When it comes to movies themed around Christmas, there are an infinite number of heartwarming films and a surprising number of horror movies. But, unless you are among those who count Die Hard as a Christmas movie, there are almost no holiday action films, and even fewer where Santa Claus is the hero at the center of it.

That makes Violent Night a unicorn of a film, one in which Santa (David Harbour) is a disillusioned, drink-addled mess whom we first meet downing beers in a bar on Christmas Eve. After stumbling through house after house, complaining all the while about kids’ obsession with video games, he makes his way to the estate of Gertrude Lightstone (Beverly D’Angelo).

Instead of seeing a happy family, he encounters two jealous siblings and their families, and a coordinated attack by an outside group led by a man nicknamed Scrooge (John Leguizamo) looking to steal $300 million in cash. Somewhat reluctantly, Santa uses his holiday magic – and long untapped military experience – to take on the bad guys and ensure a merry Christmas for those who deserve it.

Written by Pat Casey and Josh Miller (the team behind the two Sonic the Hedgehog movies) and directed by Tommy Wirkola, the film more than lives up to its title, splattering much of its running time with enough blood to satisfy any hardcore action fan. The creative ways in which villains are killed or maimed are numerous, including a fantastic final death and an homage to Home Alone that’s only slightly more graphic than the sequences in that classic kids movie.

Photo by Allen Fraser/Universal Pictures

David Harbour in Violent Night.

It’s surprisingly easy to accept Santa Claus as a vengeance-seeking action hero. Harbour is clearly having a ball in the role, and because he plays Saint Nick as grizzled and grumpy, there’s no disconnect between the kindly version we know and love and this more intense one. He also gets the majority of the laugh lines in the film, with a good number (though less than expected) giving a fun twist on holiday clichés.

The problem with the film is that it can’t sustain the momentum of the Santa mayhem scenes. The filmmakers try to have it both ways, pairing ultra-violence with a (dysfunctional) family story, using a cute girl who still believes in Santa as the bond between the two tones. The lack of attention paid to the dialogue of the Lightstone family is glaringly evident, especially since all of their roles, with the exception of D’Angelo, are filled by relatively unknown actors.

Anytime Santa Claus is on the screen – which is less than you might think – the film works. But any other time, it’s clear that they’re just trying to come up with something – anything – for the characters to do until they can get back to Santa kicking ass. And most of the time, what they’ve come up with is so eye-rollingly stupid or poorly written that you wonder why they included it in the first place.

Harbour is the glue that keeps the film watchable, committing himself 100 percent to the idea of the role. He doesn’t go overboard with the typical Santa elements, and the fact that he looks different from your typical Santa Claus also helps with the believability factor. Almost no one else is worth mentioning, save for maybe Leah Brady, the aforementioned cute girl who shines amid the depravity.

The potential for an alternative holiday classic was there with Violent Night, but the filmmakers focused too much on balancing the film instead of delivering on what the concept promised. If there is a next time, they should just let go of the reins and let Santa Claus go completely loose.

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Violent Night opens in theaters on December 2.