Hangover: They planned a Vegas bachelor party that they would never forget. Now they really need to remember what exactly went down. Hangover Part II: Two years after the bachelor party in Las Vegas, Phil, Stu, Alan, and Doug jet to Thailand for Stu's wedding. Stu's plan for a subdued pre-wedding brunch, however, goes seriously awry. Hangover Part III: The continuing misadventures of the Wolfpack. After the death of his father, Alan turns to the Wolfpack in his time of grief. This time, there's no wedding, no bachelor party, just one simple road trip. What could possibly go wrong?