Doug wants to marry his girlfriend Tracy in 48 hours, but before then with his friends Phil and Stu are celebrated in Las Vegas. Moreover, it is his future brother Alan. With the Mercedes of Alan's father Sid begins the tour. In Hoel arrived, Alan gets the Jägermeister out of his pocket and it is triggered. The next day, Phil, Stu and Alan wake up in a hotel room on but there is no trace of Doug. That's not the worst, because the three have no recollection. They do everything to Doug as soon as possible to find and to go with him back to Los Angeles, where the wedding is already waiting for him.