Two days before his wedding with the rich Tracy Garner, traveling Doug Billings at his bachelor party in Las Vegas with his best friends, school, Phil Wenneck and dentist Stu Price, and Tracy’s brother Alan Garner unconventional. Tracy’s father lends his Mercedez Benz convertible, which is his pride and joy Doug with many recommendations. The Quartet takes the best suite at Caesars Palace and goes on the roof to celebrate. Alan proposes a toast to Doug and his drink alcohol. The next morning, Phil, Stu, and Alan have a hangover and do not remember what they did last night; The room on the head; Doug is missing; There’s a baby in the closet; a tiger in the bedroom; a chicken in the room; Stu has a missing tooth; and Doug is missing. The trio tries to track last night to find out what happened and as soon as they learn that Stu married stripper Jade (Heather Graham) and Alan has his drink with “Good morning, Cinderella”, spiked, early in their crazy night.