The definitive story of The Hangover Trilogy: Including Zach's unlikely audition as "Alan," the truth behind Ed Helms missing tooth, the casting of a drug-dealing monkey and the wildly improbable rendezvous with a former president.

The definitive story of The Hangover Trilogy: Including Zach's unlikely audition as "Alan," the truth behind Ed Helms missing tooth, the casting of a drug-dealing monkey and the wildly improbable rendezvous with a former president.

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Main Cast: Todd Phillips, Bradley Cooper, Ed Helms, Zach Galifianakis, Daniel Goldberg, Jeremy Garelick, Sue Kroll, Justin Bartha, Bill Brzeski, Heather Graham

Director: Joseph Garner

Writer:

Editor: Wes Rubinstein

Cinematographer:

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