In case you missed the second trailer for Lionsgate's American Ultra that debuted earlier this month, the studio has released a third trailer, chocked full of action. Before he takes on the villainous role of Lex Luthor in Batman v Superman: Dawn of Justice, Jesse Eisenberg portrays Mike Howell, a convenience store employee who is in for quite a rude awakening. After he becomes "activated," without even knowing it himself, Mike's incredible skills are put to the test.

American Ultra is a fast-paced action comedy about Mike (Jesse Eisenberg), a seemingly hapless and unmotivated stoner whose small-town life with his live-in girlfriend, Phoebe (Kristen Stewart), is suddenly turned upside down. Unbeknownst to him, Mike is actually a highly trained, lethal sleeper agent. In the blink of an eye, as his secret past comes back to haunt him, Mike is thrust into the middle of a deadly government operation and is forced to summon his inner action-hero in order to survive.

Walton Goggins, Topher Grace, Connie Britton, John Leguizamo, Bill Pullman, Tony Hale and Monique Ganderton round out the supporting cast in this action comedy from Lionsgate. While the movie itself didn't have an official presence at Comic-Con earlier this month, they did hand out free weed to anyone with a medical marijuana card from the state of California, along with new posters. We'll have to wait a few weeks to see if this free weed promotion will get enough fans excited for the movie.

When it hits theaters on August 21, American Ultra will go up against Sinister 2 and Hitman: Agent 47 in wide release next month. While both of those movies are set within existing franchises, American Ultra is the last comedy of the summer movie season, so we'll have to see if fans prefer to end their summer with big laughs, big scares or big action set pieces. Nima Nourizadeh (Project X) directs American Ultra, which was written by Max Landis (Chronicle).

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Check out the latest trailer from American Ultra, that proves even stoners can get in on the action. Do you think this action comedy could be the last big hit of the summer? Or will it crash and burn in the sweltering summer heat? Let us know what you think after checking out the latest footage from American Ultra.