Hey, stranger! Dylan O'Brien just tweeted to his 4.6 million followers for the first time since October 2016, to promote the trailer for his upcoming movie "American Assassin."

You may recall how, last year around this time, O'Brien was recovering from serious injuries suffered on the set of "Maze Runner: The Death Cure." In May 2016, it was reported that O'Brien was set to play Mitch Rapp in "American Assassin," based on Vince Flynn's bestselling series, with Michael Keaton as co-star.

Fast-forward to today, and O'Brien broke his Twitter silence to tweet this teaser for the "American Assassin" trailer:

Most of the replies are just fans expressing shock that he actually tweeted. As Teen Vogue noted, O'Brien has been "pretty MIA" since his "Maze Runner" accident, and he was nowhere to be found when the "Teen Wolf" cast got together to celebrate the show's 100th episode milestone. However, it's likely he just had a scheduling conflict with "Maze Runner," which halted filming after O'Brien's injury, but is now back in action and expected to be released January 12, 2018.

Anyway, the full trailer for "American Assassin" is now out: Here's the film's synopsis, from CBS Films:

"AMERICAN ASSASSIN follows the rise of Mitch Rapp (Dylan O'Brien), a CIA black ops recruit under the instruction of Cold War veteran Stan Hurley (Michael Keaton). The pair is then enlisted by CIA Deputy Director Irene Kennedy (Sanaa Lathan) to investigate a wave of apparently random attacks on both military and civilian targets. Together the three discover a pattern in the violence leading them to a joint mission with a lethal Turkish agent (Shiva Negar) to stop a mysterious operative (Taylor Kitsch) intent on starting a World War in the Middle East."

The movie, potentially the first of a series, is scheduled for release in theaters on September 15.

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