The Hangover is a 2009 comedy film directed by Todd Phillips, written by Jon Lucas and produced by Todd Phillips and Daniel Goldberg. The movie was made for Warner Bros. Productions and made by Legendary Pictures. The film stars Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha, and Heather Graham.
The main plot follows four friends who travel to Las Vegas for a bachelor party, only to wake up the next morning not remembering a thing and missing the groom, whose wedding is scheduled to occur the next day. The film was released in North America on June 5, 2009, to critical praise and box office success.
Doug (Justin Bartha) is about to be married to Tracy (Sasha Barrese), and his friends — Phil (Bradley Cooper), Stu (Ed Helms), and soon-to-be brother-in-law Alan (Zach Galifianakis) — take him to Las Vegas for a bachelor party. Tracy’s father lends them his car, a vintage Mercedes convertible for the trip. The four get a villa at Caesars Palace hotel and casino, then sneak onto the roof and toast to the night ahead. The next morning, the three groomsmen wake up in the suite with no memory of the previous night, and realize that Doug is missing. Clues abound: the suite is in severe disorder, a tiger is in the bathroom, a baby is in the closet, Stu is missing a tooth, one of the suite’s mattresses is impaled on a statue outside, Phil is wearing a hospital bracelet, Stu has an $800 ATM receipt, and a valet brings them a stolen police cruiser they dropped off the night before.
While retracing their steps, a doctor at the hospital informs them that they had traces of roofies in their blood, explaining their memory loss, and that they came from a wedding. They find the chapel, and learn that Stu, despite planning to propose to his controlling girlfriend Melissa, married a stripper named Jade (Heather Graham), the mother of the baby in the closet. On the parking lot, they escape an attack by two armed Asian gangsters who beat up the police car yelling “where is he?”. Confused, the men visit Jade’s apartment and return the baby, but are taken by surprise and arrested for stealing the police cruiser. Phil negotiates their release in exchange for the three groomsmen “volunteering” as targets for a taser demonstration. They then retrieve the Mercedes from an impound lot and discover a naked Asian man in the trunk. The man attacks them and runs away, and Alan admits to spiking their drinks the night before with what he thought was ecstasy, but realizes the drug dealer must have sold him roofies instead. They return to the hotel and find former boxing champion Mike Tyson in their room, who was looking for his stolen tiger. Tyson knocks out Alan and orders them to return the pet to his mansion. They drug the tiger with roofies and transport it in the Mercedes, but before they reach Tyson’s mansion, it wakes up and destroys the car’s interior. Tyson plays security footage of the groomsmen’s activities from the night before in an effort to help them locate Doug.