What happens when a hard-rock band witnesses a horrific crime inside a neo-Nazi bar? Well, let's just say it ain't pretty... but damn is it wildly entertaining.

The first red band (NSFW) trailer for Green Room has arrived online, teasing a fierce thriller about a bunch of kids who get stuck in the wrong place at the wrong time and must somehow find a way to escape before it's too late.

Check it out.

After Green Room had its United States premiere at Fantastic Fest, Jacob Hall wrote a great post about how the movie shows us a side of Patrick Stewart we've never really seen before: that of the unrelenting, unapologetic and yet disarmingly charming psychopath. Stewart isn't actually the main star of the movie, though. Those duties are somewhat split amongst the ensemble's younger cast, with Anton Yelchin, Imogen Poots and Alia Shawkat kind of anchoring things

Watching Green Room is like grabbing an electric fence. Your brain knows you need to release your grip, that you need to get away from this shocking thing, and yet the shock is so powerful that it paralyzes you in place and forces your body to ride it out. And what a ride it is.

Definitely circle this one on the release calendar, and we promise you genre freaks won't be disappointed. Green Room hits theaters on April 29.