Anything goes in this genre-bending thrill ride, and that’s what makes “Overlord” so much fun.

“Overlord” is insane.

Just … insane.

It’s a World War II action film. AND it’s a sci-fi horror flick. It features a mad-scientist Nazi and Frankenstein’s-monster-type zombies, all blended into a typical war-movie mission in which GIs parachute behind enemy lines to take out a German-controlled radio tower.

Anything goes in this genre-bending thrill ride, and that’s what makes “Overlord” so much fun.

It’s just before D-Day, and the paratroopers are approaching their destination in German-occupied France when all hell breaks loose on their plane. And when it does, director Julius Avery (“Son of a Gun”) delivers a wild sequence of explosive mayhem so intense that you’re likely to blurt out “Holy bleep!” … or something on that order. Not your average action scene.

Not many of the soldiers survive, and those who do make their way to a village where the French residents are terrorized by their sadistic German oppressors. Private Boyce (Jovan Adepo), the story’s protagonist, who’s chided for his sensitivity, and three others (Wyatt Russell, son of Kurt Russell and Goldie Hawn; John Magaro and Iain De Caestecker) wind up hiding in the home of a Frenchwoman, Chloe (Mathilde Ollivier), her 8-year-old brother and her aunt.

The aunt is never seen. She’s behind closed doors, though the soldiers hear a horrific gurgling, wheezing sound. Chloe says the aunt is ill. No doubt about that, but it sure doesn’t sound like the common cold.

From Chloe’s home, the Americans plot to get into the tower to blow it up – a next to impossible task and likely a suicide mission. Boyce eventually does find his way inside, where he makes some truly bizarre, terrifying discoveries. That’s when things get really crazy.

Despite its seemingly random blend of genres, “Overlord” works as both an action-packed war flick with strong characters (Russell is especially good as an explosives expert and team leader who puts the success of the mission above all else) and a creepy, scary chiller that provides lots of suspense and the occasional jolt.

This is one weird, weird movie.