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An R-rated horror action comedy fairytale — how's that for genre bending?

"Hansel & Gretel: Witch Hunters" is more Gatling guns and grenades than the Brothers Grimm. It takes the kidnapped kiddies into adulthood, where they've parlayed their fame at cooking a witch's goose into a business. Got a witch problem? Call H & G — the extermination experts.

High-concept pitch or no, the movie doesn't really work. They were shooting for sort of a witch-hunting "Zombieland," an f-bomb-riddled "Van Helsing" packed with comical anachronisms — a Bavarian forest past with witch trials, shotguns and primitive tasers, where bottles of milk have woodcut pictures of "missing children" on the labels.

Hansel (Jeremy Renner) and Gretel (Gemma Arterton) show up just as the village of Augsburg is about to burn a redhead. "Gingers" were a favorite target of witch hunters. Hansel shrugs off this barbaric crime, but Gretel insists that the locals need "evidence." That puts them in conflict with the sheriff (Peter Stormare).

Soon enough, the siblings are on the job, chasing lesser witches in pursuit of the Great Witch, played by Famke Janssen as if the makeup is going to do all the acting for her.

Hansel and Gretel have a groupie (Thomas Mann), and the woman (Pihla Viitala) they saved from burning in the opening scene wants to return the favor to Hansel, a repayment that involves skinny dipping. And when they're on the clock, they have all manner of clever gear to help them battle the wand-wielders — pistols, rifles, a semi-automatic crossbow, the aforementioned taser (hand-cranked).

Writer-director Tommy Wirkola flings all manner of viscera at the 3-D camera as limbs are whacked off and heads and torsos explode. Less attention was paid to the story.

The cleverest touch? Hansel's mania for candy-covered houses is what landed Hansel and Gretel in that witch's clutches, all those years ago. Now, he carries an ancient hypodermic needle and takes injections to ward off insulin shock.

The moral of the fairytale? Lay off the candy or a witch will get you.