Old School helmer Todd Phillips is back with another tale of overgrown adolescents on the rampage in The Hangover – and you can watch the new trailer below.

This time out, we follow a group of friends – including The US Office’s Ed Helms, Wedding Crashers’ Bradley Cooper and National Treasure’s Justin Bartha, who arrive in Vegas for Bartha’s stag bash.

Along for the ride is Bartha’s soon-to-be brother-in-law, played by comedian Zach Galifianakis, who looks to finally break out, Will Ferrell style with the pic.

The men drink to excess and enjoy everything Vegas has to offer, but when they awaken the next morning and discover A) Bartha missing and B) that they have no idea what happened or where he is, a desperate hunt begins for the missing groom. Who just happens to be due at the altar in a few hours..

Oh, and there’s the small matter of the missing tooth, the baby and the mysterious marriage.

We’ve got to admit we chuckled several times at the footage and are hopeful that this marks a return to form for Phillips. Helms, Cooper and even Bartha can be reliable laugh-grabbers and the concept’s just fun enough to work.

But enough introduction – watch the promo and decide for yourself.