The last time you saw the Wolf Pack, they were in Las Vegas, trying to piece together the events that led to the disappearance of the groom-to-be. Their misadventures led to a strengthening of bonds, and they assured each other of one certainty - never again would they repeat the events of the night that they cannot remember.
2 years later, Alan (Zach Galifianakis) still has all the photographs of that night, but that is not important. What is important is that in The Hangover Part II, Stu (Ed Helms) is getting married to the woman of his dreams, Lauren (Jamie Chung), in ....