It's Alan vs. Chow in the first 'The Hangover Part III' poster

Oh, Warner Bros., you sly dogs! Evoking imagery from their famed Harry Potter franchise, specifically the final battle between Harry and Voldemort, the first poster for The Hangover Part III teases an epic clash between Zach Galifianakis and Ken Jeong.

Other than a handful of images, we haven't seen much from the film, but that should change tomorrow when the trailer debuts. With a tagline ominously stating "It All Ends", the poster all but confirms previous reports that Lesley Chow will play an expanded role in the film, apparently kicking off some sort of war with Alan that could destroy Las Vegas. The story has been kept mostly under wraps, although Todd Phillips has said Alan will be dealing with the death of his father, and will spend at least some time in a mental ward in Tijuana.

Also starring Bradley Cooper, Ed Helms, Heather Graham, Justin Bartha, John Goodman, Jamie Chung, Mike Epps, Mike Tyson, Jeffrey Tambor and Melissa McCarthy, The Hangover Part III opens on May 24th.