‘Onslaught’ Review: Adam Wingard Delivers Desert Thrills but Falls Short on Execution

There’s a unique excitement in witnessing a director who has spent years managing massive budgets and epic monsters return to a more intimate, gritty, R-rated project. This is the vibe that ‘Onslaught’ brings, a trailer park siege film from Adam Wingard that swaps kaiju action for genetically engineered super soldiers lurking in the desert at night. Adria Arjona stars as Celeste, a sharpshooter who must fight for survival alongside her neighbors when a government experiment goes horribly awry.

The premise clearly pays homage to grindhouse cinema, reminiscent of the scrappy siege thrillers where a diverse community stands against an overwhelming threat while a corrupt institution observes from the shadows. Dan Stevens appears as the mad scientist behind the chaos, fully embracing an accent and a theatrical menace that feels like it belongs in a campier film. Michael Biehn, Eric Wareheim, and Reginald VelJohnson complete the trailer park cast, adding a gritty, authentic feel to the film, even when the script doesn’t do them many favors.

However, this is where my excitement begins to falter. ‘Onslaught’ spends nearly its entire first hour establishing the story, introducing conflicts, backstories, and government conspiracy elements that hint at a dark morality tale about institutional decay. Yet, when the climax finally arrives, it feels rushed, as if the film ran out of both time and ideas just as the fuse it spent an hour igniting was supposed to explode.

Arjona emerges as the film’s strongest asset, delivering a convincing performance in the action scenes and grounding a narrative that risks veering into self-parody. While Stevens seems to be enjoying himself, his performance contrasts with the grittier tone that the rest of the cast embodies, leading to a tonal imbalance that never fully resolves. Wingard’s direction retains its edge, particularly in several nighttime chase sequences that evoke the gritty, tactile menace of low-budget action films from the past, but the connections between these standout moments feel weaker than they should.

The supporting mercenary characters, including a towering, nearly mute super soldier who stands out as the film’s most memorable creation, suggest that a more focused and brutal film exists within this one. Instead, the plot meanders through too many competing narratives—family issues, shadowy military operations, and a scientist’s god complex—without fully realizing any of them. By the time the action ramps up, characters who seemed significant are quickly sidelined, and the film’s climax feels more like a letdown than a thrilling conclusion.

What prevents ‘Onslaught’ from completely falling apart is its dedication to raw, unapologetic violence and a self-aware humor about its pulpy nature. It knows what kind of film it aims to be, even if it doesn’t always manage to achieve that vision effectively. There’s likely a tighter, more impactful eighty-minute version of this film lurking in the editing room that could have delivered a stronger punch.

Ultimately, I left ‘Onslaught’ appreciating its ambitious spirit more than its execution. It’s a film with genuine bite that often forgets to deliver when it matters most. Arjona’s committed lead performance and a few genuinely tense moments keep it engaging, even as the plot falters and the resolution disappoints. My honest rating is 6.5 out of 10, marking it as a decent option for a midnight movie that never fully transforms into the fierce thriller its premise promised.

Have you seen ‘Onslaught’ in theaters yet? Did its slow-burn setup pay off for you in a way it didn’t for me? Share your thoughts in the comments.