Doug Billings (Justin Bartha) is getting married in three days. To celebrate, his two best friends—the cocky, confident Phil (Bradley Cooper) and the anxious, henpecked Stu (Ed Helms)—and his future brother-in-law, the socially odd Alan (Zach Galifianakis), take him to Las Vegas for a bachelor party.

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The next morning, the trio (Phil, Stu, and Alan) wake up in their trashed hotel suite at Caesar’s Palace. They have no memory of the night before. The bed is destroyed. There is a chicken walking around the room. A tiger is in the bathroom. And most importantly: Doug is missing.