‘The Hangover Part III’ trailer: The boys return to Sin City

“The Hangover Part III” trailer promises plenty of mayhem as we see the return of Bradley Cooper, Zach Galifianakis, Ed Helms and Ken Jeong for the final installment of Todd Phillips’ trilogy.

The latest trailer includes very few lines of dialogue and only hints at the plot: Revenge on Sin City. The teaser dramatically opens with Cooper and Helms’ characters -- Phil and Stu, respectively -- attending a funeral, which showcases a moving “Ave Maria” solo from Galifianakis’ Alan.

“My God. He’s got the voice of an angel,” Phil says.

“It’s breathtaking,” Stu replies.

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Later in the trailer, we learn that the funeral is for Alan’s father, played by Jeffrey Tambor. Or so a portrait of him in front of a casket leads us to believe. You never know with these guys.

Absent from the trailer is Justin Bartha, whose disappearing act gave us the premise to the original 2009 film, though this omission may have been deliberate. Bartha is slated to return for the third installment, as is Tambor, who is supposedly being eulogized...

“I told myself I would never come back,” Stu says as he and his pals return to Las Vegas after their failed romp in Bangkok (See: “The Hangover Part II”).

“Don’t worry, it all ends tonight,” Phil says. What ends? We’re not sure. But judging from one of the film’s first official posters, we expect to see an epic throw-down between Galifianakis’ Alan and Ken Jeong’s Mr. Chow -- Harry Potter and Lord Voldemort-style. Another poster on the film’s Facebook page shows the Las Vegas Strip in flames.

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“Someone needs to burn this place to the ground,” Stu replies.

But it isn’t all just drama here. Despite several very intense gun chases by masked men, a gunshot that propels a body into a pool and a highly disturbing scene featuring Alan licking a red lollipop before placing it in Melissa McCarthy’s mouth, there’s still plenty of humor to be found.

“My name’s Alan and I bought a giraffe. My life is great!” he shouts while driving toward a freeway underpass with said giraffe in a trailer behind his convertible. Well, looks as if they haven’t learned all that much about animal humor from that “Part II” capuchin monkey.

“This time, there’s no wedding. No bachelor party. What could go wrong, right?” the official synopsis reads. “But when the Wolfpack hits the road, all bets are off.”

Heather Graham and Mike Tyson will reprise their roles as well. John Goodman has also joined the film’s cast, reportedly playing a mob boss who serves as the film’s main villain. The all-out debauchery fest hits theaters May 24.

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