Behind the Scenes of 'The Hangover Part III'

The Wolfpack is back: This time, there's no wedding, no bachelor party -- what could go wrong, right? We're with the returning stars of The Hangover Part III – including Bradley Cooper, Ed Helms, Zack Galifianakis and Ken Jeong – as they detail just how crazy the final chapter of the hilarious franchise gets.

Pics: Epic Hangover Part 3 Poster and More

In theaters May 24, the epic conclusion to an incomparable odyssey of mayhem and bad decisions finds Phil (Cooper), Stu (Helms) and Doug (Justin Bartha) happily living uneventful lives at home. Tattoos have been lasered off, files purged. The last they heard from disaster-magnet Leslie Chow (Jeong), he'd been tossed into a Thai prison and, with him out of the way, the guys have very nearly recovered from their nights prowling the seamy side of Las Vegas in a roofie'd haze, and being kidnapped, shot at, and chased by drug-dealing mobsters in Bangkok.

Video: Watch The Hangover Part III Trailer

Alan (Galifianakis), still lacking a sense of purpose, has ditched his meds and given into his natural impulses in a big way. A personal crisis forces him to finally seek the help he needs, and who better than his three best friends to make sure he takes the first step? But when the Wolfpack hits the road, all bets are off as the guys must finish what they started by going back to where it all began: Las Vegas.