Imagine Viggo Mortensen in “A History of Violence” meets Jason Bourne meets a ton of weed. What do you get? Jesse Eisenberg’s Mike Howell in “American Ultra.”

In the action comedy from writer Max Landis (“Chronicle”) and director Nima Nourizadeh (“Project X”), Mike is a “stoned cold killer” who doesn’t even know it. When a government agent (Connie Britton) shows up to warn him of a dangerous operation, he has no clue what she’s talking about, unable to remember that he’s actually a trained killer. After a bunch of bad guys attack him, Mike goes on the run with his stoner girlfriend (Kristen Stewart). “American Ultra” also stars Topher Grace and John Leguizamo.

“American Ultra” opens Aug. 21.

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