack Sparrow. This latest trailer, courtesy of Yahoo! movies seems to place the emphasis back on the action and adventure, where it needs to be. And is much darker too.

You can enjoy the trailer below or head over to Yahoo! Movies to see it in HD.

Pirates of the Caribbean: On Stranger Tides is scheduled for a May 20, 2011 release, is directed by Rob Marshall and stars Johnny Depp; Geoffrey Rush; Penelope Cruz; Judi Dench

Synopsis: Jack Sparrow and Barbossa embark on a quest to find the elusive fountain of youth, only to discover that Blackbeard and his daughter are after it too.