Kristen Stewart and Jesse Eisenberg dress down and cover themselves with bruises, fake-cuts and gore for the ultra violent “American Ultra.”

And if they don’t cover themselves in glory, at least these reunited “Adventureland” co-stars do justice to this testicles-on-the-tarmac B-movie. A gonzo, goofy riff on “I was raised to be a CIA killing machine, but don’t know it” formula (see “Bourne, Jason”), it packages both stars in ways they’ve never been presented before.

Mike (Eisenberg) loves Phoebe (Stewart). They eke out blue collar lives in their little corner of West Virginia. Mike is forgetful, clumsy and given to panic attacks. That ruins his plans to take Phoebe to Hawaii and propose to her there. Phoebe is WAY more understanding of all this than somebody who looks like Kristen Stewart should be. But hey, “love.” Or the marijuana that keeps them both blissed and quasi-philosophical as he scribbles at “Apollo Ape-Man,” a comic he wants to launch while working at an all-night convenience store and she answers phones at a bail bondsman’s office.

That abortive airline flight sets in motion events that have Mike, covered in stitches and bodily fluids, sitting in an interrogation room being debriefed a few days later. It seems his near-leaving has triggered “Tough Guy,” an agency operation, to come in and hurl assassins at him, two-by-two.

And Mike, as the opening scene shows us, handles those killers. Sometimes with a spoon or an instant noodles cup, sometimes with a dustpan.

The director of “Project X” foreshadows the terrors and laughs of this long, bloody night in West Virginia, running through them in high-speed reversed footage before showing us the actual brawls and predicaments. The screenwriter of “Chronicle” keeps the stoner logic intact (Mike’s dorky way of listening to the people who are trying to kill him, before fighting back).

Mike is warned by his control agent (the omnipresent Connie Britton).

“Echo Choir has been breached. We are fielding the ball.”  Say what?

When the rhymes-with-whit goes down, the only guy Mike can turn to is his pot dealer, hilariously interpreted by John Leguizamo. “Rose” is a rural town’s idea of a drug lord — dropping the “N-word” too freely, swaggering through sales of fireworks and pot as if he’s Scarface.

Topher Grace is the crazed CIA officer who wants to erase this young guy from the books. And Bill Pullman, channeling his old pal Robert Loggia, is the gruff Old Man of the Service who shows up to shake his head and try to tidy things up after it all goes haywire.

Stewart submits to a blacklight fight and chase scene (nobody looks good in black light), Eisenberg wears his hair long (perhaps to disguise stunt men filling in on the fights) and hides his intelligence when he needs to.

“There’s a chance I might be a robot.”

Hang the logic of it all, don’t overthink and try to forget how feminine Eisenberg looks, even in his toughest moments — watch the way Mike holds a cigarette. It’s an August movie, as in “We can’t make any money off it in the middle of summer, and it’ll get lost in the fall.” But Eisenberg and Stewart and Leguizamo and Grace get into the spirit of the thing and give it the old community college try.

It”s fun in a bad way and bad in a fun way, and that’ll do for this late in the summer.

MPAA Rating: R for strong bloody violence, language throughout, drug use and some sexual content

Cast: Jesse Eisenberg, Kristen Stewart, Connie Britton, Topher Grace, Bill Pullman
Credits: Directed by Nima Nourizadeh , script by Max Landis. A Lionsgate release.

Running time: 1:35