American Ultra (2015) delivers a unique blend of stoner comedy and high-octane action that keeps viewers entertained from start to finish. The film follows Mike Howell (Jesse Eisenberg), a seemingly ordinary convenience store clerk with anxiety issues who spends his days smoking weed and dreaming of proposing to his girlfriend Phoebe (Kristen Stewart). His mundane existence shatters when he discovers he's actually a highly trained CIA sleeper agent, now marked for elimination by the agency that created him.

Director Nima Nourizadeh crafts a surprisingly effective balance between laugh-out-loud comedy and brutal fight sequences. Eisenberg delivers one of his most physically committed performances, transitioning convincingly from hapless stoner to lethal weapon when his programming activates. Stewart provides solid support as the loyal girlfriend who proves more capable than she initially appears. The chemistry between the two leads, who previously starred together in Adventureland, adds genuine heart to the chaotic proceedings.

What makes American Ultra worth watching is its clever subversion of both action and stoner comedy tropes. The film takes its ridiculous premise seriously enough to deliver satisfying action while never losing its sense of humor. Supporting turns from Topher Grace as a smarmy CIA operative and Connie Britton as a sympathetic agent add depth to the government conspiracy elements. While the plot occasionally strains credibility, the film's energy and commitment to its bizarre concept make for an enjoyable 96-minute ride. For viewers seeking something different from standard action fare with genuine laughs and inventive fight choreography, American Ultra offers a high-concept thrill worth streaming online.