Phil (Bradley Cooper), Stu (Ed Helms), Alan (Zach Galifianakis) and Doug (Justin Bartha) travel to exotic Thailand for Stu’s wedding. After the unforgettable bachelor party in Las Vegas, Stu is taking no chances and has opted for a safe, subdued pre-wedding brunch. However, things don’t always go as planned. A source familiar with the production said the character of the tattoo artist (played by Liam Neeson) is “pivotal” to the plot, in which one of the stars gets a tattoo during a night of debauchery.