Following last month's teaser, Warner Bros. has unveiled the official trailer for The Hangover Part III, the final chapter in the hard partying trilogy. The trailer sets up the basic premise of the film in short order: Alan (Zach Galifianakis) has buried his father and is off his meds, and his subsequent unraveling forces the rest of the Wolf Pack -- Phil (Bradley Cooper), Stu (Ed Helms) and Doug (Justin Bartha) -- to hold an intervention. En route to a treatment center, the guys are ambushed by a crime boss played by John Goodman, who plans to use the Wolf Pack to track down Ken Jeong's Mr. Chow. From there the action shifts to Tijuana, Mexico, before it finally lands where it all began -- in Las Vegas. Check out the trailer below, and look for The Hangover Part III to hit theaters on May 24th.