'The Hangover 2' Trailer Brings Action To Thailand (VIDEO)

And you thought Las Vegas was a trip.

The Wolf Pack is back in the first trailer for "The Hangover Part II," the followup to the hit 2009 drunk buddy comedy that launched its roofied players to superstardom.

The story remains much the same: Stu (Ed Helms), Phil (Bradley Cooper) and Alan (Zach Galifianakis) start a bachelor party, and then wake up with a wild animal, without a friend and absolutely no recollection of what was evidently a wild night. Except this time, they're in Thailand.

A large majority of the original cast returns, including Justin Bartha as Doug, who, try as he might, just cannot have any real fun. Ken Jeong, as Mr. Chow, also returns. It's not shown, but Liam Neeson makes a cameo in the film; he replaced Mel Gibson after a cast mutiny forced director Todd Phillips to drop him from the script. Mike Tyson, who had a surprise role in the first film, will be back in the sequel.

In February, Galifianakis spoke about filming in Thailand with Entertainment Tonight, saying, "I don't really want to go back because I find that I might be bored when I go back to the United States. This is, like, the most un-boring place. I just love it."

The film hits theaters on May 26th.