The comedy sequel marks the last instalment in director Todd Phillips's comedy trilogy, with Bradley Cooper, Ed Helms and Zach Galifianakis embarking on a road trip after the death of Alan's father (Jeffrey Tambor).
The central trio also return to the scene of their notorious Las Vegas bachelor party from the first film.
Justin Bartha, Ken Jeong, Jamie Chung, Heather Graham and Mike Tyson will all reprise their characters from the series' previous films, while John Goodman and Melissa McCarthy are new cast additions.
The Hangover Part III will open in cinemas on May 24.
Photo gallery - 'The Hangover Part III' character posters: