What's 'The Hangover Part III' Actually About?

Last month we got a taste of what The Hangover Part III had in store for fans, but today it's all become clear as the actual storyline for the series' conclusion has been revealed.

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After Alan's dad dies, he goes off the deep end, forcing Stu, Phil and Doug to send their buddy to rehab. But on the way the foursome is hijacked by John Goodman's character, who is looking for Mr. Chow (played by Ken Jeong) and forces the boys to return to Las Vegas. 

Watch all the madness unfold and check out The Hangover Part III in theaters on Memorial Day.