Two days before his wedding, Doug travels to Las Vegas with his best friends Phil and Stu, and his future brother-in-law Alan, for a memorable bachelor party they hope to never forget. They check into a luxury hotel and head to the rooftop to celebrate. The night kicks off with a toast, and from there, the evening spirals into an unforgettable blur of events. The camaraderie among the group sets the stage for what promises to be an epic adventure in Sin City. However, the excitement of the city and the promise of a wild night takes a turn they could never have anticipated.

The next morning, the trio wakes up in their trashed hotel suite, with no memory of the night's events and Doug nowhere to be found. With the wedding just hours away, they must piece together the events of the night before to find Doug and get him back to Los Angeles in time for his wedding. Their journey to locate their missing friend leads them through a series of bizarre and often hilarious situations. Encounters with a police cruiser, a tiger in the bathroom, and a baby in the closet are just the beginning of their troubles as they attempt to retrace their steps and make sense of the chaos of the night before, all while dealing with the consequences of their actions.