Alan (Zach Galifianakis) is 42 years old, but still lives with his parents. One day his father is "finally" angry with him. Several of Alan's best friends Phil (Bradley Cooper), Stu (Ed Helms) and Doug (Justin Bartha) decide to take Alan to a place in Arizona to provide him with psychological treatment. Four people were accidentally kidnapped on the road by a man named Marshall. It turns out that all this is the fault of Leslie Chow (Ken Jeong). Chow escaped from prison in Bangkok and stole half of Marshall's 42 million worth of gold. In order to find Chow, Marshall left Doug behind and asked the other three to bring Chow back. Alan has been in contact with Chow, and the three of them soon met with Chow. In order to save Doug, Chow decided to bring...