By Clark Collis
Updated August 28, 2014 at 10:02 PM EDT
The Guest
Credit: Ursula Coyote

What has actor Dan Stevens been doing since he left Downton Abbey? Beating up high school kids! That, at least, is what the actor formerly known as Matthew Crawley is doing in a new clip from his film The Guest, which arrives in cinemas September 17.

This twisty action-thriller-cum-black comedy from the You’re Next creative team of director Adam Wingard and writer Simon Barrett stars Stevens as a war vet who worms his way into the good graces of a bereaved family and tries to solve their problems with extreme prejudice.

You can check out both the new clip from The Guest and the film’s trailer below.