Watch the Explosive 'American Assassin' Teaser Trailer

Lionsgate and CBS Films have just launched the first official teaser for the upcoming American Assassin motion picture. Based on the late Vince Flynn's bestselling novel of the same name and directed by Michael Cuesta, the film centers upon a young counterterrorist operative named Mitch Rapp (played by Teen Wolf actor Dylan O'Brien). The two-minute clip starts off with Rapp, who is about to propose to his girlfriend during a tropical getaway, but everything turns for the worst when plainclothes ...